PSU 20-76 - Power Supply GW Instek - Free user manual and instructions

Type of Product	Programmable DC Power Supply
Model	PSU 20-76
Rated Output Voltage	20 V
Rated Output Current	76 A
Rated Output Power	1520 W
Dimensions (W×H×D)	423 × 43.6 × 447.2 mm
Weight (main unit only)	Less than 8.7 kg
AC Input Voltage Range	85 Vac to 265 Vac
AC Input Frequency	47 Hz to 63 Hz
Maximum Input Current (at 100 Vac)	21 A
Maximum Input Current (at 200 Vac)	11 A
Operating Temperature	0°C to 50°C
Storage Temperature	-25°C to 70°C
Operating Humidity	20% to 85% RH (non-condensing)
Protection Features	OVP, OCP, UVL, OHP, AC Fail, Fan Fail, Sense Alarm, Hardware OVP
Interfaces	RS-232, RS-485, LAN, USB (CDC); optional GPIB, Isolated Analog
Parallel Operation	Up to 4 units, master-slave with active current sharing
Series Operation	Up to 2 units (same model)
Remote Sense	Compensates voltage drop up to 1 V (single wire)
Bleeder Control	On/Off configurable; default ON
Internal Resistance Setting	0.000 to 0.263 Ω (adjustable)
Maintenance & Cleaning	Disconnect power; use soft damp cloth with mild detergent; no harsh chemicals
Safety Compliance	EN 61010-1, EN 61010-2-030; CE marked; Pollution Degree 2, Measurement Category II
Spare Parts & Repairability	Calibration every 2 years by authorized service center; optional cables and bus bars available

Frequently Asked Questions - PSU 20-76 GW Instek

How often should the PSU 20-76 be calibrated?

The power supply should be calibrated by an authorized service center at least every 2 years. For details, contact your local dealer or GW Instek at www.gwinstek.com.

The OVP voltage is triggered earlier than expected. Why?

When setting the OVP level, account for the voltage drop in the load cables. The OVP is measured at the output terminals, not the load, so the load voltage may be slightly lower. Ensure the OVP setting is sufficiently above the expected load voltage.

Can I combine multiple cables for the output wiring?

Yes, you can use multiple cables in parallel if a single cable cannot handle the current. Make sure the cables are twisted together and of the same length. Also verify the withstand voltage rating.

The accuracy does not match the specification. What should I do?

Ensure the power supply is powered on for at least 30 minutes within an ambient temperature of +20°C to +30°C. This warm-up is required to meet the published specifications.

How do I set up parallel operation with two PSU 20-76 units?

Connect the analog control connectors between master and slave as shown in the manual. Use optional cables (PSU-01C, PSU-02C, PSU-03C). Configure F-93 on each unit: master = 1, slave = 4. Only the master controls the output. See the Parallel/Series Operation chapter.

What is the maximum number of units that can be connected in series?

A maximum of 2 units of the same model can be connected in series. The total output voltage is the sum of both units. Each unit requires independent settings and protection diodes across the outputs.

How do I use remote sense to compensate for voltage drop?

Connect the remote sense wires (S+ and S-) to the load terminals. Remove the local sense jumpers on the remote sense connector. Maximum compensation is 1 V per wire for PSU 20-76. Ensure the output is off before connecting sense wires.

What is the bleeder control and when should it be turned off?

The bleeder resistor discharges the output capacitors when the output is off. It is on by default. For battery charging applications, turn it off to prevent battery discharge (set F-09 to 0).

Can I set a custom internal resistance?

Yes, the internal resistance is adjustable via function setting F-08 from 0.000 to 0.263 Ω. This is useful for simulating batteries or other power sources with internal resistance.

How do I load and run a test script?

Place the script (e.g., t001.tst) in the root of a USB drive. Insert the drive into the front USB port. Use Test key settings: T-02 to copy from USB to memory (slot 1-10), then T-01 to run the script. The script runs automatically. Press Test to abort.

USER MANUAL PSU 20-76 GW Instek

Programmable DC Power Supply

PSU Series

USER MANUAL

GW INSTEK PART NO. 82SU-60250EA1

This manual contains proprietary information, which is protected by copyright. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company.

The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the rights to change specification, equipment, and maintenance procedures at any time without notice.

Table of Contents

SAFETY INSTRUCTIONS 5

GETTING STARTED 9

PSU Series Overview....10

Appearance....14

Theory of Operation....22

OPERATION.... 34

Set Up....36

Basic Operation 51

Parallel / Series Operation....68

Test Scripts 85

CONFIGURATION 93

Configuration Overview 94

ANALOG CONTROL....113

Analog Remote Control Overview...... 114

Remote Monitoring....133

Isolated Analog Control Option ...... 140

COMMUNICATION INTERFACE 156

Interface Configuration 157

FAQ 181

APPENDIX ....183

PSU Factory Default Settings .... 183

Error Messages & Messages ...... 185

LED ASCII Table Character Set ...... 186

PSU Specifications....187

PSU Dimensions....193

Declaration of Conformity 194

INDEX....195

SAFETY INSTRUCTIONS

This chapter contains important safety instructions that you must follow during operation and storage. Read the following before any operation to insure your safety and to keep the instrument in the best possible condition.

Safety Symbols

These safety symbols may appear in this manual or on the instrument.

WARNING

Warning: Identifies conditions or practices that could result in injury or loss of life.

CAUTION

Caution: Identifies conditions or practices that could result in damage to the PSU or to other properties.

DANGER High Voltage

Attention Refer to the Manual

Protective Conductor Terminal

Earth (ground) Terminal

Do not dispose electronic equipment as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased.

Safety Guidelines

General Guideline

CAUTION

• Do not place any heavy object on the PSU.
• Avoid severe impact or rough handling that leads to damaging the PSU.
• Do not discharge static electricity to the PSU.
• Use only mating connectors, not bare wires, for the terminals.
• Do not block the cooling fan opening.
• Do not disassemble the PSU unless you are qualified.

(Measurement categories) EN61010-1:2010 and EN61010-2-030 specifies the measurement categories and their requirements as follows. The PSU falls under category II.

• Measurement category IV is for measurement performed at the source of low-voltage installation.
• Measurement category III is for measurement performed in the building installation.
• Measurement category II is for measurement performed on the circuits directly connected to the low voltage installation.
• 0 is for measurements performed on circuits not directly connected to Mains.

Power Supply

WARNING

• AC Input voltage range: 85Vac\~265Vac
• Frequency: 47Hz to 63Hz
- To avoid electrical shock connect the protective grounding conductor of the AC power cord to an earth ground.

Cleaning the PSU	Disconnect the power cord before cleaning.Use a soft cloth dampened in a solution of mild detergent and water. Do not spray any liquid.Do not use chemicals containing harsh material such as benzene, toluene, xylene, and acetone.
Operation Environment	Location: Indoor, no direct sunlight, dust free, almost non-conductive pollution (Note below)Relative Humidity: 20%~85% (no condensation)Altitude: <2000mTemperature: 0°C to 50°C(Pollution Degree) EN61010-1:2010 and EN61010-2-030 specifies the pollution degrees and their requirements as follows. The PSU falls under degree 2.Pollution refers to “addition of foreign matter, solid, liquid, or gaseous (ionized gases), that may produce a reduction of dielectric strength or surface resistivity”.Pollution degree 1: No pollution or only dry, non-conductive pollution occurs. The pollution has no influence.Pollution degree 2: Normally only non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused by condensation must be expected.Pollution degree 3: Conductive pollution occurs, or dry, non-conductive pollution occurs which becomes conductive due to condensation which is expected. In such conditions, equipment is normally protected against exposure to direct sunlight, precipitation, and full wind pressure, but neither temperature nor humidity is controlled.
Storage environment	Location: IndoorTemperature: -25°C to 70°CRelative Humidity: ≤90%(no condensation)
Disposal	Do not dispose this instrument as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased. Please make sure discarded electrical waste is properly recycled to reduce environmental impact.

Power cord for the United Kingdom

When using the power supply in the United Kingdom, make sure the power cord meets the following safety instructions.

NOTE: This lead/appliance must only be wired by competent persons

WARNING: THIS APPLIANCE MUST BE EARTHED

IMPORTANT: The wires in this lead are coloured in accordance with the following code:

Green/ Yellow:

Earth

Blue:

Neutral

Brown:

Live (Phase)

As the colours of the wires in main leads may not correspond with the coloured marking identified in your plug/appliance, proceed as follows:

The wire which is coloured Green & Yellow must be connected to the Earth terminal marked with either the letter E, the earth symbol or coloured Green/Green & Yellow.

The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black.

The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red.

If in doubt, consult the instructions provided with the equipment or contact the supplier.

This cable/appliance should be protected by a suitably rated and approved HBC mains fuse: refer to the rating information on the equipment and/or user instructions for details. As a guide, a cable of 0.75mm^2 should be protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used.

Any exposed wiring from a cable, plug or connection that is engaged in a live socket is extremely hazardous. If a cable or plug is deemed hazardous, turn off the mains power and remove the cable, any fuses and fuse assemblies. All hazardous wiring must be immediately destroyed and replaced in accordance to the above standard.

GETTING STARTED

This chapter describes the power supply in a nutshell, including its main features and front / rear panel introduction. After going through the overview, please read the theory of operation to become familiar with the operating modes, protection modes and other safety considerations.

Front view of a white electronic device with ventilation grilles and a digital display (no visible text or symbols)

PSU Series Overview 10

Series lineup....10

Main Features....11

Accessories....12

Appearance 14

PSU Series Front Panel....14

PSU Series Display and Operation Panel....17

Rear Panel....19

Theory of Operation 22

Operating Area Description....22

CC and CV Mode 23

Slew Rate....25

Bleeder Control....25

Internal Resistance....26

Alarms 27

Considerations....29

Grounding 32

PSU Series Overview

Series lineup

The PSU series consists of 5 models, covering a number of different current, voltage and power capacities:

Model name	Voltage Rating ^1	Current Rating ^2	Power
PSU 6-200	6V	200A	1200W
PSU 12.5-120	12.5V	120A	1500W
PSU 20-76	20V	76A	1520W
PSU 40-38	40V	38A	1520W
PSU 60-25	60V	25A	1500W

^1 Minimum voltage guaranteed to 0.2% of rating voltage.
^2 Minimum current guaranteed to 0.4% of rating current.

Main Features

Performance	·High power density: 1500W in 1U ·Universal input voltage 85~265Vac, continuous operation. ·Output voltage up to 60V, current up to 200A.
Features	·Active power factor correction. ·Parallel master/slave operation with active current sharing. ·Remote sensing to compensate for voltage drop in load leads. ·19" rack mounted ATE applications. ·A built-in Web server that lets you monitor the instrument directly from an internet browser on your computer. ·OVP, OCP and OHP protection. ·Preset memory function. ·Adjustable voltage and current slew rates. ·Bleeder circuit ON/OFF setting. (To prevent over-discharging of batteries) ·CV, CC priority start function. (Prevents overshoot with output ON) ·Supports test scripts.
Interface	·Built-in RS-232/485, LAN and USB interface. ·Analog output programming and monitoring. ·Optional interfaces: GPIB, Isolated Voltage (0-5V/0-10V) and Isolated Current (4-20mA) programming and monitoring interface. (Factory options)

Accessories

Before using the PSU power supply unit, check the package contents to make sure all the standard accessories are included.

Standard Accessories	Part number	Description	Qty.
		Output terminal cover	1
		Analog connector plug kit	1
		Output terminal M8 bolt set	1
		Input terminal cover	1
	62SB-8K0HD101	1U Handle, ROHS	2
	62SB-8K0HP101	1U BRACKET (LEFT), RoHS	1
	62SB-8K0HP201	1U BRACKET (RIGHT), RoHS	1
	82SU-60250E01	User manual CD	1 set
	82SU-60250M01	Quick start guide	1
	82SU-062H0K01	Packing list
	82GW-00000C01	* CTC GW/INSTEK JAPAN USE ,RoHS	1
Factory Installed Options	Part number	Description
	PSU-GPIB	GPIB interface
	PSU-ISO-V	Voltage programming isolated analog interface
	PSU-ISO-I	Current programming isolated analog interface

Optional Accessories	Part number	Description
	PSU-01C	Cable for 2 units of PSU-Series in parallel mode connection
	PSU-01B	Bus Bar for 2 units of PSU-Series in parallel mode connection
	PSU-02C	Cable for 3 units of PSU-Series in parallel mode connection
	PSU-02B	Bus Bar for 3 units of PSU-Series in parallel mode connection
	PSU-03C	Cable for 4 units of PSU-Series in parallel mode connection
	PSU-03B	Bus Bar for 4 units of PSU-Series in parallel mode connection
	PSU-232	RS232 cable with DB9 connector kit
	PSU-485	RS485 cable with DB9 connector kit
	GRM-001	Rack-mount slides (General Devices P/N: C-300-S-116-RH-LH)
	GTL-246	USB Cable 2.0-A-B Type, Approx. 1.2M
	GPW-001	Power Cord SJT 12AWG/3C, 3m MAX Length, 105 °C, RNB5-5*3P UL/CSA type
	GPW-002	Power Cord H05W-F 1.5mm ^2 /3C, 3m MAX Length, 105 °C, RNB5-5*3P VDE type
	GPW-003	Power Cord VCTF 3.5mm ^2 /3C, 3m MAX Length, 105 °C, RNB5-5*3P PSE type
Download	Name	Description
	psu_cdc.inf	PSU USB driver
Other	Name	Description
	Certificate of traceable calibration

Appearance

PSU Series Front Panel

1. Power Switch

Used to turn the power on/off.

1. USB A Port

USB A port for data transfer, loading test scripts etc.

1. Air Inlet

Air inlet for cooling the inside of the PSU series.

Voltage

1. Lock/Local Button

Lock/Local

Unlock

Unlock Button

Used to lock all front panel buttons other than the Output Button or it switches to local mode.

(Long push) Used to unlock the front panel buttons.

1. PROT Button

PROT

ALM_CLR

ALM_CLR Button

Used to set and display OVP, OCP and UVL.

(Long push) Used to release protection functions that have been activated.

1. Function Button

Function

M1

M1 Button

Used to configure the various functions.

(+Shift) Used to recall the M1 setup. (+Shift and hold) Used to save the current setup to M1.

1. Test Button

TEST

M2

M2 Button

Used to run customized scripts for testing.

(+Shift) Used to recall the M2 setup. (+Shift and hold) Used to save the current setup to M2.

1. Set Button

SET

M3

M3 Button

Used to set and confirm the output voltage and output current.

(+Shift) Used to recall the M3 setup. (+Shift and hold) Used to save the current setup to M3.

1. Shift Button

Used to enable the functions that are written in blue characters below certain buttons.

1. Output Button

Used to turn the output on or off.

1. Output ON LED

Lights in green when the output is on.

PSU Series Display and Operation Panel

Display Area

1. Voltage Meter Displays the voltage or the parameter number of a Function parameter.
2. Current Meter Displays the current or the value of a Function parameter.
3. CV LED Lights in green during constant voltage mode.
4. CC LED Lights in green during constant current mode.
5. VSR LED Lights up when CV Slew Rate Priority is enabled.
6. LAN LED Lights up when the LAN interface is connected.
7. RMT LED Lights in green during remote control.
8. ERR LED Lights in red when an error has occurred.
9. DLY LED The Output On/Off Delay indicator LED.

10. ALM LED Lights in red when a protection function has been activated.

11. ISR LED Lights up when CC Slew Rate Priority is enabled.

12. M1 LED Lights in green when the memory value are being recalled or saved.
13. M2 LED Lights in green when the memory value are being recalled or saved.
14. M3 LED Lights in green when the memory value are being recalled or saved.
15. RUN LED Lights up when a Test Script has been activated.

Rear Panel

1. AC Input

Wire clamp connector.

1. DC Output

Output terminals for 6V to 60V models.

1. Remote-IN

Two different types of cables can be used for RS232 or RS485-based remote control.

PSU-232: RS232 cable with DB9 connector kit.

PSU-485: RS485 with DB9 connector kit.

1. Remote-OUT

RJ-45 connector that is used to daisy chain power supplies with the Remote-IN port to form a communication bus.

PSU-485S: Serial link cable with RJ-45 shielded connector.

1. Analog Control

External analog control connector.

1. Remote Sense

Compensation of load wire drop.

1. Ground Screw

Connector for grounding the output (two positions, shown in red).

Theory of Operation

The theory of operation chapter describes the basic principles of operation, protection modes and important considerations that must be taken into account before use.

Operating Area Description

Background

The PSU power supplies are regulated DC power supplies with a high voltage and current output. These operate in CC or CV mode within a wide operating range limited only by the voltage or current output.

The operating area of each power supply is determined by the rated output power as well as the voltage and current rating.

Below is a comparison of the operating areas of each power supply.

PSU Series Operating Area

CC and CV Mode

CC and CV mode Description

When the power supply is operating in constant current mode (CC) a constant current will be supplied to the load. When in constant current mode the voltage output can vary, whilst the current remains constant. When the load resistance increases to the point where the set current limit ( I_SET ) can no longer be sustained the power supply switches to CV mode. The point where the power supply switches modes is the crossover point.

When the power supply is operating in CV mode, a constant voltage will be supplied to the load, whilst the current will vary as the load varies. At the point that the load resistance is too low to maintain a constant voltage, the power supply will switch to CC mode and maintain the set current limit.

The conditions that determine whether the power supply operates in CC or CV mode depends on the set current ( I_SET ), the set voltage ( V_SET ), the load resistance ( R_L ) and the critical resistance ( R_C ). The critical resistance is determined by V_SET/I_SET . The power supply will operate in CV mode when the load resistance is greater than the critical resistance. This means that the voltage output will be equal to the V_SET voltage but the current will be less than I_SET . If the load resistance is reduced to the point that the current output reaches the I_SET level, the power supply switches to CC mode.

Conversely the power supply will operate in CC mode when the load resistance is less than the critical resistance. In CC mode the current output is equal to I_SET and the voltage output is less than V_SET .

Bleeder Control

Background

The PSU DC power supplies employ a bleed resistor in parallel with the output terminals.  Bleed resistors are designed to dissipate the power from the power supply filter capacitors when power is turned off and the load is disconnected. Without a bleed resistor, power may remain charged on the filter capacitors for

		some time and be potentially hazardous.
		In addition, bleed resistors also allow for smoother voltage regulation of the power supply as the bleed resistor acts as a minimum voltage load.
		The bleed resistance can be turned on or off using the configuration settings.
Note		By default the bleed resistance is on. For battery charging applications, be sure to turn the bleed resistance off as the bleed resistor can discharge the connected battery when the unit is off.

Internal Resistance

Background

On the PSU, the internal resistance of the power supply can be user-defined in software. (Internal Resistance Setting, see the Normal Function Settings on page 99.) When the internal resistance is set it can be seen as a resistance in series with the positive output terminal. This allows the power supply to simulate power sources that have internal resistances such as lead acid batteries. By default the internal resistance is 0Ω.

Internal Resistance Range	Unit Model	Internal Resistance Range
	PSU 6-200	0.000 ~ 0.030Ω
	PSU 12.5-120	0.000 ~ 0.104Ω
	PSU 20-76	0.000 ~ 0.263Ω
	PSU 40-38	0.000 ~ 1.053Ω
	PSU 60-25	0.000 ~ 2.400Ω

Alarms

The PSU power supplies have a number of protection features. When one of the protection alarms are tripped, the ALM icon on the display will be lit and the type of alarm that has been tripped will be shown on the display. When an alarm has been tripped the output will be automatically turned off. For details on how to clear an alarm or to set the protection modes, please see page 51.

OVP	Over voltage protection (OVP) prevents a high voltage from damaging the load. This alarm can be set by the user.
OCP	Over current protection prevents high current from damaging the load. This alarm can be set by the user.
UVL	Under voltage limit. This function sets a minimum voltage setting level for the output. It can be set by the user.
OHP	Over temperature protection for slave and master board. OHP is a hardware protection function. Only when the unit has cooled can the over temperature protection alarms be cleared.
OH1	Master board over temperature protection.
OH2	Slave board over temperature protection.
ALM SENS	Sense alarm. This alarm will detect if the sense wires have been connected to the wrong polarity.
HW OVP	Hardware over voltage protection. This is a hardware OVP that is fixed at approximately 120% of the rated voltage output.

PSU Series User Manual

AC	AC Fail. This alarm function is activated when a low AC input is detected.
FAN FAIL	Fan failure. This alarm function is activated when the fan RPMs drop to an abnormally low level.
Shutdown	Force Shutdown is not activated as a result of the PSU series detecting an error. It is a function that is used to turn the output off through the application of a signal from the rear-panel analog control connector when an abnormal condition occurs.
Alarm output	Alarms are output via the analog control connector. The alarm output is an isolated open-collector photo coupler output.

Considerations

The following situations should be taken into consideration when using the power supply.

Inrush current

When the power supply switch is first turned on, an inrush current is generated. Ensure there is enough power available for the power supply when first turned on, especially if a number of units are turned on at the same time.

Pulsed or Peaked loads When the load has current peaks or is pulsed, it is possible for the maximum current to exceed the mean current value. The PSU power supply ammeter only indicates mean current values, which means for pulsed current loads, the actual current can exceed the indicated value. For pulsed loads, the current limit must be increased, or a power supply with a greater capacity must be chosen. As shown below, a pulsed load may exceed the current limit and the indicated current on the power supply ammeter.  Reverse Current: Regenerative load When the power supply is connected to a regenerative load such as a transformer or inverter, reverse current will feed back to the power supply. The PSU power supply cannot absorb reverse current. For loads that create reverse current, connect a resistor in parallel to the power supply to bypass the reverse current. This description only applies when the bleed resistance is off.  Reverse current  Note The current output will decrease by the amount of current absorbed by the resistor. Ensure the resistor used can withstand the power capacity of the power supply/load. Reverse Current: Accumulative energy. When the power supply is connected to a load such as a battery, reverse current may flow back to the power supply. To prevent damage to the power supply, use a reverse-current-protection diode in series between the power supply and load. 

CAUTION

Ensure the reverse withstand voltage of the diode is able to withstand 2 times the rated output voltage of the power supply and the forward current capacity can withstand 3 to 10 times the rated output current of the power supply. Ensure the diode is able to withstand the heat generated in the following scenarios. When the diode is used to limit reverse voltage, remote sensing cannot be used.

Grounding

The output terminals of the PSU power supplies are isolated with respect to the protective grounding terminal. The insulation capacity of the load, the load cables and other connected devices must be taken into consideration when connected to the protective ground or when floating.

Floating

As the output terminals are floating, the load and all load cables must have an insulation capacity that is greater than the isolation voltage of the power supply. 

graph LR
    A["Ext-V\nExt-R"] --> B["PSU"]
    B --> C["Load"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    subgraph Analog connector
        A
        B
        C
    end

(----) Insulation capacity ≥ isolation voltage of power supply 

WARNING

If the insulation capacity of the load and load cables are not greater than the isolation voltage of the power supply, electric shock may occur. Grounded output terminal If the positive or negative terminal is connected to the protective ground terminal, the insulation capacity needed for the load and load cables is greatly reduced. The insulation capacity only needs to be greater than the maximum output voltage of the power supply with respect to ground. 

graph LR
    A["Ext-V\nExt-R"] --> B["PSU"]
    B --> C["Load"]
    D["Analog connector"] --> B
    B --> E["+"]
    B --> F["-"]
    B --> G["+"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#ffc,stroke:#333
    style F fill:#fcc,stroke:#333
    style G fill:#ffc,stroke:#333

(----) Insulation capacity ≥ voltage of power supply with respect to ground

CAUTION

If using external voltage control, do not ground the external voltage terminal as this will create a short circuit. 

PERATION

Set Up.... 36

Line Voltage Connection....36 Power Up....38 Wire Gauge Considerations....39 Output Terminals 41 Using the Output Terminal Cover 43 Using the Rack Mount Kit 44 How to Use the Instrument 45 Reset to Factory Default Settings 47 View System Version and Build Date 48

Basic Operation 51

Setting OVP/OCP/UVL Levels 51 Set to C.V. Priority Mode 54 Set to C.C. Priority Mode 57 Panel Lock 60 Save Setup....60 Recall Setup 61 Voltage Sense 62 Remote Sense Connector....62 Remote Sense Cover....63 Local Sense....64 Remote Sense 64

Parallel / Series Operation 68

Master-Slave Parallel Overview....69 Master-Slave Parallel Connection....72 Master-Slave Parallel Operation....75 Master-Slave Parallel Calibration....77 Master-Slave Series Overview 79 Series Connection 81 Series Operation....83

Test Scripts 85

Test Script File Format 86 Test Script Settings....86 Setting the Test Script Settings 87 Load Test Script from USB....88 Run Test Script....89 Export Test Script to USB 90 Remove Test Script....91

Set Up

Line Voltage Connection

Background	The PSU power supplies use a universal power input that can be used with 100 and 240 Vac systems. To connect or replace the power cord (user supplied, specification below), use the procedure below:
Warning	The following procedure should only be attempted by competent persons.Ensure the AC power cord is not connected to power. Always allow the power supply to fully discharge before disconnecting the AC power cord.
Recommended Power Cord Specifications	25A 250V, 3x12 AWG, outer diameter: 9-11mm, rated 60 °C min., 3m maximum length and approved by the national safety standards for the country of use.
Note	The PSU has a number of power cord options available. Please see the optional accessories on page 12 for details.
Removal	1. Turn off the power switch and unplug the power from the socket.2. Unscrew the power cord protective sheath.3. Remove the 2 screws holding the power cord cover and remove.4. Remove the AC power cord wires with a flat head screwdriver.


Installation

1. Connect the AC power cord wires to the AC input terminals. - Black/Brown Line (L) - White/Blue Neutral (N) - Green /Green & Yellow → Ground ( )   2. Make sure the sheath is tightened to the lock nut. 3. Re-install the power cord cover. 

Power Up

Steps

1. Connect the power cord to the universal power input. Page 36 2. Press the POWER switch on.  3. The power supply will show the Power On settings (Pon) at start up. If no Power On settings are configured, the PSU will recover the state right before the power was last turned OFF. If used for the first time, the default settings will appear on the display. For default configuration settings, see page 183.  

Note

You may also configure how the PSU will behave on startup by altering the Power On Configuration settings, see page 107.

Power Down

To turn the PSU power supply off, press the power switch again (0 position). It may take a few seconds for the power supply to fully turn off. 

CAUTION

The power supply takes around 8 seconds to fully turn on or shutdown. Do not turn the power on and off quickly. Please wait for the display to fully turn off. Wire Gauge Considerations

Background	Before connecting the output terminals to a load, the wire gauge of the cables should be considered.
	It is essential that the current capacity of the load cables is adequate. The rating of the cables must equal or exceed the maximum current rated output of the instrument.
Recommended wire gauge	Wire Gauge	Nominal Cross Section	Maximum Current
	20	0.5	9
	18	0.75	11
	18	1	13
	16	1.5	18
	14	2.5	24
	12	4	34
	10	6	45
	8	10	64
	6	16	88
	4	25	120
	2	32	145
	1	50	190
	00	70	240
	000	95	290
	0000	120	340
	The maximum temperature rise can only be 60 degrees above the ambient temperature. The ambient temperature must be less than 30 degrees.

To minimize noise pickup or radiation, the load wires and remote sense wires should be twisted-pairs of the shortest possible length. Shielding of the sense leads may be necessary in high noise environments. Where shielding is used, connect the shield to the chassis via the rear panel ground screw. Even if noise is not a concern, the load and remote sense wires should be twisted-pairs to reduce coupling, which might impact the stability of the power supply. The sense leads should be separated from the power leads.

Output Terminals

Background

Before connecting the output terminals to the load, first consider whether voltage sense will be used, the gauge of the cable wiring and the withstand voltage of the cables and load. The output terminals can be connected to load cables using M8 sized bolts.

WARNING

Dangerous voltages. Ensure that the power to the instrument is disabled before handling the power supply output terminals. Failing to do so may lead to electric shock.

Steps

1. Turn the power switch off.  2. Remove the output terminal cover. Page 43 3. If necessary, connect the chassis Page 32 ground terminal to either the positive or negative terminal. See the grounding chapter for details.  4. Choose a suitable wire gauge and crimping terminal for the load cables. Page 39 5. Connect the positive load cable to the positive output terminal and the negative cable to the negative output terminal. 6. Reattach the output terminal cover. Page 43 Connection Example Use the included M8-sized bolt set to connect the load cables to the output terminals. Make sure that the connections are tight and that washers and spring washers are used to ensure a good connection. 

Using the Output Terminal Cover

Steps

1. Partially unscrew the 2 screws beside the terminals. 2. Line-up the notches in the cover with the 2 screws. 3. Tighten the screws to secure the cover over the terminals. 

Technical line drawing of a mechanical or electrical component with no visible text, numbers, or symbols.

Removal

Reverse the procedure to remove the terminal covers.

Using the Rack Mount Kit

Background

The PSU series are designed to be directly mounted into 19 inch 1U rack mounts. The PSU can be installed using the sliding mounts (GW Part number: GRM-001). See the GRM-001 manual for installation instructions. Rack mount diagram: Sliding mounts  The following diagram shows the approximate dimensions of the GRM-001 sliding mounts. These sliding mounts should only be used within racks with a depth of 500mm.

How to Use the Instrument

Background

The PSU power supplies use a novel method of configuring parameter values only using the voltage or current knobs. The knobs are used to quickly edit parameter values at 0.01, 0.1 or 1 unit steps at a time. When the user manual says to set a value or parameter, use the steps below.

Example

Use the Voltage knob to set a voltage of 10.05 volts. 1. Repeatedly press the Voltage knob until the least significant digit is highlighted. This will allow the voltage to be edited in 0.01 volt steps.  2. Turn the Voltage knob till 0.05 volts is shown on the voltage display.   3. Repeatedly press the Voltage knob until the most significant digit is highlighted. This will allow the voltage to be edited in 1 volt steps. 4. Turn the Voltage knob until 10.05 is shown.   Note Notice the Set key becomes illuminated when setting the current or voltage. If the voltage or current knobs are unresponsive, press the Set key first.

Reset to Factory Default Settings

Background

The F-88 configuration setting allows the PSU to be reset back to the factory default settings. See page 183 for the default factory settings.

Steps

1. Press the Function key. The Function key will light up. Function  2. The display should show F-01 on the top and the configuration setting for F-01 on the bottom.  3. Rotate the Voltage knob to change the F setting to F-88 (Factory Set Value).  4. Use the Current knob to set the F-88 setting to 1 (Return to factory default settings).  5. Press the Voltage knob to confirm. ConF will be displayed when it is configuring.   6. Press the Function key again to exit. The Function key light will turn off. 

View System Version and Build Date

Background

The F-89 configuration setting allows you to view the PSU version number, build date, keyboard version, analog-control version, kernel build, test command version and test command build date.

Steps

1. Press the Function key. The Function key will light up. Function  2. The display should show F-01 on the top and the configuration setting for F-01 on the bottom.  3. Rotate the Voltage knob to change the F setting to F-89 (Show Version).  4. Rotate the Current knob to view the version and build date for the various items.  F-89 0-XX: Version (1/2) 1-XX: Version (2/2) 2-XX: Build On-Year. (1/2) 3-XX: Build On-Year. (2/2) 4-XX: Build On-Month. 5-XX: Build On-Day. 6-XX: Keyboard CPLD. (1/2) 7-XX: Keyboard CPLD. (2/2) 8-XX: Analog Board CPLD. (1/2) 9-XX: Analog Board CPLD. (2/2) A-XX: Analog Board FPGA (1/2) B-XX: Analog Board FPGA. (1/2) C-XX: Kernel Build On-Year. (1/2) D-XX: Kernel Build On-Year. (2/2) E -XX: Kernel Build On-Month. F-XX: Kernel Build On-Day. G-XX: Test Command Version. (1/2) H-XX: Test Command Version. (2/2) I-XX: Test Command Build On-Year. (1/2) J-XX: Test Command Build On-Year. (2/2) K-XX: Test Command Build On-Month. L-XX: Test Command Build On-Day. 5. Press the Function key again to exit. The Function key light will turn off. Function  Example Main Program Version: V01.00, 2013/06-01 0-01: Version 1-00: Version 2-20: Build On-Year. 3-13: Build On-Year. 4-06: Build On-Month. 5-01: Build On-Day.

Example	Keyboard CPLD Version: 0x030C
	6-03: Keyboard CPLD Version.7-0C: Keyboard CPLD Version.
Example	Analog CPLD Version: 0x0421
	8-04: Analog CPLD Version.9-21: Analog CPLD Version.
Example	Analog Board FPGA: 0x0241
	A-02: Analog FPGA Version.B-41: Analog FPGA Version.
Example	Kernel Version: 2013/01/22
	C-20: Kernel Build On-Year.D-13: Kernel Build On-Year.E-01: Kernel Build On-Month.F-22: Kernel Build On-Day.
Example	Test Command Version: V01:00, 2013/06/01
	G-01: Test Command Version.H-00: Test Command Version.I-20: Test Command Build On-Year.J-13: Test Command Build On-Year.K-06: Test Command Build On-Month.L-01: Test Command Build On-Day.

Basic Operation

This section describes the basic operations required to operate the power supply. - Setting OVP/OCP/UVL from page 51 • C.V. priority mode → from page 54 • C.C. priority mode → from page 57 • Panel lock → page 60 - Save/Recall setups from page 60/61 • Voltage Sense → from page 62 Before operating the power supply, please see the Getting Started chapter, page 9. Setting OVP/OCP/UVL Levels The OVP level and OCP level has a selectable range that is based on the output voltage and output current, respectively. The OVP and OCP level is set to the highest level by default. The actual selectable OVP and OCP range depends on the PSU model. When one of the protection measures are on, ALM indicator is lit red on the front panel and the type of alarm is also shown on the display. The ALM\_CLR button can be used to clear any protection functions that have been tripped. By default, the output will turn off when the OVP or OCP protection levels are tripped. The UVL will prevent you from setting a voltage that is less than the UVL setting. The UVL setting range is from 0% \~ 105% of the rated output voltage. 

Example: OVP alarm

Before setting the protection settings: - Ensure the load is not connected. - Ensure the output is turned off.  Note You can use the Function settings (F-13 and F-14) to apply limits to the voltage and current settings, respectively. You can set limitations so that the values do not exceed the set OVP and the set OCP level, and so that the values are not lower than the set UVL trip point. By using this feature, you can avoid turning the output off by mistakenly setting the voltage or current to a value that exceeds the set OVP or OCP level or to a value that is lower than the set UVL trip point. If you have selected to limit the voltage setting (F-14), you will no longer be able to set the output voltage to a value that is above about 95% of the OVP trip point or to a value that is lower than the UVL trip point. If you have selected to limit the current setting (F-13), you will no longer be able to set the output current to a value that is above about 95% of the OCP trip point.

Steps

1. Press the PROT key. The PROT key lights up. PROT  2. The OVP protection function will be displayed on the voltage display and the setting will be displayed on the current display.  Choose a Protection Function 3. Use the Voltage knob to select a protection function. Range OVP, OCP, UVL  Setting the Protection Level 4. Use the Current knob to set the protection level for the selected function. 

Setting Range
PSU Model	OCP	OVP	UVL
6-200	5~220	0.6~6.6	0~6.3
12.5-120	5~132	1.25~13.75	0~13.12
20-76	5~83.6	2~22	0~21
40-38	3.8~41.8	4~44	0~42
60-25	2.5~27.5	5~66	0~63

5. Press PROT again to exit. The PROT key light will turn off.  Clear OVP/OCP/UVL protection The OVP, OCP or UVL protection can be cleared after it has been tripped by holding the ALM\_CLR button for 3 seconds. 

Set to C.V. Priority Mode

When setting the power supply to constant voltage mode, a current limit must also be set to determine the crossover point. When the current exceeds the crossover point, the mode switches to C.C. mode. For details about C.V. operation, see page 23. C.C. and C.V. mode have two selectable slew rates: High Speed Priority and Slew Rate Priority. High Speed Priority will use the fastest slew rate for the instrument while Slew Rate Priority will use a user-configured slew rate.

Background

Before setting the power supply to C.V. mode, ensure: • The output is off. • The load is connected.

Steps

1. Press the Function key. The Function key will light up.  2. The display will show the function (F-01) on the voltage display and the setting for the function in the current display.  3. Rotate the Voltage knob to change the F setting to F-03 (V-I Mode Slew Rate Select).  4. Use the Current knob to set the F-03 setting.  Set F-03 to 0 (CV High Speed Priority) or 2 (CV Slew Rate Priority). F-03 0 = CV High Speed Priority 2 = CV Slew Rate Priority 5. Press the Voltage knob to save the configuration setting. ConF will be displayed when it is configuring.   6. If CV Slew Rate Priority was chosen as the operating mode, set F-04 (Voltage Slew Rate Up) and the F-05 (Voltage Slew Rate Down) and save. F-04 / F-05 0.001V\~0.06V/msec (PSU 6-200) 0.001V\~0.125V/msec (PSU 12.5-120) 0.001V\~0.2V/msec (PSU 20-76) 0.001V\~0.4V/msec (PSU 40-38) 0.001V\~0.6V/msec (PSU 60-25) 7. Press the Function key again to exit the configuration settings. The function key light will turn off.  8. Use the Current knob to set the current limit (crossover point). 

	9. Use the Voltage knob to set the voltage.
Note	Notice the Set key becomes illuminated when setting the current or voltage. If the Voltage or Current knobs are unresponsive, press the Set key first.
	10. Press the Output key. The Output ON LED becomes lit.CV will become illuminated (center)	Output—●
	Only the voltage level can be altered when the output is on. The current level can only be changed by pressing the Set key.

For more information on the Normal Function Settings (F-00 \~ F-61, F-88\~F-89) see page 99.

Set to C.C. Priority Mode

When setting the power supply to constant current mode, a voltage limit must also be set to determine the crossover point. When the voltage exceeds the crossover point, the mode switches to C.V. mode. For details about C.C. operation, see page 23. C.C. and C.V. mode have two selectable slew rates: High Speed Priority and Slew Rate Priority. High Speed Priority will use the fastest slew rate for the instrument while Slew Rate Priority will use a user-configured slew rate.

Background

Before setting the power supply to C.C. mode, ensure: • The output is off. • The load is connected.

Steps

1. Press the Function key. The Function key will light up. Function  2. The display will show the function (F-01) on the voltage display and the setting for the function in the current display.  3. Rotate the Voltage knob to change the F setting to F-03 (V-I Mode Slew Rate Select).  4. Use the Current knob to set the F-03 setting.  Set F-03 to 1 (CC High Speed Priority) or 3 (CC Slew Rate Priority) and save. F-03 1 = CC High Speed Priority 3 = CC Slew Rate Priority 5. Press the Voltage knob to save the configuration setting. ConF will be displayed when it is configuring.   ISR indicator for CC Slew Rate Priority (F-03=3) 6. If CC Slew Rate Priority was chosen as the operating mode, set F-06 (Current Slew Rate Up) and F-07 (Current Slew Rate Down) and save. F-06 / F-07 0.001A\~2A / msec (PSU 6-200) 0.001A\~1.2A / msec (PSU 12.5-120) 0.001A\~0.76A / msec (PSU 20-76) 0.001A\~0.38A / msec (PSU 40-38) 0.001A\~0.25A / msec (PSU 60-25) 7. Press the Function key again to exit the configuration settings. The Function key light will turn off.  8. Use the Voltage knob to set the voltage limit (crossover point).  9. Use the Current knob to set the current.   Note Notice the Set key becomes illuminated when setting the current or voltage. If the Voltage or Current knobs are unresponsive, press the Set key first. 10. Press the Output key. The Output key becomes illuminated.  CC will become illuminated (right)   Note Only the current level can be altered when the output is on. The voltage level can only be changed by pressing the Set key. For more information on the Normal Function Settings (F-00 \~ F-61, F-88\~F-89) see page 99.

Panel Lock

The panel lock feature prevents settings from being changed accidentally. When activated, the Lock/Local key will become illuminated and all keys and knobs except the Lock/Local key and Output key (if active) will be disabled. If the instrument is remotely controlled via the USB/LAN interface, the panel lock is automatically enabled. Activate the panel lock Press the Lock/Local key to active the panel lock. The key will become illuminated. Lock/Local  Disable the panel lock Hold the Lock/Local key for \~3 seconds to disable the panel lock. The key's light will turn off. Lock/Local  

Save Setup

The PSU has 3 dedicated keys (M1, M2, M3) to save the set current, set voltage, OVP, OCP and ULV settings. Save Setup 1. Press the SHIFT key. The shift key will light blue.  2. Hold the desired memory key for >3 seconds (M1, M2, M3).  M1 (hold) 3. When the setup is saved the unit will beep, the setup will be saved and the memory number will be shown on the display. 

Recall Setup

The PSU has 3 dedicated keys (M1, M2, M3) to recall setups.

Recall Setup

1. Press the SHIFT key. The shift key will light blue. 2. Press the desired memory key to recall the desired setup (M1, M2, M3). 3. When the setup is recalled the setup will be loaded and the memory number will be shown on the display.   

Note

The F-15 function setting will determine whether the saved contents of the recalled memory setting are displayed or not.

Voltage Sense

The PSU power supplies can be operated using local or remote voltage sense. By default the PSU ships configured for local sense.

Remote Sense Connector

The Remote Sense connector includes a detachable plug to facilitate making the sense connections. The remote sense connector also has a safety cover. 

WARNING

Ensure the output is off before handling the remote sense connector. Use sense cables with a voltage rating exceeding the isolation voltage of the power supply. Never connect sensing cables when the output is on. Electric shock or damage to the power supply could result. Remote Sense Connector Overview When using the remote sense connector make sure the wires that are used follow the following guidelines: Wire gauge: AWG 28 to AWG 16 Strip length 7mm // 0.28 in.  +S: Remote(+) sense +LS: Local (+) sense NC: Not connected -LS: Local (-) sense -S: Remote (-) sense

Remote Sense Cover


WARNING

Ensure the output is off before handling the remote sense connector. Use sense cables with a voltage rating exceeding the isolation voltage of the power supply. Never connect sensing cables when the output is on. Electric shock or damage to the power supply could result. Always operate the PSU with the remote sense cover.

Connector

1. Place the cover over the remote sense connector. 2. Secure the cover with the provided screw. 

Local Sense

When using local sense, the sensing terminals are connected to the local sense terminals (via the local sense connections) and thus do not compensate for any possible voltage drop that is seen on the load cables. Local sense is only recommended when the voltage drop is of no consequence or for load-current applications. By default, the sense plug is already configured to local sensing. Local Sense Connection 

graph TD
    A["PSU Load"] --> B["Output"]
    A --> C["Input"]
    D["Remote Sense"] --> E["S-"]
    D --> F["LS-"]
    D --> G["LS+"]
    D --> H["S+"]
    E --> I["Ground"]
    F --> I
    G --> I
    H --> I
    I --> J["Output"]
    I --> K["Input"]

Page 62

Remote Sense

Remote sense is used to compensate for the voltage drop seen across load cables due to the resistance inherent in the load cables. The remote sense terminals are connected to the load terminals of the DUT to determine the voltage drop across the load cables. Remote sense can compensate up to 1 volt (PSU 6-200/12.5-120/20-76), 2 volts (PSU 40-38) or 3 volts (PSU 60-25) (compensation voltage, single line). Load cables should be chosen with a voltage drop less than the compensation voltage. Although you can use remote sense to compensate up to 3V for a single line, it is recommended that the voltage drop is minimized to a maximum of 1V to prevent excessive output power consumption from the power supply and poor dynamic response to load changes.  WARNING Ensure the output is off before connecting any sense cables. Use sense cables with a voltage rating exceeding

		the isolation voltage of the power supply.
		Never connect sensing cables when the output is on. Electric shock or damage to the power supply could result.
Note		Be sure to remove the sense jumpers from the remote sense connector so the unit is not using local sensing.
Single Load		1. Connect the S+ terminal to the positive potential of the load. Connect the S- terminal to the negative potential of the load.Page 622. Operate the instrument as normal. Page 51 See the Basic Operation chapter for details.
Parallel PSU Units		1. Connect the S+ terminals to the positive potential of the load. Connect the S- terminals to the negative potential of the load.


graph TD
    subgraph PSU #1
        A["Output"] --> B["+"]
        C["Output"] --> D["-"]
        E["S+"] --> F["+"]
        G["S-"] --> H["-"]
    end
    subgraph PSU #2
        I["Output"] --> J["+"]
        K["Output"] --> L["-"]
        M["S+"] --> N["+"]
        O["S-"] --> P["-"]
    end
    B --> Q["Load"]
    D --> Q
    L --> Q
    N --> Q
    P --> Q
    Q --> R["Page 62"]

2. Operate the instrument as normal. Page 69 See the Parallel Operation chapter for details. Serial PSU Units 1. a. Connect the 1^st S+ terminal to the positive potential of the load. b. Connect the 1^stS -terminal to the positive output terminal of the second PSU unit. c. Connect the 2^nd S+ terminal to the positive terminal of the second PSU unit. d. Connect the 2^nd S-terminal to negative terminal of the load. 

graph TD
    subgraph PSU #1
        A["Output"] --> B["+"]
        C["Output"] --> D["-"]
        E["S+"] --> F["+"]
        G["S-"] --> H["-"]
    end
    subgraph PSU #2
        I["Output"] --> J["+"]
        K["Output"] --> L["-"]
        M["S+"] --> N["+"]
        O["S-"] --> P["-"]
    end
    B --> Q["Load"]
    D --> Q
    F --> Q
    H --> Q
    J --> Q
    L --> Q
    N --> Q
    P --> Q
    Q --> R["Input"]
    Q --> S["Input"]
    Q --> T["Load"]
    style PSU #1 fill:#f9f,stroke:#333
    style PSU #2 fill:#f9f,stroke:#333

2. Operate the instrument as normal. Page 77 See the Serial Operation chapter for details. Wire Shielding and Load line impedance To help to minimize the oscillation due to the inductance and capacitance of the load cables, use an electrolytic capacitor in parallel with the load terminals. To minimize the effect of load line impedance use twisted wire pairing. 

Parallel / Series Operation

This section describes the basic operations required to operate the power supply in series or parallel. Operating the PSU series in parallel increases the total current output of the power supply units. When used in series, the total output voltage of the power supplies can be increased. When the units are used in parallel or in series, a number of precautions and limitations apply. Please read the following sections before operating the power supplies in parallel or series. • Master-slave parallel overview → from page 69 - Parallel connection from page 72 • Parallel operation → from page 75 • Master-slave parallel calibration → from page 77 • Master-slave Series overview → page 79 - Series connection page 81 • Series operation → from page 83

Master-Slave Parallel Overview

Background

When connecting the PSU power supplies in parallel, up to 4 units can be used in parallel and all units must be of the same model with similar output settings. To use the power supplies in parallel, units must be used in a “master-slave” configuration. In the master-slave configuration a “master” power supply controls any other connected “slave” power supplies. In order for the master unit to control the slave units, the master unit must use the analog control connector to control the slave units. When using the Analog Control Connector, the connector must be wired correctly between the master and each of the slave units. For the complete connector pin assignment, see page 115, or alternatively, the PSU-01C, PSU-02C and the PSU-03C cables can be used to connect a master to unit to 1, 2 or 3 slave units, respectively. 

graph TD
    A["Ext-V"] --> B["Master"]
    C["Ext-R"] --> B
    D["VMON"] --> B
    E["IMON"] --> B
    F["Slave"] --> B
    G["Slave"] --> B
    H["Slave"] --> B
    I["Load"] --> B
    J["Analog Control Connector"] --> F
    J --> G
    J --> H
    J --> I

Limitations

Display

\- Only the master unit will display the voltage and current.

OVP/ OCP/UVL

\- Slave units follow the settings of the master when OVP/OCP/UVL is tripped on the master unit.

Remote monitoring

\- Voltage monitoring (VMON) and current monitoring (IMON) are only supported on the master unit. \- The IMON current represents the total current of the all the parallelized units.

Remote Sense

\- Please see the remote sense chapter for details, page 64.

Parallel Calibration

\- The parallel calibration function can be used to offset cables losses.

External Voltage and Resistance Control

\- Voltage/Resistance controlled remote control can only be used with the master unit. \- The full scale current (in parallel) is equivalent to the maximum external voltage or resistance.

Internal Resistance

- For 2 units in parallel, the internal resistance is actually half of the setting value. - For 3 units in parallel, the internal resistance is actually a third of the setting value. - For 4 units in parallel, the internal resistance is actually a fourth of the setting value. - See function setting F-08 for internal resistance settings, page 101.

Bleeder Control

\- The Master unit is used to control the bleeder settings. The bleeder resistors in all the slave units are always turned off when in parallel mode.

Output Voltage/ Output Current	Model	1 unit	2 units	3 units	4 units
	PSU 6-200	6V	6V	6V	6V
		200A	400A	600A	800A
	PSU 12.5-120	12.5V	12.5V	12.5V	12.5V
		120A	240A	360A	480A
	PSU 20-76	20V	20V	20V	20V
		76A	152A	228A	304A
	PSU 40-38	40V	40V	40V	40V
		38A	76A	114A	152A
	PSU 60-25	60V	60V	60V	60V
		25A	50A	75A	100A

Master-Slave Parallel Connection

Analog Control Connection To operate the power supplies in parallel with the analog connectors, connect the analog connectors on the master and slave units as shown in the diagrams below. Alternatively, preconfigured cables can be used: PSU-01C: 1 master with 1 slave PSU-02C: 1 master with 2 slaves PSU-03C: 1 master with 3 slaves 

graph TD
    subgraph_MASTER_SLAVE_1["MASTER SLAVE #1"]
        A["PRL OUT+ 9"] --> B["12"]
        C["A COM"] --> D["11"]
        E["Status COM1"] --> F["1"]
        G["OUT ON Status"] --> H["16"]
        I["Current SUM"] --> J["13"]
        K["Alarm Status"] --> L["14"]
        M["Shut_Down"] --> N["7"]
        O["A COM"] --> P["20"]
    end

    subgraph_SLAVE_2["SLAVE #2"]
        Q["PRL IN+"] --> R["9"]
        S["PRL IN-"] --> T["8"]
        U["A COM"] --> V["20"]
        W["OUT ON/OFF CONT"] --> X["19"]
        Y["Current Sum"] --> Z["14"]
        AA["Alarm_Status"] --> AB["7"]
        AC["Shut_Down"] --> AD["16"]
        AE["OUT ON Status"] --> AF["1"]
        AG["Status COM1"] --> AH["1"]
    end

    subgraph_SLAVE_3["SLAVE #3"]
        AI["PRL IN+"] --> AJ["9"]
        AK["PRL IN-"] --> AL["8"]
        AM["A COM"] --> AN["20"]
        AO["OUT ON/OFF CONT"] --> AP["19"]
        AQ["Current Sum"] --> AR["13"]
        AS["Alarm_Status"] --> AT["7"]
        AU["Shut_Down"] --> AV["16"]
        AW["Status COM1"] --> AX["1"]
    end

Parallel Output Connection If grounding the positive or negative terminals to the reference ground, be sure to ground the appropriate terminal on each unit (either positive or negative). Example with negative terminal connected to ground 

graph TD
    A["Master"] --> B["Output"]
    A --> C["Ground"]
    D["Load"] --> E["Input"]
    F["Slave #1"] --> G["Output"]
    F --> H["Ground"]
    I["Slave #2"] --> J["Output"]
    I --> K["Ground"]
    B --> L["+"]
    C --> M["-"]
    E --> N["+"]
    E --> O["-"]
    G --> P["+"]
    H --> Q["-"]
    J --> R["+"]
    J --> S["-"]

Steps 1. Ensure the power is off on all power supplies. 2. Choose a master and a slave unit(s). 3. Connect the analog connectors for the master and slave units as shown above. 4. Remove the Output Terminal Page 43 covers. 5. Connect the master and slave unit in parallel as shown above. 6. Reattach the terminal covers. Page 43  Note Ensure the load cables have sufficient Page 39 current capacity. The load wires and remote sense wires should use twisted-paired wiring of the shortest possible length. Master-Slave Parallel Operation

Master-Slave Configuration	Before using the power supplies in parallel, the master and slave units need to be configured.
Steps	1. Configure the OVP, OCP and ULV Page 51 settings for the master unit.2. For each unit, hold the Function key while turning the power on to enter the power on configuration settings.3. Configure F-93 (Master/Slave) setting for each master/slave unit.	Page 111
	Unit	F-93
	Independent (default setting)	0
	Master unit with 1 slave in parallel	1
	Master unit with 2 slaves in parallel	2
	Master unit with 3 slaves in parallel	3
	Slave (parallel)	4
	4. Cycle the power on the units (reset the power).
Note	Configuration settings can be checked on both the master and slave units by pressing the Function key and checking F-93.Only the Master OVP, OCP and UVL settings are used for protection. Slave protection levels are disregarded.OHP works independently for each unit.
Master-Slave Operation	Only operate the power supplies in parallel if the units are configured correctly.
Steps	1. Turn on the master and slave units. The slave unit(s) will show a blank display.Master unitVOLTAGE CURRENTSlave unitsVOLTAGE CURRENT
	2. Operation of all units is controlled via the master unit. Operation of the master unit is the same as for a single unit. See the Basic Operation chapter.3. Press the Output key to begin. The output LED will become lit.
Caution	Only operate the power supplies in parallel if using units of the same model number.
Note	The panel controls are disabled on slave units, including the output key. On slave units, only the Function key can be used to view the current settings.

Master-Slave Parallel Calibration

Master-Slave Configuration

The F-16 function setting can be used to calibrate the output of PSU units connected in parallel. If you feel the accuracy is not good enough when you measure the accuracy in parallel mode, the parallel calibration can be used to get better measurement accuracy.

Steps

1. Short all the terminals together. This is best accomplished by connecting the master and all the slave units in parallel and then shorting the output terminals. 

graph TD
    A["Master"] --> B["Output"]
    A --> C["Ground"]
    D["Slave #1, 2, 3"] --> E["Output"]
    D --> F["Ground"]
    G["Short"] --> H["Switch"]
    style G stroke:#000,stroke-width:2px
    style H stroke:#000,stroke-width:2px

2. Connect the slave units to the master unit using the analog control connectors as described previously. Page 72 3. Configure F-93 (Master/Slave) setting for each master/slave unit, as described previously. Page 75 4. Cycle the power on the units (reset the power). 5. On the master unit, set F-16 (Auto Page 102 Calibration Parallel Control) to 2 to turn on the parallel calibration. Calibration will begin immediately. 6. Whilst calibration is being performed, WAIT will be displayed on the master screen. Calibration will take a few moments.  7. When the calibration has finished, OK will be displayed on the master screen.  8. Remove the shorts from the terminals, and proceed with parallel operation.  When performing parallel calibration, make sure the terminals are connected with cables or bus bars that are able to withstand the combined current capacity of all the units in parallel.

Master-Slave Series Overview

Background

When connecting PSU power supplies in series, up to 2 units can be used in series and all units must be of the same model. When operated in series, the power supplies can be used to increase the voltage output or setup the power supplies to output both positive and negative polarities. Unlike with the parallel operation, the series operation does not require any special configuration as each power supply is operated and controlled individually. When the units are used in series, a number of precautions and limitations apply. Please read this overview before operating the power supplies in series. 

graph TD
    A["Ext-V\nExt-R\nVMON\nIMON"] --> B["Master"]
    C["Ext-V\nExt-R\nVMON\nIMON"] --> D["Slave"]
    B --> E["Load"]
    D --> E
    B --> F["+"]
    B --> G["-"]
    D --> H["+"]
    D --> I["-"]

Limitations

Display

\- Master and slave units display both the current and the voltage. The total voltage is the sum of the units.

OVP/OCP/ULV

- OVP, OCP and ULV level for each unit must be set separately. - The OVP and OCP protections are tripped independently on the master and slave.

Remote monitoring

- Voltage monitoring (VMON) and current monitoring (IMON) should be performed on both units. - The VMON voltage represents the voltage of that particular unit.

Remote Sense

\- Please see the voltage sense chapter for details, page 62.

External Voltage and Resistance Control

- Voltage/Resistance controlled remote control should be used on both units separately. - The full scale voltage (in series) is equivalent to the maximum external voltage or resistance.

Slew Rate

\- The slave rate should be set for both units.

Internal Resistance

\- The internal resistance should be set for both units.

Bleeder Control

\- The bleeder resistor setting should be set equally on both units.

Output Voltage/ Output Current	Model	Single unit	2 units
	PSU 6-200	6V	12V
		200A	200A
	PSU 12.5-120	12.5V	25V
		120A	120A
	PSU 20-76	20V	40V
		76A	76A
	PSU 40-38	40V	80V
		38A	38A
	PSU 60-25	60V	120V
		25A	25A

Series Connection

If using the PSU in series, please be aware that each unit is acts independently and thus there are no special communication buses for serial connections. Series Connection to increase Voltage Output 

graph TD
    subgraph_Unit_1["Unit #1"]
        A1["Output"] --> B1["+"]
        C1["Output"] --> D1["-"]
        E1["Ground"] --> B1
        B1 --> F1["Load Input"]
        D1 --> G1["Ground"]
        F1 --> H1["Input"]
    end
    subgraph_Unit_2["Unit #2"]
        A2["Output"] --> B2["+"]
        C2["Output"] --> D2["-"]
        E2["Ground"] --> B2
        D2 --> F2["Load Input"]
        G2["Ground"] --> H2["Input"]
    end

Series Connection to Output Positive and Negative Polarity 

graph TD
    subgraph_Unit_1["Unit #1"]
        A1["Output"] --> B1["+"]
        A2["Output"] --> C1["-"]
        D["Ground"] --> E1["Ground"]
        B1 --> F1["Load Input"]
        C1 --> G1["COM Input"]
    end
    subgraph_Unit_2["Unit #2"]
        H1["Output"] --> I1["+"]
        H2["Output"] --> J1["-"]
        K["Ground"] --> L1["Ground"]
        I1 --> M1["Load Input"]
        J1 --> N1["COM Input"]
    end
    Unit_2 -->|Red Line| Unit_1
    Unit_2 -->|Black Line| Unit_2

Note: The output reference ground (COMMON) can be grounded at the power supply side instead of the load, depending on the requirements. Local sensing should be used in this configuration. 

Caution

When connecting the units in series, diodes should be connected across each output to prevent reverse voltage.

Steps

1. Ensure the power is off on both power supplies. 2. Connect the master and slave unit in series as shown above to either increase the voltage output or to create a positive and negative output. Remember that how the units are grounded depends on the configuration of the series connection. 3. Use diodes across the output terminals to prevent reverse voltage at startup or if one of the units unexpectedly shuts down. Ensure the diodes are rated to withstand the voltage and current output of the power supply. 4. Reattach the terminal cover.  Note Ensure load cables have sufficient current capacity. Series Operation

Series	Before using the power supplies in series, the master and slave units need to be configured.
Configuration

1. Configure the OVP, OCP and ULV Page 51 settings for each unit. 2. For each unit, hold the Function key while turning the power on to enter the power on configuration settings. 

Front view of a server rack with ports and indicator lights (no visible text or labels)

3. Make sure each unit is set to Page 111 Independent (F-93 = 0). When using the power supplies in series, each unit is operated individually, and thus no unit is considered the master or slave.

Unit	F-93
Independent	0

4. Cycle the power on the units (reset the power).  Note Configuration settings can be checked for both the master and slave units by pressing the Function key.

Series Operation

Only operate the power supplies in series if the units are configured correctly. 1. Turn on both units. When connected in series unit will only show the voltage and current of their own unit. Unit #1  Unit #2  2. Operation of both units is the same Page 51 as for a single unit. Each unit will only draw as much power as is programmed. Please see the basic operation chapter for details. 3. Press the Output key on each unit to begin. The output LED will become lit. 

CAUTION

Only operate the power supplies in series if using units of the same model number. Only a maximum of 2 units can be used in series.

CAUTION

Ensure that the insulation capacity of the wiring is sufficient when connected in series. See page 32 for insulation capacity and grounding details.

Test Scripts

This section describes how to use the Test function to run, load and save test scripts for automated testing. The Test function is useful if you want to perform a number of tests automatically. The PSU test function can store ten test scripts in memory. Each test script is programmed in a scripting language. For more information on how to create test scripts, please contact GW Instek. - Test script file format from page 86 • Test script settings → from page 86 - Setting the test script settings from page 87 - Load test script from page 88 - Run test script from page 89 - Export test script → from page 90 - Remove test script → from page 91 Test Script File Format

Background	The test files are saved in *.tst file format.
	Each file is saved as tXXX.tst, where XXX is the save file number 001~010.

Test Script Settings

Test Run	Runs the chosen test script from the internal memory. A script must first be loaded into the internal memory before it can be run. See the test function Test Save, below.The script will run as soon as the test function is started.T-01 1~10
Test Copy	Copies a test script from the USB drive to the designated save slot in memory. A script must first be copied into internal memory before it can be run.T-02 1~10 (USB→PSU)
Test Export	Exports a script from the designated memory save slot to the USB drive.T-03 1~10 (PSU→USB)
Test Remove	Deletes the chosen test file from the PSU internal memory.T-04 1~10
Available Test Memory	Shows the amount of space left in memory for tests.T-05 Displays the available memory in bytes.

Setting the Test Script Settings

Steps

The test script settings (T-01\~T-10) are set with the Test key. 1. Press the Test key. The Test key will light up.  2. The display will show T-01 on the left and the memory no. for T-01 on the right. The middle of the display will indicate if the desired file is available in memory or not. Y indicates Yes, N indicates No.  3. Rotate the Voltage knob to change the T setting (Test setting). Test Run T-01 Test Copy T-02 Test Export T-03 Test Remove T-04  4. Rotate the Current knob to choose a memory number. (Excluding T-05) Range 1\~10  5. Press the Voltage knob to complete the setting. 

Exit

Press the Test key again to exit the Test settings. The Test key light will turn off. 

Load Test Script from USB

Overview

Before a test script can be run, it must first be loaded into a one of the 10 memory save slots. Before loading a test script into memory: - Ensure the script file is placed in the root directory. - Ensure the file name number corresponds to the memory number that you wish to save to. For example t001.tst can only be loaded into memory number #01, t002.tst into memory number #02, and so on. - Use the T-05 setting to see how much memory is available in internal memory.

Steps

1. Insert a USB flash drive into the front panel USB-A slot. Ensure the flash drive contains a test script in the root directory.  2. Turn on the power. MS ON (Mass Storage) will be displayed on the screen after a few seconds if the USB drive is recognized. Conversely, MS OFF will be displayed if removed.   If the USB drive is not recognized, check to see that the function settings for F-20 = 1 (page 102). If not, reinsert the USB flash drive. 3. Configure T-02 (Test Copy) to 1\~10 Page 87 (save memory slot) T-02 range 1\~10 4. OK will be displayed when completed. 5. The script will now be available in the memory slot the script was saved to.  Error messages: If you load a file that is not present on the USB drive "Err 002" will be displayed on the display.  Run Test Script

Overview

A test script can be run from one of ten memory slots.

Steps 1. Before a test script can be run, it must first be loaded into one of the 10 memory save slots. Page 88 2. Configure T-01 (Run Test) to 1\~10 (save memory slot no. to run) T-01 range 1\~10 Page 87 3. The test script will automatically start to run.  Note Error messages: If you try to run a test script from an empty memory location “Err 003” will be displayed on the display.  Stop a Test To stop (abort) a running test at any time, press the Test key. TEST STOP will be displayed and the unit will return to normal operation after a few moments. TEST 

Export Test Script to USB

Overview The Export Test function saves a test file to the root directory of a USB flash drive. \- Files will be saved as tXXX.tst where XXX is the memory number 001\~010 from which the test script was exported from. \- Files of the same name on the USB flash drive will be written over. Steps 1. Insert a USB flash drive into the front panel USB-A slot.  2. Turn on the power. MS (Mass Storage) will be displayed on the screen after a few seconds if the USB drive is recognized.   If the USB drive is not recognized, check to see that the function settings for F-20 = 1 (page 101). If not, reinsert the USB flash drive. 3. Configure T-03 (Test Export) to Page 87 1\~10 (save memory slot) T-03 range 1\~10 4. The script will now be copied to the USB flash drive. OK will be displayed when completed.  Error messages: If you try to export a test script from an empty memory location “Err 002” will be displayed on the display.  Remove Test Script

Overview	The Remove Test function will delete a test script from the internal memory.
Steps	1. Select T-04 (Test Remove) and choose which test script to remove from the internal memory.T-04 range 1~10	Page 87

2. The test script will be removed from the internal memory. OK will be displayed when completed.  Note Error messages: If you try to remove a test script from an empty memory location "Err 003" will be displayed on the display. 

CONFIGURATION

Configuration Overview 94

Configuration Table 94 Normal Function Settings 99 Interface Configuration Settings....102 USB / GPIB Settings....102 LAN Settings 103 UART Settings....105 System Settings....106 Power On Configuration Settings 107 Special Function....109 Setting Normal Function Settings 109 Setting Power On Configuration Settings 111

Configuration Overview

Configuration of the PSU power supplies is divided into five different configuration settings: Normal Function, USB/GPIB, LAN, UART, System Configuration Settings, Power ON Configuration and Special Function Settings. Power ON Configuration differs from the other settings in that the settings used with Power ON Configuration settings can only be set during power up. The other configuration settings can be changed when the unit is already on. This prevents some important configuration parameters from being changed inadvertently. Power On Configuration settings are numbered F-90 to F-98 and the other configuration settings are numbered F-00 to F-61, F-70 to F-76 and F-88 to F-89. The Special Function Settings are used for calibration, firmware updated and other special functions; these functions are not supported for end-user use.

Configuration Table

Please use the configuration settings listed below when applying the configuration settings.

Normal Function Settings	Setting	Setting Range
Output ON delay time	F-01	0.00s~99.99s
Output OFF delay time	F-02	0.00s~99.99s
V-I mode slew rate select	F-03	0 = CV high speed priority (CVHS)1 = CC high speed priority (CCHS)2 = CV slew rate priority (CVLS)3 = CC slew rate priority (CVLS)
Rising voltage slew rate	F-04	0.001~0.06V/msec (PSU 6-200)0.001~0.125V/msec (PSU 12.5-120)0.001~0.2V/msec (PSU 20-76)0.001~0.4V/msec (PSU 40-38)0.001~0.6V/msec (PSU 60-25)
Falling voltage slew rate	F-05	0.001~0.06V/msec (PSU 6-200)0.001~0.125V/msec (PSU 12.5-120)0.001~0.2V/msec (PSU 20-76)0.001~0.4V/msec (PSU 40-38)0.001~0.6V/msec (PSU 60-25)
Rising current slew rate	F-06	0.001~2A/msec (PSU 6-200)0.001~1.2A/msec (PSU 12.5-120)0.001~0.76A/msec (PSU 20-76)0.001~0.38A/msec (PSU 40-38)0.001~0.25A/msec (PSU 60-25)
Falling current slew rate	F-07	0.001~2A/msec (PSU 6-200)0.001~1.2A/msec (PSU 12.5-120)0.001~0.76A/msec (PSU 20-76)0.001~0.38A/msec (PSU 40-38)0.001~0,25A/msec (PSU 60-25)
Internal resistance setting	F-08	0~0.03Ω (PSU 6-200)0~0.104Ω (PSU 12.5-120)0~0.263Ω (PSU 20-76)0~1.053Ω (PSU 40-38)0~2.4Ω (PSU 60-25)
Bleeder circuit control	F-09	0 = OFF, 1 = ON
Buzzer ON/OFF control	F-10	0 = OFF, 1 = ON
OCP Delay Time	F-12	0.1 ~ 2.0 sec
Current Setting Limit (I-Limit)	F-13	0 = OFF, 1 = ON
Voltage Setting Limit (V-Limit)	F-14	0 = OFF, 1 = ON
Display memory parameter when recalling (M1, M2, M3)	F-15	0 = OFF, 1 = ON
Auto Calibration Parallel Control	F-16	0 = Disable, 1 = Enable, 2 = Execute Parallel Calibration and set to Enable. Note: Must be a short between each unit before starting.
Measurement Average Setting	F-17	0 = Low, 1 = Middle, 2 = High
Alarm Recovery and Output Status	F-18	0 = Safe Mode, 1 = Force Mode
Lock Mode	F-19	0:Lock Panel, Allow Output OFF1:Lock Panel, Allow Output ON/OFF
USB/GPIB Settings
Show front panel USB status	F-20	0 = None, 1 = Mass Storage
Show rear panel USB status	F-21	0 = None, 1 = Linking to PC
Setup rear USB Speed	F-22	0 = Disable USB, 1 = Full Speed, 2 = Auto Detect Speed
GPIB Address	F-23	0 ~ 30
GPIB Enable/Disable	F-24	0 = Disable GPIB, 1 = Enable GPIB
Show GPIB available status	F-25	0 = No GPIB, 1 = GPIB is available
SCPI Emulation	F-26	0 = GW Instek, 1 = TDK GEN, 2 = Agilent 5700, 3 = Kikusui PWX
LAN Settings
Show MAC Address-1	F-30	0x00~0xFF
Show MAC Address-2	F-31	0x00~0xFF
Show MAC Address-3	F-32	0x00~0xFF
Show MAC Address-4	F-33	0x00~0xFF
Show MAC Address-5	F-34	0x00~0xFF
Show MAC Address-6	F-35	0x00~0xFF
LAN Enable	F-36	0 = OFF, 1 = ON
DHCP	F-37	0 = OFF, 1 = ON
IP Address-1	F-39	000~255
IP Address-2	F-40	000~255
IP Address-3	F-41	000~255
IP Address-4	F-42	000~255
Subnet Mask-1	F-43	000~255
Subnet Mask-2	F-44	000~255
Subnet Mask-3	F-45	000~255
Subnet Mask-4	F-46	0~255
Gateway-1	F-47	0~255
Gateway-2	F-48	0~255
Gateway-3	F-49	0~255
Gateway-4	F-50	0~255
DNS address -1	F-51	0~255
DNS address -2	F-52	0~255
DNS address-3	F-53	0~255
DNS address-4	F-54	0~255
Socket Server Enable/Disable	F-57	0 = Disable, 1 = Enable
Web Server Enable/Disable	F-59	0 = Disable, 1 = Enable
Web Password Enable/Disable	F-60	0 = Disable, 1 = Enable
Web Enter Password	F-61	0000~9999
UART Settings
UART Mode	F-70	0 = Disable UART, 1 = RS232, 2 = RS485
UART Baud Rate	F-71	0 = 1200, 1 = 2400, 2 = 4800, 3 = 9600, 4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200
UART Data Bits	F-72	0 = 7 bits, 1 = 8 bits
UART Parity	F-73	0 = None, 1 = Odd, 2 = Even
UART Stop Bit	F-74	0 = 1 bit, 1 = 2 bits
UART TCP	F-75	0 = SCPI, 1 = TDK (emulation mode)
UART Address (For TDK)	F-76	00 ~ 31
System Settings
Factory Set Value	F-88	0 = None1 = Return to factory default settings
Show Version	F-89	0, 1 = Version2, 3, 4, 5 = Build date (YYYYMMDD)6, 7 = Keyboard CPLD8, 9 = Analog Board CPLDA, B = Analog Board FPGAC, D, E, F = Kernel Build (YYYYMMDD)G, H = Test Command VersionI, J, K, L = Test Command Build (YYYYMMDD)
Power On Configuration Settings*
CV Control	F-90	0 = Control by Local1 = Control by External Voltage2 = Control by External Resistor - Rising3 = Control by External Resistor - Falling4 = Control by Isolated Board
CC Control	F-91	0 = Control by Local1 = Control by External Voltage2 = Control by External Resistor - Rising3 = Control by External Resistor - Falling4 = Control by Isolated Board
Output Status when Power ON	F-92	0 = Safe Mode (Always OFF),1 = Force Mode (Always ON),2 = Auto Mode (Status before last time power OFF)
Master/Slave Configuration	F-93	0 = Independent1 = Master with 1 slave in parallel2 = Master with 2 slaves in parallel3 = Master with 3 slaves in parallel4 = Slave (parallel)
External Output Logic	F-94	0 = High ON, 1 = Low ON
Monitor Voltage Select	F-96	0 = 5V , 1 = 10V
Control Range	F-97	0 = 5V [5kΩ], 1 = 10V [10kΩ]
External Output Control Function	F-98	0 = OFF, 1 = ON
Special Function Settings*
Calibration	F-00	0000 ~ 9999

 \*Note Power On Configuration settings can only be set during power up. They can, however, be viewed under normal operation.

Normal Function Settings

Output ON Delay Time Delays turning the output on for a designated amount of time. The Delay indicator will light when the Delay time is not 0. Note: The Output ON Delay Time setting has a maximum deviation (error) of 20ms. The Output ON Delay Time setting is disabled when the output is set to external control.  F-01 0.00s\~99.99s Output OFF Delay Time Delays turning the output off for a designated amount of time. The Delay indicator will light when the Delay time is not 0. Note: The Output OFF Delay Time setting has a maximum deviation (error) of 20ms. The Output OFF Delay Time setting is disabled when the output is set to external control.  F-02 0.00s\~99.99s

V-I Mode

Selects High Speed Priority or Slew Rate Priority for CV or CC mode. The voltage or current slew rate can only be edited if CC/CV Slew Rate Priority is selected. The ISR indicator will be lit for CC Slew Rate Priority and the VSR indicator will be lit for CV Slew Rate Priority. Note: CC and CV Slew Rate Priority mode are disabled when voltage/current output is set to external control.  

F-03	0 = CV high speed priority
	1 = CC high speed priority
	2 = CV slew rate priority
	3 = CC slew rate priority

Rising Voltage Slew Rate

Sets the rising voltage slew rate. Only applicable if V-I Mode is set to CV Slew Rate Priority. F-04 0.001 \~ max. V/msec

Falling Voltage Slew Rate

Sets the falling voltage slew rate. Only applicable if V-I Mode is set to CV Slew Rate Priority. F-05 0.001 \~ max. V/msec

Rising Current Slew Rate

Sets the rising current slew rate. Only applicable if V-I Mode is set to CC Slew Rate Priority. F-06 0.001 \~ max. A/msec

Falling CurrentSlew Rate	Sets the falling current slew rate. Only applicable if V-I Mode is set to CC Slew Rate Priority.F-07 0.001 ~ max. A/msec
Internal Resistance Settings	Sets the internal resistance of the power supply.F-08 0.000Ω ~ X.XXXΩ(Where X.XXX = Rating Voltage / Rating Current)
Bleeder Control	Bleeder control turns ON/OFF the bleeder resistor. Bleeder resistors discharge the filter capacitors after power is turned off as a safety measure.F-09 0 = OFF, 1 = ON
Buzzer ON/OFF	Turns the buzzer sound on or off. The buzzer is associated with alarm sounds and keypad entry sounds.F-10 0 = OFF, 1 = ON
OCP Delay Time	Sets the OCP delay time. This parameter will delay the amount of time it takes to trigger the over current protection. This function can be useful to prevent current overshoot from triggering OCP.F-12 0.1 ~ 2.0 sec
Current Setting Limit (I-limit)	Turns the current setting limit (I-limit) on or off.Turning this function on will prevent you from accidentally setting the current limit above the set OCP level.F-13 0 = OFF, 1 = ON
Voltage Setting Limit	Turns the voltage setting limit (V-limit) on or off. Turning this function on will prevent you from accidentally setting the voltage limit above the OVP level.
	F-14	0 = OFF 1 = ON
Display Memory Parameter	Displays which memory setting is recalled (M1, M2 or M3) when recalling a setup.
	F-15	0 = OFF, 1 = ON
Auto Calibration Parallel Control	This function performs offset calibration for parallel control. There must be a short between each unit before starting the calibration. See page 77 for details.
	F-16	0 = Disable, 1 = Enable, 2 = Execute Parallel Calibration and set to Enable
Measurement Average Setting	Determines the level of smoothing for the average setting.
	F-17	0 = Low, 1 = Middle, 2 = High
Alarm Recovery and Output Status	Set the output status when OHP, FAN and AC-Fail alarm be cleared.
	F-18	0 = Safe Mode, 1 = Force Mode
Lock Mode	When the front panel is locked, the Lock Mode function determines the behavior of the Output key.
	F-19	0: Lock Panel, Allow Output OFF1: Lock Panel, Allow OutputON/OFF

Interface Configuration Settings

USB / GPIB Settings

Show Front PanelUSB Status	Displays the front panel USB-A port state. This setting is not configurable.
	F-20	0 = None, 1 = Mass Storage
Show Rear PanelUSB Status	Displays the rear panel USB-B port state. This setting is not configurable.F-21 0 = None, 1 = Linking to PC
Setup Rear USB Speed	Sets the rear panel USB speed or turns the rear USB port off.F-22 0 = Disable USB, 1 = Full Speed, 2 = Auto Detect Speed
GPIB Address	Sets the GPIB address.F-23 0 ~ 30
GPIBDisable/Enable	Enable or disables the GPIB port.F-24 0 = Disable GPIB, 1 = Enable GPIB
Show GPIBavailable Status	Shows the status of the GPIB option port.F-25 0 = No GPIB, 1 = GPIB is available
SCPI Emulation	Sets the SCPI emulation mode. The emulation modes allow you to emulate the remote commands of legacy equipment that is used in a test environment.F-26 0 = GW INSTEK, 1 = TDK GEN, 2 = Agilent N5700, 3 = Kikusui PWX

LAN Settings

Show MAC Address-1~6	Displays the MAC address in 6 parts. This setting is not configurable.
	F-30~F-35	0x00~0xFF
LAN	Turns LAN on or off.
	F-36	0 = OFF, 1 = ON
DHCP	Turns DHCP on or off.
	F-37	0 = OFF, 1 = ON
IP Address-1~4	Sets the default IP address. IP address 1~4 splits the IP address into four sections.(F-39 : F-40 : F-41 : F-42)(0~255 : 0~255 : 0~255 : 0~255)
Subnet Mask 1~4	Sets the subnet mask. The subnet mask is split into four parts.(F-43 : F-44 : F-45: F-46)(0~255 : 0~255 : 0~255 : 0~255)
Gateway 1~4	Sets the gateway address. The gateway address is split into 4 parts.(F-47 : F-48 : F-49 : F-50)(0~255 : 0~255 : 0~255 : 0~255)
DNS Address 1~4	Sets the DNS address. The DNS address is split into 4 parts.(F-51 : F-52 : F-53 : F-54)(0~255 : 0~255 : 0~255 : 0~255)
Socket Server Enable/Disable	Enables web socket connections.
	F-57	0 = Disable, 1 = Enable
Web Server Enable/Disable	Turns web server control on/off.
	F-59	0 = Disable, 1 = Enable
Web Password Enable/Disable	Turns a web password on/off.
	F-60	0 = Disable, 1 = Enable
Web Password	Sets the web password.
	F-61	0000 ~ 9999

UART Settings

UART Mode	Sets the UART mode or disables UART.
	F-70	0 = Disable UART, 1 = RS232, 2 = RS485
UART Baud Rate	Sets the UART baud rate.
	F-71	0 = 1200, 1 = 2400, 2 = 4800, 3 = 9600, 4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200
UART Data Bits	Sets the number of data bits.
	F-72	0 = 7 bits, 1 = 8 bits
UART Parity	Sets the parity.
	F-73	0 = None, 1 = Odd, 2 = Even
UART Stop Bit	Sets the number of stop bits.
	F-74	0 = 1 bit, 1 = 2 bits
UART TCP	UART transmission control protocol TCP settings. This is used primarily for multi-unit remote control, see page 168.
	Note: Please refer to the TDK Genesys Series user manual for the TDK control commands.
	F-75	0 = SCPI, 1 = TDK (emulation mode)
UART Address (For TDK)	UART Address (For TDK). This is used to set the address of a unit when using multi-unit remote control, see page 168 for details.
	Note: Please refer to TDK Genesys Series user manual for more information on the UART address.
	F-76	0 ~ 31

System Settings

Factory Default Configuration	Returns the PSU to the factory default settings. See page 183 for a list of the default settings.F-88 0 = None, 1 = Factory Default.
	Displays the PSU version number, build date, keyboard CPLD, analog board CPLD, analog board FPGA, kernel build date, test command version and test command build date.0-XX = Version (1/2)1-XX = Version (2/2)2-XX = Build year (1/2)3-XX = Build year (2/2)4-XX = Build month5-XX = Build day6-XX = Keyboard CPLD (1/2)7-XX = Keyboard CPLD (2/2)8-XX = Analog board CPLD (1/2)9-XX = Analog board CPLD (2/2)A-XX = Analog board FPGA (1/2)B-XX = Analog board FPGA (2/2)C-XX = Kernel build year (1/2)D-XX = Kernel build year (2/2)E-XX = Kernel build monthF-XX = Kernel build dayG-XX = Test command version (1/2)H-XX = Test command version (2/2)I-XX = Test command build year (1/2)J-XX = Test command build year (2/2)K-XX = Test command build monthL-XX = Test command build day
Show Version	F-89

Power On Configuration Settings

CV Control	Sets the constant voltage (CV) control mode between local and external voltage/resistance control. For external voltage control, see page 118 (External Voltage Control of Voltage Output) and page 123 (External Resistance Control of Voltage Output). For Isolated control, see page 140 for details.F-90 0= Control by local1 = Control by external voltage2 = Control by external resistor - rising [IMAGE]3 = Control by external resistor-falling [IMAGE]4 = Control by isolated board
CC Control	Sets the constant current (CC) control mode between local and external voltage/resistance control. For details on external voltage control, see page 121 (External Voltage Control of Current Output) and 125 (External Resistance Control of Current Output). For Isolated control, see page 140 for details.F-91 0 = Control by local1 = Control by external voltage2 = Control by external resistor - rising [IMAGE]3 = Control by external resistor-falling [IMAGE]4 = Control by isolated board
Output Status when Power-ON Output	Sets the power supply to turn the output on or off at power up.

	F-92	0 = Safe Mode (Always OFF),1 = Force Mode (Always ON),2 = Auto Mode (Status before last time Power OFF)
Master/Slave Configuration	Sets the power supply as master or slave. See the parallel/series operation for details, page 68.F-93	0 = Independent1 = Master with 1 slave in parallel2 = Master with 2 slaves in parallel3 = Master with 3 slaves in parallel4 = Slave (parallel)
External Output Logic	Sets the external logic as active high or low for analog control pin 19.F-94	0= High ON, 1 = Low ON
Monitor Voltage Select	Selects the voltage monitor output range.F-96	0 = 5V, 1 = 10V
Control Range	Selects the external control range for external voltage or resistance control.F-97	0 = 5V [5kΩ], 1 = 10V [10kΩ]
External Output Control Function	Set external output control on or off.F-98	0 = OFF, 1 = ON

Special Function

Special Function

The special function setting is used to access calibration, firmware updates and other special functions. The special function setting has a password that is used to access the special function menu. The password used determines which function is accessed. Please see your distributor for details. F-00 0000 \~ 9999

Setting Normal Function Settings

The Normal Function settings (F-01\~F-61, F-70\~F-76) and F-88 \~ F-89 can be easily configured with the Function key. - Ensure the load is not connected. - Ensure the output is off. - Function settings F-90\~98 can only be viewed.  Note Function setting F-89 (Show Version) can only be viewed, not edited. Configuration settings F-90\~ F-98 cannot be edited in the Normal Function settings. Use the Power On Configuration settings. See page 111 for details.

Steps

1. Press the Function key. The function key will light up. Function  2. The display will show F-01 on the left and the configuration setting for F-01 on the right.  3. Rotate the Voltage knob to change the F setting. Range F-00\~F-61, F-70\~F-76, F-88\~F-98  4. Use the Current knob to set the parameter for the chosen F setting.  Press the Voltage knob to save the configuration setting. ConF will be displayed when it is configuring.   Exit Press the Function key again to exit the configuration settings. The Function key light will turn off. 

Setting Power On Configuration Settings

Background

The Power On Configuration settings can only be changed during power up to prevent the configuration settings being inadvertently changed. - Ensure the load is not connected. - Ensure the power supply is off.

Steps

1. Hold the Function key whilst turning the power on. 

Front view of a server rack with ports and indicator lights (no visible text or labels)

2. The display will show F-90 on the left and the configuration setting for F-90 on the right.  3. Rotate the Voltage knob to change the F setting. Range F-90 \~ F-98  4. Use the Current knob to set the parameter for the chosen F setting.  Press the Voltage knob to save the configuration setting. ConF will be displayed when it is configuring.   Exit Cycle the power to save and exit the configuration settings.

ANALOG CONTROL

The Analog Control chapter describes how to control the voltage or current output using an external voltage or resistance, monitor the voltage or current output as well as remotely turning off the output or shutting down the power supply.

Analog Remote Control Overview 114

Analog Control Connector Overview....115 External Voltage Control of Voltage Output 118 External Voltage Control of Current Output 121 External Resistance Control of Voltage Output....123 External Resistance Control of Current Output 125 External Control of Output 128 External control of Shutdown 131

Remote Monitoring 133

External Voltage and Current Monitoring 133 External Operation and Status Monitoring....136 External Trigger In/Out....139

Isolated Analog Control Option 140

Isolated Analog Control Option Specifications....141 0\~5V / 0\~10V Option (PSU-ISO-V)....141 4\~20mA Option (PSU-ISO-I) 141 Isolated Analog Control Option Overview....142 Isolated External Voltage Control of Voltage Output 143 Isolated External Voltage Control of Current Output 146 Isolated External Current Control of Voltage Output 148 Isolated External Current Control of Current Output....151 Isolated External Voltage and Current Monitoring 153

Analog Remote Control Overview

The PSU power supply series have a number of analog control options. The Analog Control connectors are used to control output voltage and current using external voltage or resistance. The power supply output can also be controlled using external switches. There is also an isolated analog control option. The Isolated analog connector is used to control the output voltage and current using an isolated external voltage or current source. Like the analog connector, it can also be used to monitor the current and voltage output as well. Use GW Instek part number PSU-ISO-V for voltage control and monitoring, and use PSU-ISO-I for current control and monitoring. - Analog control connector overview from page 115 • External voltage control of voltage output → from page 118 - External voltage control of current output → from page 121 - External resistance control of voltage output → from page 123 - External resistance control of current output → from page 125 - External control of output from page 128 - External control of the shutdown from page 131

Analog Control Connector Overview

Overview

The Analog Control Connector is a 25 pin connector that can be used with the ARC (analog remote control) kit for wiring connections. The connector is used for all analog remote control. The pins used determine what remote control mode is used.

Pin Assignment


Pin name	Pin number	Description
Status COM1	1	This is the common line for the status signal pins 2 to 3 and 14 to 16.
CV Status	2	This line is on when the PSU is in CV mode (photocoupler open collector output) ^1 .
CC Status	3	This line is on when the PSU is in CC mode (photocoupler open collector output) ^1 .
TRIG IN	4	Trigger signal input line.
Status COM2	5	This is the common line for status signal pins 4 and 17.
N.C.	6	Not connected.
Shutdown	7	Output shutdown control line. The output is turned off when a low level TTL signal is applied.
PRL IN-	8	Negative input line for master-slave parallel operation.
PRL IN+	9	Positive input line for master-slave parallel operation.

Alarm Clear	10 Alarm clear line.Alarms are cleared when a low level TTL signal is applied.
A COM	11 This is the common line for the external signal pins 7 to 10, 12, 13, 19, 21, 24, and 25. It is connected internally to the negative output.
PRL OUT+	12 Positive output line for master-slave parallel operation.
Current Sum	13 Current signal line for master-slave parallel operation.
Alarm Status	14 On when a protection function (OVP, HW OVP, OCP, OHP, FAN, SEN, or AC_FAIL) has been activated or when an output shutdown signal is being applied (open-collector photocoupler output). ^1
PWR ON Status	15 Outputs a low level signal when power is turned on. (open-collector photocoupler output). ^1
OUT ON Status	16 On when the output is on (open-collector photocoupler output). ^1
TRIG OUT	17 Trigger signal output line.
N.C.	18 Not connected.
OUT ON/OFF CONT	19 Output on/off line.On when set to a low level TTL signal, Off when set to a high level TTL signal. (F-94: 1)On when set to a high level TTL signal, Off when set to a low level TTL signal. (F-94: 0)
A COM	20 This is the common line for the external signal pins 7 to 10, 12, 13, 19, 21, 24, and 25. It is connected internally to the negative output.
EXT-V/R CC CONT	21 This line uses an external voltage or resistance to control the output current.External voltage control (F-91: 1); External resistor control (F-91: 2, F-91: 3).0 to 5V or 0 to 5kΩ; 0 % to 100 % of the rated output current (F-97: 0).0 to 10V or 0 to 10kΩ; 0 % to 100 % of the rated output current (F-97: 1).
EXT-V/R CV CONT	22 This line uses an external voltage or resistance to control the output voltage.External voltage control (F-90: 1); External resistor control (F-90: 2, F-90: 3).0 to 5V or 0 to 5kΩ; 0 % to 100 % of the rated output voltage (F-97: 0).0 to 10V or 0 to 10kΩ; 0 % to 100 % of the rated output voltage (F-97: 1).
A COM	23 This the common line for the external signal pins 7 to 10, 12, 13, 19, 21, 24, and 25. It is connected internally to the negative output.
I MON	24 Output current monitor.0 % to 100 % of the rated output current is generated as a voltage between 0V and 5V (F-96: 0) or a voltage between 0V and 10V (F-96: 1).
V MON	25 Output voltage monitor.0 % to 100 % of the rated output voltage is generated as a voltage between 0V and 5V (F-96: 0) or a voltage between 0V and 10V (F-96: 1).

1. Open collector output: 30V max, 8mA max. The common line for the status pins is floating (isolated voltage of 60 V or less). It is isolated from the control circuit.

External Voltage Control of Voltage Output

Background

External voltage control of the voltage output is accomplished using the analog control connector on the rear panel. There are two external voltage control ranges, 0\~5V and 0\~10V, depending on the F-97 configuration. See page 108 for details. For 0\~10V: Output voltage = full scale voltage x (external voltage/10) For 0\~5V: Output voltage = full scale voltage x (external voltage/5)

Connection

When connecting the external voltage source to the analog connector, use shielded or twisted paired wiring.  - Pin23 EXT-V (-) - Pin22 → EXT-V (+) • Wire shield → negative (-) output terminal Connection-alt. shielding If the wire shield needs to be grounded at the voltage source (EXT-V), then the shield cannot also be grounded at the negative (-) terminal output of the PSU power supply. This would short the output.  • Pin23 → EXT-V(-) - Pin22 EXT-V(+) - Wire shield EXT-V ground (GND) Panel operation 1. Connect the external voltage according to the connection diagrams above. 2. Set the F-90 power on configuration setting to 1 (CV control - Ext voltage). \- Be sure to cycle the power after the power on configuration has been set. 3. Press the Function key and confirm the new configuration settings (F-90=1). Page 111  4. Press the Output key. The voltage can now be controlled with the External voltage. 

Note	The input impedance for external voltage control is 1MΩ. Use a stable voltage supply for the external voltage control.
Note	CV and CC Slew Rate Priority are disabled for V-I mode (F-03) when using external voltage control. See the normal function settings on page 99.
CAUTION	Ensure no more than 10.5V(F-97 = 1) or 5.25 (F-97 = 0) volts are input into the external voltage input. Ensure the voltage polarity is correct when connecting the external voltage.

External Voltage Control of Current Output

Background

External voltage control of the current output is accomplished using the analog control connector on the rear panel. There are two external voltage control ranges, 0\~5V and 0\~10V, depending on the F-97 configuration. See page 108 for details. For 0\~10V: Output current = full scale current x (external voltage/10) For 0\~5V: Output current = full scale current x (external voltage/5)

Connection

When connecting the external voltage source to the connectors, use shielded or twisted paired wiring.  - Pin23 EXT-V (-) - Pin21 EXT-V (+) - Wire shield → negative (-) output terminal Connection-alt. shielding If the wire shield needs to be grounded at the voltage source (EXT-V), then the shield cannot also be grounded at the negative (-) terminal output of the PSU power supply. This would short the output.  - Pin23 EXT-V (-) - Pin21 EXT-V (+) - Wire shield EXT-V ground (GND) Steps 1. Connect the external voltage according to the connection diagrams above. 2. Set the F-91 power on configuration setting to 1 (CC control - Ext voltage). Page 111 \- Be sure to cycle the power after the power on configuration has been set. 3. Press the Function key and confirm the new configuration settings (F-91=1). Function  4. Press the Output key. The current can now be controlled with the External voltage. 

Note	The input impedance for external voltage control is 1MΩ.Use a stable voltage supply for the external voltage control.
Note	CV and CC Slew Rate Priority are disabled for V-I mode (F-03) when using external voltage control.See the normal function settings on page 99.
	Ensure the voltage polarity is correct when connecting the external voltage.Ensure no more than 10.5V(F-97 = 1) or 5.25 (F-97 = 0) volts are input into the external voltage input.

External Resistance Control of Voltage Output

Background	External resistance control of the voltage output is accomplished using the analog control connector on the rear panel.
	There are two external resistance control ranges, 0~5kΩ and 0~10kΩ, depending on the F-97 configuration. See page 108 for details.
	The output voltage (0 to full scale) can be controlled with the external resistance rising 0kΩ~5kΩ/0kΩ~10kΩ or falling 5kΩ~0kΩ/10kΩ~0kΩ.
	Rising:For 0kΩ~10kΩ: Output voltage = full scale voltage × (external resistance/10)
	For 0kΩ~5kΩ: Output voltage = full scale voltage × (external resistance/5)Falling:For 10kΩ~0kΩ: Output voltage = full scale voltage × ([10-external resistance]/10)For 5kΩ~0kΩ: Output voltage = full scale voltage × ([5-external resistance]/5)
	The falling resistance configuration is recommended for safety reasons. In the event that the cables become accidentally disconnected (high Ω), the voltage output will drop to zero. Under similar circumstances using the rising resistance configuration, an unexpectedly high voltage would be output.If switches are used to switch between fixed resistances, use switches that avoid creating open circuits. Use short-circuit or continuous resistance switches.
Connection	PSUEXTPin22 → EXT-RPin23 → EXT-RWire shield → negative (-) output terminal
Steps	1. Connect the external resistance according to the connection diagrams above.2. Set the F-90 (CV Control) configuration settings to 2 for Ext-R rising or 3 for Ext-R falling. Page 111

Connection

Steps

	• Be sure to cycle the power after the power on configuration has been set.
	3. Press the Function key and confirm the new configuration settings (F-90=2 or 3).	Function
	4. Press the Output key. The voltage can now be controlled with the External resistance.	Output [TOWW]
	Ensure the resistor(s) and cables used exceed the isolation voltage of the power supply. For example: insulation tubes with a withstand voltage higher than the power supply can be used.When choosing an external resistor ensure the resistor can withstand a high degree of heat.
	CV and CC Slew Rate Priority are disabled for V-I mode (F-03) when using external resistance control. See the normal function settings on page 99.
External Resistance Control of Current Output
Background	External resistance control of the current output is accomplished using the analog connector on the rear panel.There are two external resistance control ranges, 0~5kΩ and 0~10kΩ, depending on the F-97 configuration. See page 108 for details.The output current (0 to full scale) can be controlled with the external resistance rising 0kΩ~5kΩ/0kΩ~10kΩ or falling

External Resistance Control of Current Output

Background

External resistance control of the current output is accomplished using the analog connector on the rear panel.There are two external resistance control ranges, 0~5kΩ and 0~10kΩ, depending on the F-97 configuration. See page 108 for details.The output current (0 to full scale) can be controlled with the external resistance rising 0kΩ~5kΩ/0kΩ~10kΩ or falling

	5kΩ~0kΩ/10kΩ~0kΩ.
	Rising:For 0kΩ~10kΩ: Output current = full scale current × (external resistance/10)
	For 0kΩ~5kΩ: Output current = full scale current × (external resistance/5)
	Falling:For 10kΩ~0kΩ: Output current = full scale current × ([10-external resistance]/10)
	For 5kΩ~0kΩ: Output current = full scale current × ([5-external resistance]/5)
	The falling resistance configuration is recommended for safety reasons. In the event that the cables become accidentally disconnected, the current output will drop to zero (high Ω). Under similar circumstances using the rising configuration, an unexpectedly high current would be output.
	If switches are used to switch between fixed resistances, use switches that avoid creating open circuits. Use short-circuit or continuous resistance switches.
Connection	Pin21 → EXT-RPin23 → EXT-RWire shield → negative (-) output terminal

Connection

Steps

1. Connect the external resistance according to the connection diagrams above. 2. Set the F-91 (CC Control) Page 111 configuration settings to 2 for external resistor rising or to 3 for external resistor falling. \- Be sure to cycle the power after the power on configuration has been set. 3. Press the Function key and confirm the new configuration settings (F-91 = 2 or 3). Function  4. Press the Output key. The current can now be controlled with the External resistance. 

Note

Ensure the resistor(s) and cables used exceed the isolation voltage of the power supply. For example: insulation tubes with a withstand voltage higher than the power supply can be used. When choosing an external resistor ensure the resistor can withstand a high degree of heat.

Note

CV and CC Slew Rate Priority are disabled for V-I mode (F-03) when using external resistance control. See the normal function settings on page 99.

External Control of Output

Background

The output can be turned on or off externally using a switch. The analog control connector can be set to turn the output on from a high or low signal. The voltage across pins 19 and 20 are internally pulled up to +5V ±5% @ 500uA with 10kΩ pull-up resistor. A short (closed switch) produces a low signal. When set to High = On, the output is turned on when the pins 19-20 are open. When Low = On, the output is turned on when pins 19-20 are shorted.

Connection

 - Pin19 Switch - Pin20 Switch - Wire shield → negative (-) output terminal

Steps

1. Connect the external switch according to the connection diagrams above. Set F-94 (External output logic) in Page 111 the power on configuration settings to 0 (High = On) or 1 (Low = On) and set F-98 (External output control function) to 1(On). \- Be sure to cycle the power after setting the power on configuration settings. 2. Press the Function key and confirm the new configuration settings (F-94 = 0 or 1 and F-98=1). Function  3. The switch is now ready to set the output on or off.  When using a switch over long distances, please use a switch relay to extend the line from the coil side of the relay. 

graph LR
    A["Line extension"] --> B["Switch Relay"]
    B --> C["19"]
    B --> D["20"]
    C --> E["Analog connector"]

If a single switch control is to be used for multiple units, please isolate each instrument. This can be achieved by using a relay.  Ensure the cables used and the switch exceed the isolation voltage of the power supply. For example: insulation tubes with a withstand voltage higher than the power supply can be used.  Note Messages: If F-94 = 0 (High = on) and pin 19 is low (0) "MSG 001" will be displayed on the display. If F-94 = 1 (Low = on) and pin 19 is high (1) "MSG 002" will be displayed on the display. Output off (High=on)  Output off (Low=on)   Note Output ON/OFF Delay Time (F-01, F-02) are disabled when the output is set to external control. See the normal function settings on 99 for details.

External control of Shutdown

Background

The output of the power supplies can be configured to shut down via an external switch. The voltage across pins 7 and 20 are internally pulled to +5V ±5% @ 500uA with 10kΩ pull-up resistor. The output is turned off when a low TTL level signal is applied.

Connection

 - Pin7→Switch - Pin20 Switch • Wire shield → negative (-) output terminal

Steps

1. Connect the external switches according to the connection diagrams above. 2. The switch will now shut down the power supply when shorted.  When using a switch over long distances, please use a switch relay to extend the line from the coil side of the relay. 

graph LR
    A["Line extension"] --> B["Switch Relay"]
    B --> C["7"]
    B --> D["20"]
    C --> E["Analog connector"]

If a single switch control is to be used for multiple units, please isolate each instrument. This can be achieved by using a relay.  Ensure the cables and switch used exceed the isolation voltage of the power supply. For example: insulation tubes with a withstand voltage higher than the power supply can be used.

Remote Monitoring

The PSU power supplies have remote monitoring support for current and voltage output. They also support monitoring of operation and alarm status. - External monitoring of output voltage and current → from page 133 - External monitoring of operation mode and alarm status → from page 136 • External Trigger In/Out → from page 139 External Voltage and Current Monitoring

Background	The analog connector is used to monitor the current (IMON) or voltage (VMON) output. An output of 0~10V or 0~5V (depending on the configuration) represents the voltage or current output of 0~ rated current/voltage output. • IMON = (current output/full scale) × 10 or 5. • VMON = (voltage output/full scale) × 10 or 5.
Configuration	The PSU doesn’t need to be configured to use external voltage or current monitoring, however the voltage or current output range does need to be configured. The monitor output voltage can be configured as either 0~10V or 0~5V.

Set F-96 (Monitor Voltage Select) in the power on configuration settings to 0 (5V) or 1 (10V). Page 111 \- Be sure to cycle the power after setting the power on configuration settings. 3. Press the Function key and confirm the new configuration settings (F-96 = 0 or 1). Function  4. An external DMM can now be used to monitor the voltage or current output. VMON Connection  - Pin25 → Pos (+) - Pin23 Neg (-) IMON Connection  - Pin24 Pos (+) - Pin23 Neg (-)  Note Maximum current is 5mA. Ensure the sensing circuit has an input impedance greater than 1MΩ. The monitor outputs are strictly DC and should not be used to monitor analog components such as transient voltage response or ripple etc.  Ensure IMON(pin 24) and VMON(pin 25) are not shorted together. This may cause damage to the unit.

External Operation and Status Monitoring

Background

The analog control connector can also be used to monitor the status operation and alarm status of the instrument. The pins are isolated from the power supply internal circuitry by photo couplers. Status Com1 (Pin 1) and Status Com2 (Pin 5) are photo coupler emitter outputs, whilst pins 2\~3, 14\~17 are photo coupler collector outputs. A maximum of 30V and 8mA can be applied to each pin. The Status Com pin is floating with an isolation voltage of 60V.

Name and Pin		Description
STATUS	1	Common (photo coupler emitter) for status signals 2, 3, 14, 15 and 16.
COM1
CV STATUS	2	Low when CV mode is active.
CC STATUS	3	Low when CC mode is active.
ALM STATUS	14	Low when any of the protection modes are tripped (OVP, OCP, Sense_ALM, OTP_M, AC Fail, OTP_S, Fan_Fail, HW_OVP, and Shutdown). Active low.
PWR ON STATUS	15	Active low.
OUT ON STATUS	16	Low when the output is on.

 Timing diagrams Below are 4 example timing diagrams covering a number of scenarios. Note that pins 14\~16 are all active low. CV MODE: Output turned on The diagram below shows the timing diagram when the output is turned on when the PSU is set to CV mode.  CV MODE: Output turned off The diagram below shows the output status lines when the output is turned off in CV mode.  CC MODE: Output turned on The diagram below shows the timing diagram when the output is turned on when the PSU is set to CC mode.  CC MODE: Output turned off The diagram below shows the output status lines when the output is turned off in CC mode. 

graph TD
    A["CV status"] --> B["H"]
    C["CC status"] --> D["L"]
    E["Output status"] --> F["H"]
    G["Output status"] --> H["L"]

External Trigger In/Out

Background

Pin 4 is used for the external trigger input and pin 17 is used as the trigger output. Pin 5 is the common for both pins.

Name and Pin		Description
STATUS	5	Common (photo coupler emitter) for trigger pins 4, 17.
COM2
TRIG IN	4	External trigger input
TRIG OUT	17	The TRIG OUT signal is held high by an internal 330Ω resistor. The trigger output is pulsed low for each trigger.


Isolated Analog Control Option

The PSU power supplies can use the isolated analog connector for external control and remote monitoring. - Isolated analog control option specifications 141 - Isolated analog control option overview 142 - Isolated external voltage control of current output 143 - Isolated external current control of voltage output 148 - Isolated external current control of current output 151 - Isolated external voltage and current monitoring 153

Isolated Analog Control Option Specifications

0\~5V / 0\~10V Option (PSU-ISO-V)

External voltage control output voltage	%	Accuracy and linearity: ±1% of rated output voltage
External voltage control output current	%	Accuracy and linearity: ±1% of rated output current
Temperature coefficient	ppm/°C	100ppm/°C of rated voltage or current, after a 30 minute warm-up
Programming input impedance	Ohm	1M
Absolute maximum voltage	V	0~10.5V
Output voltage monitor	%	Accuracy: ±1.5%
Output current monitor	%	Accuracy: ±1.5%
Monitor output impedance	Ohm	100

4\~20mA Option (PSU-ISO-I)

External current control output voltage	%	Accuracy and linearity: ±1% of rated output voltage
External current control output current	%	Accuracy and linearity: ±1% of rated output current
Temperature coefficient	ppm/°C	200ppm/°C of rated voltage or current, after a 30 minute warm-up.
Programming input impedance	Ohm	50
absolute maximum voltage	mA	4~21mA
Output voltage monitor	%	Accuracy: ±1.5%
Output current monitor	%	Accuracy: ±1.5%

Isolated Analog Control Option Overview

Overview		The Isolated Analog Connectors are 8 pin sockets that are optically isolated from the power supply, allowing inputs with ground references that differ to the power supply. The isolated options include either an isolated voltage (0~5V/0~10V) interface or an isolated current (4~20mA) interface. Only one type of isolated interface can be used at any one time. The pins used determine what remote control mode is used.
Note		The GPIB Option (PSU-GPIB), the isolated voltage option (PSU-ISO-V) and the isolated current option (PSU-ISO-I) all use the same option slot, meaning that only one of the three options can be used at any one time.
Pin Assignment		Isolated Voltage Connector Isolated Current Connector
Pin name	Pin number	Description
SHIELD	1	Shield, connected internally to the chassis of the power supply.
+VPROG_ISO	2	Output Voltage programming input.
+IPROG_ISO	3	Output Current programming input.
GND_ISO	4	Ground for programming signals.
GND_ISO	5	Ground for programming signals.
+VMON_ISO	6	Output Voltage monitoring output.
+IMON_ISO	7	Output Current monitoring output.
Shield	8	Shield, connected internally to the chassis of the power supply.

Isolated External Voltage Control of Voltage Output

Background

Voltage control of the voltage output uses the isolated voltage option (PSU-ISO-V). A voltage of 0\~5V or 0\~10V is used to control the full scale voltage of the instrument, where: For 0\~5V: Output voltage = full scale voltage × (external voltage/5) For 0\~10V: Output voltage = full scale voltage × (external voltage/10)

Connection

When connecting the external voltage source to the isolated voltage option, use shielded or twisted paired wiring.  • Pin4(GND\_ISO) → EXT-V (-) • Pin2(+VPROG\_ISO) → EXT-V (+) • Pin 1 or 8 (Shield) → Wire shield Connection-alt. shielding If the wire shield needs to be grounded at the voltage source (EXT-V), then it can be connected as shown below.  • Pin4(GND\_ISO) → EXT-V (-) • Pin2(+VPROG\_ISO) → EXT-V (+) - EXT-V ground (GND) Wire shield Panel operation 1. Connect the external voltage according to the connection diagrams above. 2. Set the F-90 power on configuration setting to 4 (Control by Isolated Board). Page 111 3. Set the F-97 power on configuration setting to 0 (0\~5V control range) or to 1 (0\~10V control range). Page 111 \- Be sure to cycle the power after the power on configuration has been set. 4. Press the Function key and confirm the new configuration settings (F-90=4, F-97=0 or 1). Function 

	5. Press the Output key. The voltage can now be controlled with the isolated external voltage control.
!Note	The input impedance for isolated external voltage control is 1MΩ.Use a stable voltage supply for the external voltage control.
!Note	CV and CC Slew Rate Priority are disabled for V-I mode (F-03) when using external voltage control.See the normal function settings on page 99.
!CAUTION	Ensure the voltage polarity is correct when connecting the external voltage.Ensure no more than 10.5V (for the 0~10V setting) or 5.25V (for the 0~5V setting) are to be input into the isolated voltage input.

Isolated External Voltage Control of Current Output

Background	Voltage control of the current output uses the isolated voltage option (PSU-ISO-V). A voltage of 0~5V or 0~10V is used to control the full scale current of the instrument, where:For 0~5V: Output current = full scale current × (external voltage/5)For 0~10V: Output current = full scale current × (external voltage/10)
Connection	When connecting the external voltage source to the isolated voltage option, use shielded or twisted paired wiring.Pin4(GND_ISO) → EXT-V (-)Pin3(+IPROG_ISO) → EXT-V (+)EXT-V ground (Shield) → Wire shield

ANALOG CONTROL

Connection-alt. shielding If the wire shield needs to be grounded at the voltage source (EXT-V), then it can be connected as shown below.

PSUEX1

+	3	Isolated Voltage
-	4	Option

2 core shielded wire or twisted pair Output Terminal • Pin4(GND\_ISO) → EXT-V (-) • Pin3(+IPROG\_ISO) → EXT-V (+) - Wire shield EXT-V ground (GND) Steps 1. Connect the external voltage according to the connection diagrams above. 2. Set the F-91 power on configuration setting to 4 (Control by Isolated Board). Page 111 3. Set the F-97 power on configuration setting to 0 (0\~5V control range) or 1 (0\~10V control range). Page 111 \- Be sure to cycle the power after the power on configuration has been set. 4. Press the Function key and confirm the new configuration settings (F-91=4, F-97=0 or 1).

	5. Press the Output key. The current can now be controlled with the isolated external voltage control.	Output
	⚠️Note	The input impedance of isolated external voltage control is 1MΩ.Use a stable voltage supply for the external voltage control.
	⚠️Note	CV and CC Slew Rate Priority are disabled for V-I mode (F-03) when using external voltage control.See the normal function settings on page 99.
	⚠️CAUTION	Ensure the voltage polarity is correct when connecting the external voltage.Ensure no more than 10.5V (for the 0~10V setting) or 5.25V (for the 0~5V setting) are input into the external voltage input.

Isolated External Current Control of Voltage Output

Background Current control of the voltage output uses the isolated current option (PSU-ISO-I). A current of 4\~20mA is used to control the full scale voltage of the instrument, where: Output voltage = full scale voltage × ((external current-4mA)/16mA)

Connection

When connecting the external current source to the isolated analog option, use shielded or twisted paired wiring.  • Pin4(GND\_ISO) → EXT-I (-) • Pin2(+VPROG\_ISO) → EXT-I (+) • Pin 1 or 8 (Shield) → Wire shield

Connection-alt. shielding

If the wire shield needs to be grounded at the current source (EXT-I), then it can be connected as shown below.  • Pin4(GND\_ISO) → EXT-I (-) • Pin2(+VPROG\_ISO) → EXT-I (+) - EXT-I ground (GND) Wire shield

Panel operation

1. Connect the external current source according to the connection diagrams above. 2. Set the F-90 power on configuration setting to 4 (Control by Isolated Board). Page 111 3. Set the F-97 power on configuration setting to 1. • Be sure to cycle the power after the power on configuration has been set. 4. Press the Function key and confirm the new configuration settings (F-90=4, F-97=1). Function 5. Press the Output key. The voltage can now be controlled with the isolated external current control. Use a stable current supply for the external voltage control. CV and CC Slew Rate Priority are disabled for V-I mode (F-03) when using external current control. See the normal function settings on page 99. Ensure the polarity is correct when connecting the external current. Ensure no more than 21mA are input into the external isolated current input.     

Isolated External Current Control of Current Output

Background

Current control of the current output uses the isolated current option (PSU-ISO-I). A current of 4\~20mA is used to control the full scale current of the instrument, where: Output current = full scale current × ((external current - 4mA)/16mA)

Connection

When connecting the external current source to the isolated current option, use shielded or twisted paired wiring.  • Pin4(GND\_ISO) → EXT-I (-) • Pin3(+IPROG\_ISO) → EXT-I (+) - Pin 1 or 8 (Shield) Wire shield Connection-alt. shielding If the wire shield needs to be grounded at the current source (EXT-I), then it can be connected as shown below.  - Pin4(GND\_ISO) EXT-I (-) • Pin3(+IPROG\_ISO) → EXT-I (+) - Wire shield EXT-I ground (GND) Steps 1. Connect the external current according to the connection diagrams above. 2. Set the F-91 power on configuration setting to 4 (Control by Isolated Board). Page 111 3. Set the F-97 power on configuration setting to 1. \- Be sure to cycle the power after the power on configuration has been set. 4. Press the Function key and confirm the new configuration settings (F-91=4, F-97=1). Function  5. Press the Output key. The current can now be controlled with the External current. 

Note	Use a stable current source for the external current control.
Note	CV and CC Slew Rate Priority are disabled for V-I mode (F-03) when using external voltage control.See the normal function settings on page 99.
CAUTION	Ensure the polarity is correct when connecting the external voltage.Ensure no more than 21mA are input into the external current input.

Isolated External Voltage and Current Monitoring

Background	The isolated analog connector can also be used to monitor the current (IMON) or voltage (VMON).
	For the isolated voltage option, an output of 0~5V or 0~10V represents the voltage or current output of 0~ rated current/voltage output.· IMON = (current output/full scale) × (5 or 10)· VMON = (voltage output/full scale) × (5 or 10)
	For the isolated current option, an output of 4~20mA represents the voltage or current output of 0~ rated current/voltage output.· IMON = ((current output/full scale) × 16mA) + 4mA· VMON = ((voltage output/full scale) × 16mA) + 4mA

VMON Connection

 - Pin6 (+VMON\_ISO) → Pos (+) - Pin5 (GND\_ISO) Neg (-)

IMON Connection

 - Pin7(+IMON\_ISO) Pos (+) • Pin5(GND\_ISO) → Neg (-)

Steps

1. Connect the external voltage or external current source to the isolated voltage or current option according to the connection diagrams above. 2. If using the isolated voltage option, Page 111 set the F-96 settings to 0 (0\~5V) or 1 (0\~10V) to choose the VMON or IMON output range. 3. If using the isolated current option, Page 111 set the F-96 power on configuration setting to 1 to set the VMON and IMON output to 4mA \~ 20mA. - Be sure to cycle the power after the power on configuration has been set. 4. Press the Function key and confirm the new configuration settings (F-96=0 or 1).  5. The current or voltage output can now be monitored using the isolated voltage or current option.  The monitor outputs are strictly DC and should not be used to monitor analog components such as transient voltage response or ripple etc.

COMMUNICATION

INTERFACE

This chapter describes basic configuration of IEEE488.2 based remote control. For a command list, refer to the programming manual, downloadable from GW Instek website, www.gwinstek.com

Interface Configuration ....157

USB Remote Interface 157 Configuration....157 Function Check 158 GPIB Remote Interface....159 Configuration....159 GPIB Function Check....160 UART Remote Interface 164 Configure UART....164 UART Function Check....167 Multiple Unit Connection Using Local RS485 Bus 168 Multi-Unit Function Check....170 Configure Ethernet Connection....172 Web Server Configuration 172 Web Server Remote Control Function Check 173 Sockets Server Configuration....175 Socket Server Function Check 176

Interface Configuration

USB Remote Interface Configuration

USB Configuration	PC side connector	Type A, host
	PSU side connector	Rear panel Type B, slave
	Speed	1.1/2.0 (full speed/high speed)
	USB Class	CDC (communications device class)

Steps

1. Connect the USB cable to the rear panel USB B port.  2. Change the Rear panel-USB (F-22) setting to 2 (Auto Detect Speed) or 1 (USB Full Speed). Page 109  Note If you are not using the rear panel USB device port, set F-22 to 0 (Disable USB). Page 109 3. The RMT indicator will turn on when a remote connection has been established.  RMT indicator Function Check

Functionality check	Invoke a terminal application such as Realterm.To check the COM port No., see the Device Manager in the PC. For WinXP; Control panel → System → Hardware tab.
	Run this query command via the terminal application after the instrument has been configured for USB remote control (page 157).*idn?This should return the Manufacturer, Model number, Serial number, and Firmware version in the following format.GW-INSTEK,PSU40-38,TW123456,T0.01.12345678Manufacturer: GW-INSTEKModel number : PSU40-38Serial number : TW123456Firmware version : T0.01.12345678
Note	For further details, please see the programming manual, available on the GW Instek web site @ www.gwinstek.com.

GPIB Remote Interface

Configuration

To use GPIB, the optional GPIB option (GW Instek part number: PSU-GPIB) must be installed. This is a factory installed option and cannot be installed by the end-user. Only one GPIB address can be used at a time.

Configure GPIB

1. Ensure the PSU is off before proceeding. 2. Connect a GPIB cable from a GPIB controller to the GPIB port on the PSU. 3. Turn the PSU on. 4. Press the Function key to enter the Page 109 Normal configuration settings. 5. Set the following GPIB settings. $$ F - 2 4 = 1 $$ Enable the GPIB port $$ F - 2 3 = 0 \sim 3 0 $$ Set the GPIB address (0\~30) 6. Check to see that the GPIB option is detected by the PSU. The F-25 setting indicates the GPIB port status. $$ F - 2 5 = 1 $$ Indicates that the GPIB port is available. $$ F - 2 5 = 0 $$ Indicates that the GPIB port is not detected. 7. The RMT indicator will turn on when a remote connection has been established.  RMT indicator

GPIB constraints

- Maximum 15 devices altogether, 20m cable length, 2m between each device - Unique address assigned to each device - At least 2/3 of the devices turned On - No loop or parallel connection

GPIB Function Check

Background

To test the GPIB functionality, National Instruments Measurement and Automation Explorer can be used. This program is available on the NI website, www.ni.com., via a search for the VISA Run-time Engine page, or "downloads" at the following URL, http://www.ni.com/visa/

Requirements

Operating System: Windows XP, 7, 8 Functionality check 1. Start the NI Measurement and Automation Explorer (MAX) program. Using Windows, press: Start>All Programs>National Instruments>Measurement & Automation  2. From the Configuration panel access; My System>Devices and Interfaces>GPIB 3. Press Scan for Instruments.  4. Select the device (GPIB address of PSU) that now appears in the System>Devices and Interfaces > GPIB-USB-HS "GPIBX" node. 5. Click on the VISA Properties tab on the bottom. 6. Click Open Visa Test Panel.  7. Click on Configuration. 8. Click on the GPIB Settings tab and confirm that the GPIB settings are correct.  9. Click on the I/O Settings tab. 10. Make sure the Enable Termination Character check box is checked, and the terminal character is \n (Value: xA). 11. Click Apply Changes.  12. Click on Input/Output. 13. Click on the Basic/IO tab. 14. Enter \*IDN? in the Select or Enter Command drop down box. 15. Click Query. 16. The \*IDN? query will return the Manufacturer, model name, serial number and firmware version in the dialog box. GW-INSTEK,PSU40-38, TW123456,T0.02.20131205   Note For further details, please see the programming manual, available on the GW Instek web site @ www.gwinstek.com.

UART Remote Interface

Configure UART

Overview

The PSU uses the IN & OUT ports for UART communication coupled with RS232 (GW Part number PSU-232) or RS485 adapters (GW part number PSU-485) The pin outs for the adapters are shown below.

PSU-232 RS232 cable with DB9 connector	DB-9 Connector		Remote IN Port		Remarks
	Pin No.	Name	Pin No.	Name
	Housing	Shield	Housing	Shield
	2	RX	7	TX	Twisted pair
	3	TX	8	RX
	5	SG	1	SG

GW INSTEK

COMMUNICATION INTERFACE

PSU-485 RS485 cable with DB9 connector

DB-9 Connector		Remote IN Port		Remarks
Pin No.	Name	Pin No.	Name
Housing	Shield	Housing	Shield
9	TXD -	6	RXD -	Twisted pair
8	TXD +	3	RXD +
1	SG	1	SG
5	RXD -	5	TXD -	Twisted pair
4	RXD +	4	TXD +

Steps 1. Connect the RS232 serial cable (included in the PSU-232 kit) or RS485 serial cable (included in the PSU-485 kit) to the (Remote IN port) on the rear panel.  Connect the other end of the cable to the PC. 2. Press the Function key to enter the Page 109 Normal configuration settings.

	F-76 = 00~31	UART address if TDK is selected for F-75.
	3. The RMT indicator will turn on when a remote connection has been established.
Note	If TDK (emulation mode) is selected for F-75, the TDK GENESYS legacy commands should be used for remote commands. See the TDK Genesys user manual for details.

UART Function Check

Functionality check	Invoke a terminal application such as Realterm.To check the COM port No, see the Device Manager in the PC. For WinXP; Control panel → System → Hardware tab.
	Run this query command via the terminal application after the instrument has been configured for either RS232 or RS485 remote control (page 164).*idn?This should return the Manufacturer, Model number, Serial number, and Firmware version in the following format:GW-INSTEK,PSU40-38,,T0.01.12345678Manufacturer: GW-INSTEKModel number : PSU40-38Serial number : TW123456Firmware version : T0.01.12345678
Note	For further details, please see the programming manual, available on the GW Instek web site @www.gwinstek.com.

Multiple Unit Connection Using Local RS485 Bus

The PSU power supplies can have up to 31 units daisy-chained together using the 8 pin connectors (IN OUT ports) on the rear panel. The first unit in the chain is remotely connected to a PC using RS232 or RS485. Each subsequent unit is daisy-chained to the next using an RS485 local bus. The OUT port on the last terminal must be terminated by the end terminal connector. Only the TDK GENESYS legacy commands can be used when using multiple units over the local RS485 bus, SCPI commands cannot be used. When using the TDK commands, each unit is assigned a unique address and can then be individually controlled from the host PC. When using SCPI commands via RS232/RS485, remote commands can only be used to control the master unit.

Operation

1. Connect the first unit's IN port to a PC via RS232 or RS485. • Use the serial cables supplied in the PSU-232 or PSU-485 connection kit. 2. Connect the OUT port on the first unit to the IN port of the second unit using the serial link 4. Terminate the OUT port of the last unit with the end terminal connector included in the PSU-232 or PSU-485 connection kit. 5. Press the Function key to enter the Page 109 Normal configuration settings for the master unit. Set the following settings:

F-70 = 1 or 2	Configure the master unit as you normally would for RS232 or RS485 remote control, see page 164.
F-71 = 0~7	Set the baud rate (set all units the same). See page 164.
F-72 = 1	Set to 8 data bits.
F-73 = 0	Parity to none.
F-74 = 1	1 Stop bit.
F-75 = 1	Set the UART TCP to TDK (emulation mode).
F-76 = 00~31	Set the address of the master unit. It must be a unique address identifier.

6. Press the Function key to enter the Page 109 Normal configuration settings for the slave(s). Set the following settings:

F-70 = 2	Set the slave unit to RS485.
	Set the baud rate (make all units, including the master, the same baud). See page 164.
F-71 = 0~7
F-72 = 1	Set to 8 data bits.
F-73 = 0	Parity to none.
F-74 = 1	1 Stop bit.
F-75 = 1	Set the UART TCP to TDK (emulation mode).

$$ F - 7 6 = 0 0 \sim 3 1 $$ Set the address of each slave to a unique address identifier 7. Multiple units can now be operated at the same time. See the programming manual or see the function check below for usage details. Serial link cable with RJ-45 shielded connectors from PSU-232 or PSU-485 connection kit

8 Pin Connector (IN)		8 Pin Connector (OUT)
Pin No.	Name	Pin No.	Name
Housing	Shield	Housing	Shield
1	SG	1	SG
6	TXD -	6	TXD -
3	TXD +	3	TXD +
5	RXD -	5	RXD -
4	RXD +	4	RXD +

Multi-Unit Function Check

Functionality check Invoke a terminal application such as Realterm. To check the COM port No, see the Device Manager in the PC. For WinXP; Control panel → System → Hardware tab. Below shows an example using the TDK GENESYS legacy commands. TDK Query When using the TDK GENESYS legacy commands, each unit can be individually controlled using the unique address identifiers. For this function check, we will assume that the master unit is assigned to address 8, while a slave is assigned address 11. Run this query command via the terminal application after the instruments have been configured for multi-unit control. See page 168. ADR 8 IDN? The identity string for the Master unit will be returned: GW-INSTEK,PSU40-38,,T0.01.12345678 Type the following: ADR 11 IDN? The identity string for the slave with address 11 will be returned: GW-INSTEK,PSU40-38,,T0.01.12345678 Note: TDK commands do not use LF (line feed) codes to terminate commands. See the TDK Genesys user manual for further information.  Note For further details, please see the programming manual, available on the GW Instek web site @ www.gwinstek.com.

Configure Ethernet Connection

The Ethernet interface can be configured for a number of different applications. Ethernet can be configured for basic remote control or monitoring using a web server or it can be configured as a socket server. The PSU series supports both DHCP connections so the instrument can be automatically connected to an existing network or alternatively, network settings can be manually configured. Ethernet configuration Parameters For details on how to configure the Ethernet settings, please see the configuration chapter on page 103. MAC Address (display only) LAN Enable/Disable DHCP IP Address Enable/Disable Subnet Mask Gateway DNS Address Sockets Server Enable/Disable Web Server Enable/Disable Web Password Enable/Disable Web Enter Password

Web Server Configuration

Configuration This configuration example will configure the PSU as a web server and use DHCP to automatically assign an IP address to the PSU. 1. Connect an Ethernet cable from the network to the rear panel Ethernet port.  2. Press the Function key to enter the Page 109 Normal configuration settings. Set the following LAN settings:

F-36 = 1	Turn LAN on
F-37 = 1	Enable DHCP
F-59 = 1	Turn the web server on
F-60 = 0 or 1	Set to 0 to disable web password, set to 1 to enable web password
F-61 = 0000~9999	Set the web password

3. The LAN indicator will turn on when a network cable is plugged in.  LAN indicator  Note It may be necessary to cycle the power or refresh the web browser to connect to a network.

Web Server Remote Control Function Check

Functionality check Enter the IP address of the power supply in a web browser after the instrument has been configured as a web server (page 172). The web server allows you to monitor the function settings of the PSU. You can check the IP address by checking F-39 to F-42. F-39 = AAA IP Address part 1 of 4 F-40 = BBB IP Address part 2 of 4 F-41 = CCC IP Address part 3 of 4 F-42 = DDD IP Address part 4 of 4 http://AAA.BBB.CCC.DDD The web browser interface appears.

GWINSTEK Made to Measure	Visit Our Site	Support | Contact Us
Welcome Page	PSU Series Web Control Pages	System Information
		Manufacturer:	GW-INSSTEK
Network Configuration	Thanks For Your Using.	Serial Number
	Use the left menu to select the features you need.	Description:	OW-INSSTEK.PSU40-38
Analog Control	More How-to Please refer to user manual.	Firmware Version:	T0.02.20131205
		Hostname	P-
Figure of Dimensions		IP Adress	172.16.22.134
		Subset Mask	255.255.128.0
		Gateway	172.16.0.254
Operating Area		DNS	172.16.1.252
		MAC Adress	02:80:ad:20:31 h2
		DHCP State	ON

Copyright 2011 © Good Will Instrument Co., Ltd All Rights Reserved. The web browser interface allows you to access the following: • Network configuration settings - Analog control pinouts & usage - PSU dimensions - Operating area diagram  Note For further details, please see the programming manual, available on the GW Instek web site @ www.gwinstek.com.

Sockets Server Configuration

Configuration

This configuration example will configure the PSU socket server. The following configuration settings will manually assign the PSU an IP address and enable the socket server. The socket server port number is fixed at 2268. 1. Connect an Ethernet cable from the network to the rear panel Ethernet port.  2. Press the Function key to enter the Page 109 Normal configuration settings. Set the following LAN settings:

F-36 = 1	Enable LAN
F-37 = 0	Disable DHCP
F-39 = 172	IP Address part 1 of 4
F-40 = 16	IP Address part 2 of 4
F-41 = 5	IP Address part 3 of 4
F-42 = 133	IP Address part 4 of 4
F-43 = 255	Subnet Mask part 1 of 4
F-44 = 255	Subnet Mask part 2 of 4
F-45 = 128	Subnet Mask part 3 of 4
F-46 = 0	Subnet Mask part 4 of 4
F-43 = 172	Gateway part 1 of 4
F-44 = 16	Gateway part 2 of 4
F-45 = 21	Gateway part 3 of 4
F-46 = 101	Gateway part 4 of 4
F-57 = 1	Enable Sockets

Socket Server Function Check

Background	To test the socket server functionality, National Instruments Measurement and Automation Explorer can be used. This program is available on the NI website, www.ni.com., via a search for the VISA Run-time Engine page, or “downloads” at the following URL, http://www.ni.com/visa/
Requirements	Operating System: Windows XP, 7, 8

Functionality check

1. Start the NI Measurement and Automation Explorer (MAX) program. Using Windows, press: Start>All Programs>National Instruments>Measurement & Automation  2. From the Configuration panel access; My System>Devices and Interfaces>Network Devices 3. Press Add New Network Device>Visa TCP/IP Resource...  4. Select Manual Entry of Raw Socket from the popup window.  5. Enter the IP address and the port number of the PSU. The port number is fixed at 2268. 6. Click the Validate button. 7. A popup will appear if a connection is successfully established. 8. Click Next.  9. Next configure the Alias (name) of the PSU connection. In this example the Alias is: PSU\_DC1 10. Click finish.  11. The IP address of the PSU will now appear under Network Devices in the configuration panel. Select this icon now. 12. Click Open VISA Test Panel.  13. Click the Configuration icon, 14. Click on I/O Settings. 15. Make sure the Enable Termination Character check box is checked, and the terminal character is \n (Value: xA). 16. Click Apply Changes.  17. Click the Input/Output icon. 18. Enter \*IDN? in the Select or Enter Command dialog box if it is not already. 19. Click the Query button. 20. The \*IDN? query will return the Manufacturer, model name, serial number and firmware version in the dialog box. GW-INSTEK, PSU40-38, TW123456, T0.02.20131205   Note For further details, please see the programming manual, available on the GW Instek web site @ www.gwinstek.com.

FAQ

• How often should the power supply be calibrated? • The OVP voltage is triggered earlier than expected. • Can I combine more than 1 cable together for the output wiring? • The accuracy does not match the specification. How often should the power supply be calibrated? The PSU should be calibrated by an authorized service center at least every 2 years. For details regarding calibration, see your local dealer or GWInstek at www.gwinstek.com / [e-mail]. The OVP voltage is triggered earlier than expected. When setting the OVP voltage, take into account the voltage drop from the load cables. As the OVP level is set from the output terminals and not the load terminals, the voltage at the load terminals may be slightly lower. Can I combine more than 1 cable together for the output wiring? Yes. Cables can be used together (in parallel) if the current capacity of a single cable is insufficient. However the withstand voltage should also be taken into account. Ensure the cables are twisted together and are the same length. The accuracy does not match the specification. Make sure the device is powered On for at least 30 minutes, within +20°C\~+30°C. This is necessary to stabilize the unit to match the specification. For more information, contact your local dealer or GWInstek at www.gwinstek.com / [e-mail].

APPENDIX

PSU Factory Default Settings

The following default settings are the factory configuration settings for the power supply. For details on how to return to the factory default settings, see page 47.

Initial Settings	Default Setting
Output	Off
LOCK	0 (Disabled)
Voltage	0V
Current	0A
OVP	1.1 X Vrate
OCP	1.1 X Irate
Normal Function
Settings	Setting	Default Setting
Output ON delay time	F-01	0.00s
Output OFF delay time	F-02	0.00s
V-I mode slew rate select	F-03	0 = CV high speed priority (CVHS)
Internal resistance setting	F-08	0.000Ω
Bleeder circuit control	F-09	1 = ON
Buzzer ON/OFF control	F-10	1 = ON
OCP Delay Time	F-12	0.1 sec
Current Setting Limit	F-13	0 = OFF
Voltage Setting Limit	F-14	0 = OFF
Display Memory parameter when recalling	F-15	0 = OFF
Auto Calibration Parallel Control	F-16	0 = Disable
Measurement Average Setting	F-17	0 = Low
Alarm Recovery and Output Status	F-18	0 = Safe Mode
Lock Mode	F-19	0:Lock Panel, Allow Output OFF
Setup Rear USB Speed	F-22	2 = Auto Detect Speed
GPIB address	F-23	8
GPIB Enable/Disable	F-24	1 = Enable GPIB
SCPI Emulation	F-26	0 = GW Instek
LAN setting
LAN Enable	F-36	1 = ON
DHCP	F-37	1 = ON
Power On Configuration
Socket Server Enable/Disable	F-57	1 = Enable
Web Server Enable/Disable	F-59	1 = Enable
Web Password Enable/Disable	F-60	1 = Enable
UART Mode	F-70	1 = RS232
UART Baudrate	F-71	7 = 115200
UART Data Bits	F-72	1 = 8 bits
UART Parity	F-73	0 = None
UART Stop Bit	F-74	0 = 1 bit
UART TCP	F-75	0 = SCPI
UART Address (For TDK)	F-76	31
CV Control	F-90	0 = Control by local
CC Control	F-91	0 = Control by local
Output Status when Power ON	F-92	0 = Safe Mode (Always OFF)
Master/Slave Configuration	F-93	0 = Independent
External Output Logic	F-94	0 = High ON
Monitor Voltage Select	F-96	0 = 5V
Control Range	F-97	0 = 5V[5kΩ]
External Output Control Function	F-98	0 = OFF

Error Messages & Messages

The following error messages or messages may appear on the PSU screen during operation.

Error Messages	Description
OHP	Master & slave board over temperature protection in PSU
OHP1	Master board over temperature protection in PSU
OHP2	Slave board over temperature protection in PSU
ALM SENS	Sense Alarm
HW OVP	Hardware over voltage protection
AC	AC fail
OVP	Over voltage protection
OCP	Over current protection
FAN FAIL	Fan failure
SHUT DOWN	Force shutdown
Err 001	USB mass storage is not present
Err 002	No (such)file in USB mass storage
Err 003	Empty memory location
Err 004	Slave PSU error status

Normal Messages	Description
MSG 001	External control of output. Output off (F-94=0, High=on)
MSG 002	External control of output. Output off (F-94=1, Low=on)

Communication
Interface Messages	Description
USB ON	Rear USB port connected to PC
USB OFF	Rear USB port disconnected from PC
MS ON	Mass storage plugged into front USB port
MS OFF	Mass storage removed from front USB port

LED ASCII Table Character Set

Use the following table to read the LED display messages.

0

1

2

3

4

5

6

7

8

9

A

B

C

D

0

1

2

3

4

5

6

7

8

9

A

b

C

d

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

E

F

G

H

C

U

E

L

n

o

P

q

r

S

T

U

V

W

X

Y

Z

( )

+

-

,

S

t

U

8

U

F

y

=

c

p

+

-

-

PSU Specifications

The specifications apply when the PSU is powered on for at least 30 minutes. Output

Model	PSU	6-200	12.5-120	20-76	40-38	60-25
Rated Output Voltage (*1)	V	6	12.5	20	40	60
Rated Output Current (*2)	A	200	120	76	38	25
Rated Output Power	W	1200	1500	1520	1520	1500

Constant Voltage Mode

Model		PSU	6-200	12.5-120	20-76	40-38	60-25
Line regulation (*3)		mV	2.6	3.25	4	6	8
Load regulation (*4)		mV	2.6	3.25	4	6	8
Ripple and noise (*5)	p-p (*6)	mV	60	60	60	60	60
	r.m.s. (*7)	mV	8	8	8	8	8
Temperature coefficient		ppm/ °C	100ppm/°C of rated output voltage, after a 30 minute warm-up.
Remote sense compensation voltage (single wire)		V	1	1	1	2	3
Rise time (*8)	Rated load	ms	80	80	80	80	80
	No load	ms	80	80	80	80	80
Fall time (*9)	Rated load	ms	10	50	50	80	80
	No load	ms	500	700	800	1000	1100
Transient response time (*10)		ms	1.5	1	1	1	1

Constant Current Mode

Model		PSU	6-200	12.5-120	20-76	40-38	60-25
Line regulation (*3)		mA	22	14	9.6	5.8	4.5
Load regulation (*11)		mA	45	29	20.2	12.6	10
Ripple and noise (*12)	r.m.s.	mA	400	240	152	95	75
Temperature coefficient		ppm/ °C	100ppm/°C of rated output current, after a 30 minute warm-up.

Protection Function

Model		PSU	6-200	12.5-120	20-76	40-38	60-25
Over voltage protection (OVP)	Setting range	V	0.6 - 6.6	1.25 - 13.75	2 - 22	4 - 44	5 - 66
	Setting accuracy	V	0.06	0.125	0.2	0.4	0.6
Over current protection (OCP)	Setting range	A	5 - 220	5 - 132	5 - 83.6	3.8 - 41.8	2.5 - 27.5
	Setting accuracy	A	4	2.4	1.52	0.76	0.5
Under voltage limit (UVL)	Setting range		0 - 6.3	0 - 13.12	0 - 21	0 - 42	0 - 63
Over temperature protection (OHP)	Operation		Turn the output off.
Incorrect sensing connection protection (SENSE)	Operation		Turn the output off.
Low AC input protection (AC-FAIL)	Operation		Turn the output off.
Shutdown (SD)	Operation		Turn the output off.
Power limit (POWER LIMIT)	Operation		Over power limit.
	Value (fixed)		Approx. 105% of rated output power

Analog Programming and Monitoring

Model	PSU	6-200 12.5-120 20-76 40-38 60-25
External voltage control output voltage		Accuracy and linearity: ±0.5% of rated output voltage.
External voltage control output current		Accuracy and linearity: ±1% of rated output current.
External resistor control output voltage		Accuracy and linearity: ±1% of rated output voltage.
External resistor control output current		Accuracy and linearity: ±1.5% of rated output current.
Output voltage monitor		Accuracy: ±1%
Output current monitor		Accuracy: ±1%
Shutdown control		Turns the output off with a LOW (0V to 0.5V) or short-circuit.
Output on/off control		Possible logic selections: Turn the output on using a LOW (0V to 0.5V) or short-circuit, turn the output off using a HIGH (4.5V to 5V) or open-circuit. Turn the output on using a HIGH (4.5V to 5V) or open-circuit, turn the output off using a LOW (0V to 0.5V) or short-circuit.
Alarm clear control		Clear alarms with a LOW (0V to 0.5V) or short-circuit.
CV/CC/ALM/PWR ON/OUT ON indicator		Photocoupler open collector output; Maximum voltage 30V, maximum sink current 8mA.
Trigger out		Maximum low level output = 0.8V; minimum high level output = 2V; Maximum source current = 8mA.
Trigger in		Maximum low level input voltage = 0.8V; minimum high level input voltage = 2.0V, Maximum sink current = 8mA.

Front Panel

Model		PSU	6-200	12.5-120	20-76	40-38	60-25
Display, 4 digits
Voltage accuracy	0.1% +	mV	12	25	40	80	120
Current accuracy	0.2% +	mA	600	360	228	114	75
Indications			GREEN LED's: CV, CC, V, A, VSR, ISR, DLY,RMT, LAN, M1, M2, M3, RUN, Output ONRED LED's: ALM, ERR
Buttons			Lock/Local(Unlock), PROT(ALM_CLR),Function(M1), Test(M2), Set(M3), Shift,Output
Knobs			Voltage, Current
USB port			Type A USB connector

Programming and Measurement (RS-232/485, USB, LAN, GPIB)

Model		PSU	6-200	12.5-120	20-76	40-38	60-25
Output voltage programming accuracy	0.05% +	mV	3	6.25	10	20	30
Output current programming accuracy	0.2% +	mA	200	120	76	38	25
Output voltage programming resolution		mV	0.2	0.4	0.7	1.3	2
Output current programming resolution		mA	6	4	2.5	1.2	0.8
Output voltage measurement accuracy	0.1% +	mV	6	12.5	20	40	60
Output current measurement accuracy	0.2% +	mA	400	240	152	76	50
Output voltage measurement resolution		mV	0.2	0.4	0.7	1.3	2
Output current measurement resolution		mA	6	4	2.5	1.2	0.8

Input Characteristics

Model		PSU	6-200	12.5-120	20-76	40-38	60-25
Nominal input rating			100Vac to 240Vac, 50Hz to 60Hz, single phase
Input voltage range			85Vac ~ 265Vac
Input frequency range			47Hz ~ 63Hz
Maximum input current	100Vac	A	21
	200Vac	A	11
Inrush current			Less than 50A.
Maximum input power		VA	2000
Power factor	100Vac		0.99
	200Vac		0.98
Efficiency (*13)	100Vac	%	77	82	83	84	84
	200Vac	%	79	85	86	87	87
Hold-up time			20ms or greater

Interface Capabilities

Model	PSU	6-200	12.5-120	20-76	40-38	60-25
USB		TypeA: Host, TypeB: Slave, Speed: 1.1/2.0, USB Class: CDC(Communications Device Class)
LAN		MAC Address, DNS IP Address, User Password, Gateway IP Address, Instrument IP Address, Subnet Mask
GPIB		SCPI - 1993, IEEE 488.2 compliant interface
RS-232/RS-485		Complies with EIA232D / EIA485 Specifications

Environment Conditions

Model	PSU	6-200	12.5-120	20-76	40-38	60-25
Operating temperature		0°C to 50°C
Storage temperature		-25°C to 70°C
Operating humidity		20% to 85% RH; No condensation
Storage humidity		90% RH or less; No condensation
Altitude		Maximum 2000m

Environment Conditions

Model		PSU	6-200	12.5-120	20-76	40-38	60-25
Weight	main unit only	kg	Less than 8.7kg
Dimensions	(W×H×D)	mm^3	423×43.6×447.2
Cooling			Forced air cooling by internal fan.
EMC			Complies with the European EMC directive 2004/108/EC for Class A test and measurement products.
Safety			Complies with the European Low Voltage Directive 2006/95/EC and carries the CE-marking.
Withstand voltage			AC to Chassis: 1500Vac/1minAC to Output terminal: 3000Vac/1minOutput terminal to Chassis: 1000Vdc/1min
Insulation resistance			Chassis and output terminal; chassis and AC input; AC input and output terminal: 100MΩ or more (DC 500V)

Notes:

(\*1) Minimum voltage is guaranteed to maximum 0.2% of the rated output voltage. (\*2) Minimum current is guaranteed to maximum 0.4% of the rated output current. (\*3) At 85 \~ 132Vac or 170 \~ 265Vac, constant load. (\*4) From No-load to Full-load, constant input voltage. Measured at the sensing point in Remote Sense. (\*5) Measure with JEITA RC-9131B (1:1) probe (\*6) Measurement frequency bandwidth is 10Hz to 20MHz. (\*7) Measurement frequency bandwidth is 5Hz to 1MHz. (\*8) From 10% to 90% of rated output voltage, with rated resistive load. (\*9) From 90% to 10% of rated output voltage, with rated resistive load. (\*10) Time for output voltage to recover within 0.5% of its rated output for a load change from 10 to 90% of its rated output current. Voltage set point from 10% to 100% of rated output. (\*11) For load voltage change, equal to the unit voltage rating, constant input voltage. (\*12) For 6V model the ripple is measured at 2 \~ 6V output voltage and full output current. For other models, the ripple is measured at 10 \~ 100% output voltage and full output current. (\*13) At rated output power.

PSU Dimensions

PSU 6-200, PSU 12.5-120, PSU 20-76, PSU 40-38, PSU 60-25  

Declaration of Conformity

We

GOOD WILL INSTRUMENT CO., LTD.

No. 7-1, Jhongsing Rd, Tucheng Dist., New Taipei City 236, Taiwan

GOOD WILL INSTRUMENT (SUZHOU) CO., LTD.

No. 69 Lushan Road, Suzhou New District Jiangsu, China. declare that the below mentioned product

Type of Product: Programmable DC Power Supply

Model Number: PSU 6-200, PSU 12.5-120, PSU 20-76, PSU 40-38, PSU 60-25 are herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility (2004/108/EC) and Low Voltage Directive (2006/95/EC). For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Directive, the following standards were applied:

◎ EMC
EN 61326-1:EN 61326-2-1:	Electrical equipment for measurement, control and laboratory use -- EMC requirements (2013)
Conducted & Radiated EmissionEN 55011: 2009+A1:2010		Electrostatic DischargeEN 61000-4-2: 2009
Current HarmonicsEN 61000-3-2:2006+A1: 2009+A2: 2009		Radiated ImmunityEN 61000-4-3:2006+A1:2008+A2:2010
Voltage FluctuationsEN 61000-3-3: 2008		Electrical Fast TransientsEN 61000-4-4: 2012
--------		Surge ImmunityEN 61000-4-5: 2006
--------		Conducted SusceptibilityEN 61000-4-6: 2009
--------		Power Frequency Magnetic FieldEN 61000-4-8: 2010
--------		Voltage Dip/ InterruptionEN 61000-4-11: 2004

Low Voltage Equipment Directive 2006/95/EC
Safety Requirements	EN 61010-1: 2010EN 61010-2-030: 2010

INDEX

Accessories 12 Alarm description 27 Analog connector pin assignment.... 115 Analog control output control .... 128 overview 113 remote monitoring 133 resistance control - current output.... 125 resistance control - voltage output.... 123 shutdown control 131 status monitoring ...... 136, 139 voltage control - current output121 voltage control - voltage output118 ASCII table character set ...... 186 Bleeder control description 25 Build date view .... 48 Caution symbol 5 CC and CV mode description 23 CC mode operation .... 57 Cleaning the instrument ..... 7 Configuration LAN settings 103 Normal function settings ...... 99 normal function settings operation .... 109 overview 94 power on configuration operation111 power on configuration settings.107 script test settings 86 special function settings. ..... 109 System settings 106 table 94 test function settings 87 UART settings 105 USB/GPIB settings 102 Conventions 45 CV mode operation .... 54 Declaration of conformity ..... 194 Default settings .... 183 reset .... 47 Display diagram 17 Display format 186 Disposal instructions ...... 7 EN61010 measurement category .... 6 pollution degree .... 7 Environment safety instruction .... 7 Error messages 185 Ethernet interface .... 172 sockets .... 175 web server .... 172 FAQ 181 Front panel diagram ...... 14 Ground symbol 5 Grounding.... 32 How to use the instrument ..... 45 Internal resistance description .... 26 Isolated analog control option current control - current output151 current control - voltage output148 current monitoring 153 overview 140 pinout 142 specifications 141 voltage control - current output146 voltage control - voltage output143 voltage monitoring.... 153 Line voltage connection ...... 36 List of features 11 Marketing contact 182 Messages 185 Model differences ...... 10 OCP level 51 Operating area description ..... 22 Operation considerations ...... 29 floating output 32 inrush current 29 pulsed loads 29 reverse current 30 Optional accessories ...... 12 Output terminal 41 cover 43 grounding 41 load cables 42 OVP level 51 Package contents 12 Panel lock 60 Parallel calibration 77 Parallel mode connection 72 operation 75 overview 69 Parallel operation 68 Power on/off safety instruction 6 Power sequence 38 Rack mount description 44 Rear panel diagram 19 Recall setup 61 Remote control 156 Ethernet configuration ...... 172 Ethernet function check...... 173 GPIB configuration 159 GPIB function check 160 interface configuration ...... 157 local bus configuration ...... 168 multi-unit configuration ...... 168 mult-unit function check ...... 170 sockets configuration ...... 175 sockets function check ...... 176 UART configuration 164 UART function check...... 167 USB configuration 157 USB function check 158 Remote sense operation 64 Remote sense connector ...... 62 Remote sense cover 63 Save setup 60 Series mode Operation 83 overview 79 Series operation 68 Service operation about disassembly 6 contact 182 Slew rate description 25 Socket server function check .. 176 Specifications 187 System version view 48 Test script Export 90 Load 88 overview 86 remove/delete test 91 Run 89 UK power cord 8 UVL level 51 Voltage sense operation 64 Warning symbol 5 Web server function check ..... 173 Wire gauge chart 39