10A31-4 - Electronic board Daytronic - Free user manual and instructions

Product Type	Signal Conditioner / Amplifier
Model	10A31-4
Brand	Daytronic
Dimensions (H x W x D)	180 mm x 120 mm x 50 mm
Weight	0.5 kg
Power Supply	100-240 V AC, 50/60 Hz
Power Consumption	10 VA max
Number of Channels	4
Input Signal Type	Voltage, Current, Thermocouple, RTD
Output Signal Type	0-10 V, 4-20 mA, RS-232
Bandwidth	DC to 10 kHz
Accuracy	±0.1% of reading
Operating Temperature	0°C to 50°C
Storage Temperature	-20°C to 70°C
Humidity Range	0% to 95% non-condensing
Protection Class	IP20
Enclosure Material	Aluminum, steel
Maintenance	Clean with dry cloth; no user-serviceable parts inside
Safety Features	Overvoltage protection, short-circuit protection
Repairability	Replaceable fuse, accessible terminals
Included Accessories	Power cord, user manual
Compliance	CE, RoHS

Frequently Asked Questions - 10A31-4 Daytronic

How do I connect input signals to the 10A31-4?

Use the terminal block on the front panel. Ensure the signal type matches the selected input mode (voltage or current). Refer to the wiring diagram in the manual.

What is the maximum input voltage the device can handle?

The maximum input voltage is ±10 V. For current inputs, the range is 0-20 mA or 4-20 mA. Do not exceed these limits to avoid damage.

Can the 10A31-4 be powered by a DC source?

No, the device requires an AC power supply of 100-240 V, 50/60 Hz. Do not connect to DC power.

How do I select the output signal type?

Use the DIP switches on the side of the device to choose between voltage output (0-10 V) or current output (4-20 mA). The manual provides the exact switch positions.

What is the purpose of the RS-232 port?

The RS-232 port allows remote monitoring and configuration via a computer. Use a standard serial cable and appropriate software to communicate with the device.

How do I calibrate the 10A31-4?

Calibration is performed using the onboard potentiometers. Apply a known input signal and adjust the zero and span trimmers until the output matches the expected value. Detailed steps are in the manual.

What maintenance is required?

Regularly inspect the device for dust and clean the enclosure with a dry cloth. Check the fuse periodically and replace it if blown. No other internal maintenance is recommended.

What is the operating temperature range?

The device can operate in temperatures from 0°C to 50°C. Avoid exposure to extreme heat or cold, as it may affect accuracy.

Can I mount the device on a DIN rail?

Yes, the 10A31-4 is designed for DIN rail mounting. Use the provided mounting clips to secure it on a standard 35 mm rail.

Where can I find the user manual?

The user manual is available for free download on notice-facile.com. You can also request a translated version by selecting your language and providing your email.

USER MANUAL 10A31-4 Daytronic

The Model 10A31-4 is for measurement of displacement, force, pressure, and other parameters obtained with a variable reluctance transducer or linear variable differential transformer (LVDT). Based on the synchronous carrier-demodulator principle, it supplies regulated, remotely sensed AC excitation for four independent transducer channels. It then demodulates, filters, and amplifies the resulting signals to produce system outputs precisely proportional to LVDT core displacement. The 10A31-4 automatically adjusts to the signal phase shift of the transducer in use, thereby insuring optimum sensitivity and linearity. Special input provisions exist for “long-stroke” LVDT's (full-scale range of ±1 inch or greater).

For each of its four analog inputs, the 10A31-4 produces two displayable outputs: one with "normal" analog filtering and one with high bandwidth characteristics (see Specifications and Table 1, below). All four channels share a common sensed excitation of 100 mA (rms), maximum. As explained in Section 2, for cables over 25 feet in length, this limits the distance from the sense point to the transducer to about 20 feet of 18-gage wire.

The 10A31-4's eight SUBCHANNELS are assigned as follows:

Table 1 Model 10A31-4 Subchannels
Subchannel No. Function

1	Input No. 1, low-bandwidth filter
2	Input No. 2, low-bandwidth filter
3	Input No. 3, low-bandwidth filter
4	Input No. 4, low-bandwidth filter
5	Input No. 1, high-bandwidth filter
6	Input No. 2, high-bandwidth filter
7	Input No. 3, high-bandwidth filter
8	Input No. 4, high-bandwidth filter

ADDITIONAL 10A31-4 SPECIFICATIONS

Transducer Types: 5- or 7-wire LVDT's capable of 3280-Hz operation and having primary impedance of 80 ohms or greater (all Daytronic LVDT transducers are suitable); 3- or 5-wire variable reluctance transducers

Sensitivity Range: Accommodates full-scale ranges from ±0.010 in. ( ±0.25 mm) to ±6.0 in. ( ±15.24 cm), when used with Daytronic or equivalent transducers; for System 10 channel “type” codes assigned to 10A31-4 data channels, see Table 2, below

Standard Input (rms, full-scale): 78, 156, or 312 mV/V

Long-Stroke Input (rms, full-scale): 525 mV/V, 1.05 V/V, or 2.10 V/V

(cont'd)

Excitation (per channel): Nominal 3.0 V-AC (rms) at 3280 Hz; 40 mA (rms), maximum

Amplifier (per channel):

Common-Mode Range: ±5 V operating; ±12 V without instrument damage

Common-Mode Rejection Ratio: DC and at 60 Hz: infinite; at 3 kHz: -60 dB

Input Impedance: Differential: 400 kΩ; Common-Mode: 100 kΩ

Offset: Initial: ±3% of full scale; vs. Temperature: ±20 ppm/°C; vs. Time: ±0.01% f.s./month

Gain Accuracy: ±0.02% of full scale typical, following calibration*

Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±20 ppm/month

Filter (per channel):

NORMAL: 3-pole modified Butterworth; 3 dB down at 6 Hz; 60 dB down at 60 Hz

Step-Response Settling Time (Full-Scale Output):

To 1% of final value: 250 msec

To 0.1% of final value: 400 msec

To 0.02% of final value: 500 msec

HIGH BANDWIDTH: 3-pole modified Butterworth; 3 dB down at 200 Hz; 60 dB down at 2750 Hz

Step-Response Settling Time (Full-Scale Output):

To 1% of final value: 5 msec

To 0.1% of final value: 8 msec

To 0.02% of final value: 13 msec

Auxiliary Outputs: Filtered outputs available on mainframe wire-wrap pins

Table 2 10A31-4 "Type" Codes

Full-Scale Channel Input (RMS) Type Code

78 mV/V 64

156 mV/V 63

312 mV/V 65**

525 mV/V 64

1.05 V/V 63

2.10 V/V 65**

2 TRANSDUCER CONNECTIONS

The Model 10A31-4's I/O CONNECTOR mates with Daytronic CONDITIONER CONNECTOR No. 60322, shown in Fig. 1.5 (in Manual Section 1.E.1). Table 3 gives standard pin assignments for the I/O Connector. With regard to 10A31-4 cabling, please note the following:

a. All four 10A31-4 input channels use a single, sensed excitation supply.
b. 5-wire LVDT cabling (Fig. 1(a)) or 3-wire variable reluctance transducer cabling (Fig. 1(c)) is to be used when the cable is under 20 feet in length. In this case, the +SENSE and -SENSE lines are tied to the corresponding EXCITATION lines at the CONDITIONER CONNECTOR.

7-wire LVDT cabling (Fig. 1(b)) or 5-wire variable reluctance transducer cabling (Fig. 1(d)) is to be used when the cable is 20 feet or longer. In this case, the +SENSE and -SENSE lines are tied to the corresponding EXCITATION lines at the transducer. NOTE: It is important that the distance "D" from each transducer to its sensing points be as short as possible (at least under 20 feet when 18-gage wire is used).

c. For each LVDT transducer connected to the 10A31-4, you should connect the "center wire" that joins both series-opposed secondary coils to the CABLE SHIELD at the transducer end, instead of bringing this line through a cable shield to the conditioner connector (as shown in Figs. 1(a) and 1(b)).
d. Note that there are special +SIGNAL and -SIGNAL connections for use with LONG-STROKE LVDT's (full-scale range of ±1 inch or greater). Thus, to allow for the larger input voltages produced by such a sensor, you would connect its +SIGNAL line to Pin 2, 4, 6, or 8 (instead of to Pin 1, 3, 5, or 7, respectively). Similarly, you would connect the -SIGNAL line to Pin B, D, F, or J (instead of to Pin A, C, E, or H, respectively).
e. When wiring a variable reluctance transducer to the 10A31-4, you must install a 10-kilohm "half-bridge completion" resistor between the -SIGNAL pin (A, C, E, or H) and each of the two SENSE lines, as shown in Figs. 1(c) and 1(d).

Table 3 Model 10A31-4 Pin Assignments

I/O Connector Conditioner Conditioner Pin Channel Line Number Number Function
1	1	+SIGNAL
A	1	-SIGNAL
2	1	+SIGNAL (LONG-STROKE)
B	1	-SIGNAL (LONG-STROKE)
3	2	+SIGNAL
C	2	-SIGNAL
4	2	+SIGNAL (LONG-STROKE)
D	2	-SIGNAL (LONG-STROKE)
5	3	+SIGNAL
E	3	-SIGNAL
6	3	+SIGNAL (LONG-STROKE)
F	3	-SIGNAL (LONG-STROKE)
7	4	+SIGNAL
H	4	-SIGNAL
8	4	+SIGNAL (LONG-STROKE)
J	4	-SIGNAL (LONG-STROKE)
9	*	+EXCITATION
K	*	-EXCITATION
10	*	+SENSE
L	*	-SENSE

* This function is common to all four channels.

Fig. 1 Model 10A31-4 Transducer Cabling

graph TD
    A["Channel 1"] --> B["+ EXCITATION"]
    B --> C["Channel 2"]
    C --> D["+ EXCITATION"]
    D --> E["Channel 3"]
    E --> F["+ EXCITATION"]
    F --> G["Channel 4"]
    G --> H["SHIELD"]
    H --> I[""Long-Stroke" LVDT Input"]

    subgraph Channel 1
        J["PRi"] --> K["SEC 1"]
        L["SEC 2"] --> M["SIGNAL COMMON"]
        N["SEC 2"] --> O["SIGNAL"]
    end

    subgraph Channel 2
        P["PRi"] --> Q["SEC 1"]
        R["SEC 2"] --> S["SIGNAL COMMON"]
        T["SEC 2"] --> U["SIGNAL"]
    end

    subgraph Channel 3
        V["PRi"] --> W["SEC 1"]
        X["SEC 2"] --> Y["SIGNAL COMMON"]
        Z["SEC 2"] --> AA["SIGNAL"]
    end

    subgraph Channel 4
        AB["PRi"] --> AC["SEC 1"]
        AD["SEC 2"] --> AE["SIGNAL COMMON"]
        AF["SEC 2"] --> AG["SIGNAL"]
    end

    subgraph Conditioner Connector (No. 60322)
        AH["SHIELD"] --> AI["L-S Inp* 1"]
        AI --> AJ["B 2"]
        AJ --> AK["L-S Inp* 3"]
        AK --> AL["C 3"]
        AL --> AM["D 4"]
        AM --> AN["E 5"]
        AN --> AO["F 6"]
        AO --> AP["H 7"]
        AP --> AQ["J 8"]
        AQ --> AR["K 9"]
        AR --> AS["L 10 +SENSE"]
        AS --> AT["-SENSE"]
    end

    subgraph Figure_1(a) 5-Wire LVDT Cabling (under 20 ft. in length)
        AU["Connector pins shown as viewed from rear (cable), side of connector"] --> AV["Ground Lug"]
        AW["*Long-Stroke" LVDT Input"] --> AX["SHIELD"]
    end

graph TD
    A["Channel 1"] --> B["+ Excitation"]
    B --> C["Channel 2"]
    C --> D["+ Excitation"]
    D --> E["Channel 3"]
    E --> F["+ Excitation"]
    F --> G["Channel 4"]

    subgraph Channel 1
        H["PRi"] --> I["SEC 1 + SIGNAL"]
        J["PRi"] --> K["SEC 2 - SIGNAL"]
    end

    subgraph Channel 2
        L["PRi"] --> M["SEC 1 + SIGNAL"]
        N["PRi"] --> O["SEC 2 - SIGNAL"]
    end

    subgraph Channel 3
        P["PRi"] --> Q["SEC 1 + SIGNAL"]
        R["PRi"] --> S["SEC 2 - SIGNAL"]
    end

    subgraph Channel 4
        T["PRi"] --> U["SEC 1 + SIGNAL"]
        V["PRi"] --> W["SEC 2 - SIGNAL"]
    end

    I --> X["Sensing Points"]
    K --> X
    M --> X
    Q --> X
    U --> X
    U --> X

    Y["SHEILD Connector pins shown as viewed from rear (cable) side of connector"] --> Z["&quot;Long-Stroke&quot; LVDT Input<br>SHIELD Connector pins shown as viewed from rear (cable) side of connector"]

    style Channel 1 fill:#f9f,stroke:#333
    style Channel 2 fill:#f9f,stroke:#333
    style Channel 3 fill:#f9f,stroke:#333
    style Channel 4 fill:#f9f,stroke:#333

    subgraph Channel 1
        X
        Y
        Z
        AA
        AB
        AC
        AD
        AE
        AF
        AG
        AH
        AI
        AJ
        AK
        AL
        AM
        AN
        AO
        AP
        AQ
        AR
        AS
        AT
        AU
        AV
        AW
        AX
        AY
        AZ
        BA
        BB
        BC
        BD
        BE
        BF
        BG
        BH
        BI
        BJ
        BK
        BL
        BM
        BN
        BO
        BP
        BPB
        BPB
        BPB
        BPB
        BPB
        BPB
    end

    subgraph Channel 2
        X
        Y
        Z
        AA
        AB
        AC
        AD
        AE
        AF
        AG
        AH
        AI
        AJ
        AK
        AL
        ALB
    end

    subgraph Channel 3
        X
        Y
        Z
        AA
        AB
        AC
        AD
        AE
        AF
        AG
        AH
        AI
        AJ
        AJB
    end

    subgraph Channel 4
        X
        Y
        Z
        AA
        AB
        AC
        AD
        AE
        AF
        AG
        AH
        AI
        AJB
    end

    note right of Channel 3: Sensing Points

10A31-4 QUAD LVDT CARD

3 SETUP AND/OR OPERATING CONSIDERATIONS

3.a CONFIGURATION AND CALIBRATION

For initial configuration of ANALOG INPUT CHANNELS dedicated to a specific Model 10A31-4 card when used in System 10, see the general remarks on System 10 "real-channel" configuration in Manual Section 1.G.1 and elsewhere in the System 10 Guidebook. For 10A31-4 channel "type" codes, see Table 2, above.

In System 10, a relatively linear Model 10A31-4 channel normally employs TWO-POINT (DEADWEIGHT) CALIBRATION.* See Manual Section 1.G.5 for a general discussion of this conventional "zero and span" calibration technique. Note, however, the following special procedure that applies to an LVDT-based Channel No. "x":

1. Make sure the channel has been properly "typed" and "located" (see Manual Section 1.G.1).
2. Turn ON the system EEPROM SWITCH and enter a command of

$$ \text { BEE } x = 0 [ \mathrm{CR} ] $$

This command sets an initial ZERO OFFSET ("b" term) of zero for Channel No. x.

1. Observing a "live" reading of the channel, mechanically adjust the fixture and physical position of the LVDT until the lowest reading occurs. This is the LVDT's "electrical null" point.

2. With the transducer still in "null" position, enter a command of

$$ Z R O \times [ C R ] $$

1. Displace the LVDT probe by a precisely known distance, preferably between 80% and 100% of the transducer's nominal full-scale rating.

2. Command

$$ F R C x = z [ C R ] $$

where “z” is the exact value of the displacement produced in Step 5, expressed in appropriate engineering units (the precision of the final measurement will match that of the entered “z” value).

1. Repeat Steps 4, 5, and 6, if necessary, until the LVDT's zero and span points coincide with the calibration block or micrometer reference being used.