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MAN0443.P65 Issue 13 Aug 04 5701 Control System

05701-M-5001 A02279

CHAPTER 4 - INSTALLATION INSTRUCTIONS

13.3 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.

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