Operating instructions

4 - 26

MAN0443.P65 Issue 13 Aug 04 5701 Control System

05701-M-5001 A02279

CHAPTER 4 - INSTALLATION INSTRUCTIONS

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.

Combustible Sensor, Junction Box and Terminal Block Connections

Note: Where a sensor is earthed locally, either to the Earth Stud or through the sensor casing

or mounting, to avoid earth loops the screen sheath of the cable should only be

connected at one end, i.e., at the sensor or at the Interface/Relay Card.

Single Channel Control Card Catalytic 05701-A-0302

Fitted with Catalytic Sensor Drive 05701-A-0284

Relay/Field Interface Card

05701-A-0326

05701-A-0327

05701-A-0328

05701-A-0329

05701-A-0330

N S

Brown

White

Blue

GND

Junction Box

Terminal Block

Junction

Box

Screened/

Armoured Cable

Earth Terminal

780 Series

910 704/705

980 Sensors

Cabinet

Protective

Earth

Separate Screen Sheath

(If Fitted)

Green/Yellow