UAD154A 3BHE026866R0101 process control card

UAD154A 3BHE026866R0101 process control card

Catalytic sensors require a three wire connection and the sensor documentation will indicate three connections S, 01 and NS, which are usually brown, white and blue respectively. In addition, the SensePoint combustible ppm version also has a screen connection. At the System 57 end of the field cable, the three sensor wires should each be connected to the respective matching S, 01 or NS terminal on the Field Interface or Relay Card that is attached to the required Single Channel Display Card.The sensor cable screen or steel wire armour (or braid), as appropriate, should be connected to the system (protective) earth. This can be achieved where the cable enters the cabinet by using a metal cable gland, or by other suitable means, and avoiding any screen 'tails' within the cabinet. Where the cable consists of a separate screen sheath and wire armour (or braid), the armour should be connected, at the cabinet entry, to the protective earth and the screen sheath should be connected to the GROUND terminal of the Field Interface/Relay Card or to a suitable instrument earth point.

4 - 20mA Loop Powered Sensor Connections

 Loop powered sensors require a two wire connection and the sensor documentation will indicate the positive and negative loop connections, usually brown and blue respectively. At the System 57 end of the field cable the two sensor wires should each be connected to one of either the S, 01 or NS terminals on the Field Interface or Relay Card that is attached to the required Single Channel Display Card. The two terminals used will vary depending upon whether the location of the measuring resistance is in the loop supply or return paths. Link options must also be set correctly on the 4 - 20mA Sensor Drive Module (see Section 12.3). The sensor cable screen should be connected to the system earth. This can be achieved at the Field Interface/Relay Card using the GROUND terminal or where the cable enters the cabinet using a metal cable gland, or by other suitable means.

CAUTION

 The power provided by the Single Channel Control Card is derived from the dc input to the System 57 (18V to 32V). Check that the transmitter to be connected is compatible with the actual supply voltage used. The maximum current that may be sourced from the field terminals of an individual Single Channel Control Card to power a field device is 500mA, however, the total current sourced from all the channels should not exceed the maximum backplane load current of 8A.

THE Main products

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