SR0151 - Flow sensor IFM - Free user manual and instructions

USER MANUAL SR0151 IFM

• Adhere to the operating instructions. Non-observance of the instructions, operation which is not in accordance with use as prescribed below, wrong in- stallation or incorrect handling can affect the safety of operators and machinery.

• The unit must only be installed, connected and put into operation by a qualified electrician as during the installation dangerous voltages may be exposed. The safe function of the unit and the plant is only guaranteed when installation is correctly carried out.

• Disconnect the unit externally before handling it. Also disconnect any indepen- dently supplied relay load circuits.

• Be careful when handling the unit once power is applied. This is only allowed by qualified personnel due to the protection rating IP 20.

• The design of the unit corresponds to protection class II (EN 61010) except for the terminal blocks. Protection against accidental contact (safety from finger contact to IP20) for qualified personnel is only ensured if the terminals have been completely inserted. For this reason the unit must always be installed in a control cabinet which can only be opened with a tool, for pollution degree 2 and overvoltage category II.

• For DC units the external 24 V DC supply must be generated and supplied ac- cording to the requirements for safe extra-low voltage (SELV) since this voltage is provided near the operating elements and at the terminals for the supply of sensors without further protection measures.

• In case of malfunction of the unit or queries please contact the manufacturer. Any tampering with the device can seriously affect the safety of operators and machinery. This is not permitted and leads to an exclusion of liability and war- ranty.4 3 Function and features The evaluation system VS3000 is designed to work with flow sensors of the type SFxxxx. It evaluates the signals from the sensors and signals whether there is a preset flow rate or not:

• Flow above the preset value / output relay is energised.

• Flow below the preset value / output relay is de-energised.

• Flows of either liquids or gases can be monitored.

• Wire break monitoring: in the case of an open-circuit or short-circuit the monitoring relay is de-energised, the red LED (WIRE BREAK/RELAY) signals a fault.

• Temperature monitoring: relay is energised when temperature is exceeded, the red LED (TEMP/RELAY) signals a fault. The unit is not approved for safety tasks in the field of safety of persons. 4 Mounting

• Install the unit in a control cabinet which can only be opened with a tool, for pollution degree 2 and overvoltage category II, to guarantee protection against accidental contact with dangerous contact voltages and against atmospheric influences. The control cabinet should be installed in accordance with local and national rules and regulations.

• Mount the unit on a DIN rail Once mounted leave enough space between the unit and the top and bottom of the control cabinet (to enable clear space for convection cooling). When several units are mounted side by side the internal heating of all units has to be considered. The ambient temperature for the individual unit must not exceed the permissible value of +60°C. ► In this case adhere to the distances between the units. The following applies to identical VS3000 units: distance = at least 5 mm. For units from other companies the permissible distance is to be deter- mined by measurements.

• Prevent the penetration of conductive or other dirt into the housing or wiring.5

4.1 Mounting of the sensors

Adhere to the mounting instructions of the manufacturer. 5 Electrical connection The unit must only be connected by an electrician. The national and international regulations for the installation of electrical equipment must be observed. ► Avoid contact with voltages. ► Disconnect the plant from power before wiring. ► Check if the relays are connected to voltages of external power sup- plies.

• In order to avoid malfunction caused by interference, lay the sensor cable separately from the load cable. Max. length of the sensor cable: 100m.

• Connection by means of Combicon connectors (fitted). Combicon connectors are also available as accessories: - connector with cage clamps (order no. E40171), - connector with screw terminals (order no. E40173).6

1: flow monitoring 2: wire break monitoring 3: temperature monitoring 4: power-on delay time 5: selection liquid / gas Core colours for flow sensors of the type SFxxxx: BN = brown, BU = blue, BK = black, WH = white, GY = grey

5.2 Power supply (Power)

Terminal 1: L (AC unit) / L+ (DC unit). Terminal 2: N (AC unit) / L- (DC unit).

• For DC units the supply voltage must be protected externally (max. 2A).

• The terminals of the DC supply are directly linked with the terminals of the sensor supply. This is why the SELV criteria must be adhered to for DC supply (protective low voltage, circuit galvanically separated from other circuits, not earthed).

• If the DC circuit is to be earthed (e.g. because of national regulations), the PELV criteria have to be adhered to (protective low voltage, circuit galvanically separated from other circuits).7

• If the unit is supplied with AC voltage, the low voltage supply for the sensors meets the SELV criteria.

5.3 Connection of sensors

Please also adhere to the SELV criteria for the sensor connection so that there is no dangerous contact voltage at the sensor which can enter the unit!

The voltage between the different output circuits (terminals 4, 5, 6 – terminals 7, 8, 9 – terminals 10, 11, 12) must not exceed the permissible maximum value of 300 V AC. Insert a miniature fuse according to IEC60127-2 Sheet 1 (≤ 5 A fast acting). 6 Settings

Bank of LED‘s - red LED lit: flow below the switch point - yellow LED lit: relay is energised, flow has reached the switch point - green LED lit: flow above the switch point

Red LED (WIRE BREAK/RELAY): lights in case of wire break or short circuit of the sen- sor wires

Red LED (TEMP/RELAY): lights if the set temperature is exceeded

1. Selection of the monitored medium:

Factory setting: Monitoring of liquids. For monitoring of gases: Link terminals 23 / 24.8

2. Setting of the power-on delay time t1:

Factory setting: t1 = 10 s. To define other times: Connect an external resistor (R) between the terminals 22 and 23. t1 [s] 15 20 25 30 35 40 45 50 55 60 65 70 75 80 R [kΩ] 10 18 27 39 47 56 68 82 100 120 150 180 220 270

3. Apply the operating voltage. After the power-on delay time has elapsed, the

unit is ready for operation, (during this time the output relay for flow monitoring is energised).

4. Set the preset flow and keep it constant. Turn the setting potentiometer (2) until

a green LED lights. The farther the green LED lit is away from the yellow LED, the safer is the adjustment (excess gain for flow or temperature fluctuations).

5. Set the setting potentiometer for the temperature monitoring (3) to the re-

quested limit temperature. 7 Operation After mounting, wiring and setting check whether the unit operates correctly. For units with monitoring of the sensor cable: In the case of wire break or short circuit the relay „wire monitoring“ is de-energised and the red LED lights. After rectification of the fault the control monitor is again ready for operation.

7.1 Function diagram flow monitoring