Honeywell 5701 Operating Instructions Manual page 89

MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
CHAPTER 4 - INSTALLATION INSTRUCTIONS
Single Channel Control Card Catalytic 05701-A-0302
Fitted with Catalytic Sensor Drive 05701-A-0284
Junction Box
Terminal Block
Junction
Box
S
01
NS
Brown
White
Blue
780 Series
910 704/705
980 Sensors
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.
Combustible Sensor, Junction Box and Terminal Block Connections
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.
Green/Yellow
Earth Terminal
Relay/Field Interface Card
05701-A-0326
05701-A-0327
05701-A-0328
05701-A-0329
05701-A-0330
Separate Screen Sheath
(If Fitted)
Screened/
Armoured Cable
4 - 26
5701 Control System
Cabinet
GND
25
S
27
28
01
29
NS
Protective
Earth