COMMISSIONING
48
7.4 SEALED BACKBOX FLYING LEAD CONNECTIONS
7.5 CONNECTING AND COMMISSIONING THE DETECTOR
7.5.1 ASSEMBLING THE UNIT
Remove the temporary cover from the back box. Check that the wiring is correct and that all the
pins on CON1 and CON2 on the terminal PCB in the base of the back box are straight. If the relay
outputs are being used, check that links have been fitted to CON3 and CON4 to select the contacts
(see Fig. 29).
Check that the rubber seal is fitted snugly around the body of the top case assembly. Ensure that
the seal is clean and dry and before assembly. This seal is essential to provide a weather tight seal
for the enclosure. Check that four bolts are fitted to the top case retained with O-rings and that the
lanyard is firmly attached.
Bring top case up to the back-box and connect the safety chain (as a precaution) from the top
assembly to the bottom assembly as shown in Fig. 31.
Hold the top case in two hands, one on each side, and then hold the unit over the back-box.
Introduce alignment pin into barrel at top of back-box and slide top case into back box. Care should
be taken to ensure that the internal wiring is not trapped between the terminal blocks and the front
assembly. It is also important to ensure that no moisture is trapped inside the housing.
Push top case firmly into back box until it is fully in. The air inside the unit needs to escape and it
may be necessary to push the top case down in several stages to allow the air to escape. Screw up
the four socket cap retaining bolts until hand tight using an allen key. Then tighten with a torque
wrench set to a maximum force of 7lb.ft (10 Nm).
Wire Identification
Pair Colour Signal
1 Red +24V
White 0V
2 Grey Walk Test Input
White 0V
3 Green Remote Alarm LED
White 0V
4 Blue Configuration RS485+
White Configuration RS485-
5 Brown Camera Video Out+
White Camera Video Out-
6 Yellow Field Network RS485+
White Field Network RS485-
7 Orange 4 - 20mA Source/Sink
White 0V
8 Black Fault Contact
White Fault Contact Common
9 Violet Alarm Contact
White Alarm Contact Common
Drain Chassis
Table. 4 Sealed Backbox Flying Lead Connections
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