Sensor Connections; 12.1 General; 12.2 Catalytic Sensor Connections - Honeywell 5704 Operating Instructions Manual

MAN0448_Issue 13_01-2010
005704-M-5001 A03249
CHAPTER 4 - INSTAllATION INSTRUCTIONS
12.

SENSOR CONNECTIONS

12.1 General

Incorrect connection of the sensor wires may cause damage to
both the sensor and System 57.
The sensors connections must always be made with the System
57 unit in an unpowered state. Isolate power supplies at their
source before making connections.
Ensure that any external dc backup battery supply is also
disabled.
In order to ensure the correct operation of the system and to meet
European Standards for RFI and EMC, all sensor field cables
must be screened. The cable screen of each sensor should be
connected to the cabinet protective earth.
Connect the cabling to sensors in accordance with the Sensor Operating
Instructions and run the field cables back to the System 57 unit. The
sensor cables should be routed away from sources of interference such
as ac power cables, motors, machinery etc.
Use the information on the configuration sheet provided with the unit to
decide which sensor to connect to each channel. The following sections
describe the sensor connections for the Catalytic and 4 - 20mA input
Four Channel Control Cards.

12.2 Catalytic Sensor Connections

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.
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
of the appropriate channel on the Quad Relay Interface Card that is
attached to the required Four Channel Control Card.
WARNING
CAUTION
IMPORTANT
4-19
5704 Control System