6. Reconnect each detector head one at a time ensuring the green LED is on.
If the green LED is not on replace the detector. Reconnecting a failed detector may cause the
Junction Box fuse to blow.
7. Continue reconnecting the detectors until all are reconnected and powered.
8. De-isolate all detectors on the engine.
If the detectors are now communicating with the Control Panel no further action is required.
9. Check that the C+ out and C- out wires of the last detector are connected to the EOL terminals in
the Junction Box. EOL + (brown) EOL (pink).
Figure 140 Communications End of Line Termination
10. Follow the steps outlined in section 5.2.2.1 to check for a wiring fault.
If all wiring is correct, replace the Interface Board in the Control Panel.
Note: In some situations, a temporary fix may be possible by moving the communications connections
to a spare output on the Interface Board.
5.2.2.5 All Detectors in fault
In the event of a loss of communications with all Detectors it is not possible to identify the failure without
specialized equipment. The failure may be located on either the Control Panel Interface Board or the
Main Processor Board.
If spare boards are available, it is possible to isolate the fault by replacing each board.
1. Replace the Control Panel Interface Board, see section 6.1.10.
If this does not eliminate the fault replace the Main Control Processor Board, see section 6.1.1.
5.2.2.6 Undiagnosed communications fault
In the event that communications faults persist after following the steps detailed in sections 5.2.2.1 to
5.2.2.5 a service visit will be required.
To Next Page
Loading...
