MAN1544-5
44
6.9
Fault Supervison
➢
The sources of fault in the system are:
➢
Pressure switch
➢
Low pressure switch
➢
Lock-off valve
➢
Selected activation circuit
➢
Stage 1 outputs
➢
Stage 2 outputs
➢
Fault in the trigger zones
➢
Fault on the interlock input
➢
Fault with a LCS
➢
Low agent pressure
With all faults the common fault indicator at the Front Panel and LCSs is illuminated.
For a pressure switch fault, low pressure switch fault, lock-off valve fault, stage 1 output fault and stage 2
output fault, trigger zones, LCS fault(missing), interlock fault the FACP will signal the brigade accordingly.
With a fault in the activation circuit, interlock circuit or fault with the trigger zones, in addition to the
above, the system inoperative output is operated.
The FACP fault buzzer will sound for all faults.
The FACP will report the type of fault on the LCD
6.10
Isolation
If the trigger zones are isolated by the FACP, then the trigger zone isolated indicator at the ARC and LCSs is
illuminated, and the system inoperative output is operated.
In addition the brigade isolate relay is operated.
Regarding interfacing the agent release add-on to an addressable FACP, and isolating devices instead of
zones:
➢
The zone is not isolated, until all devices within the zone have been isolate.
➢
The trigger zone isolated and system inoperative output are only activated when the entire zone is
isolated
➢
If the agent release add-on has commenced to a release sequence, and the device(s) is alarm is
(are) isolated, then the release sequence is stopped, since the alarm has been removed. See
sections 5.3.1 and 5.3.2. Note the variations for single and dual zone activation
6.11
System Inoperative Ouput
The system inoperative output is switched to +24VDC under the following conditions:
➢
Operation of the service switch
➢
Fault in the selected activation circuit
➢
Operation of the lock-off valve
➢
Operation of the inhibit at a LCS
➢
Fault in any of the trigger zones
➢
If any of the trigger zones are isolated
➢
Fault on the interlock.
