Ampac SP Series, Installation, Commissioning & Operation

Page: 59 / 112

FireFinder
™
Installation Commissioning & Operation
Page 53
Fault Monitoring
The sources of fault in the system are:
9
Pressure switch monitoring circuit
9
Low pressure switch monitoring circuit
9
Lock-off valve monitoring circuit
9
Selected activation circuit
9
Stage 1 outputs
9
Stage 2 outputs
9
Fault in the trigger zones
9
Fault on the interlock input
9
Fault with a LCS
9
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 will report the type of fault on the LCD and the fault buzzer will sound for all faults.
Isolation
If the trigger zones are isolated by the FACP, then the trigger zone isolated indicator at the ACC and LCSs
is illuminated, the system inoperative output is operated and the brigade isolate relay is operated.
If interfacing the agent release add-on to an addressable FACP, and isolating devices instead of zones:
1.
The zone is not isolated, until all devices within the zone have been isolate.
2.
The trigger zone isolated and system inoperative output are only activated when the entire zone is
isolated
3.
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. Note the
variations for single and dual zone activation
System Inoperative Output
The system inoperative output is switched to +24VDC under the following conditions:
1.
Operation of the service switch
2.
Fault in the selected activation circuit
3.
Operation of the lock-off valve
4.
Operation of the inhibit at a LCS
5.
Fault in any of the trigger zones
6.
If any of the trigger zones are isolated
7.
Fault on the interlock.
Manual Mechanical Release of the Agent
With agent release systems, a manual mechanical means can be provided to release the agent.
If the pressure switch is activated (indicating that the agent has been released), and the agent release add-
on has not activated the selected activation circuit, then the following will occur:
1.
Stage 1 output is switched to +24VDC and stage 1 relay is closed
2.
Stage 2 output is switched to +24VDC and stage 2 relay output is closed
3.
Light the agent release led on the ACC and LCSs
4.
The FACP activates its Bell, ASE, Warning System, Plant, and Alarm outputs
5.
Activate gas-fired relay output
Monitoring of the Pressure Switch
Due to the requirements of Manual Mechanical Release of the Agent, the pressure switch input conveys
two pieces of information:
1.
When the pressure switch input is active, it signals that the agent has been released. The release
can be as a result of the agent release add-on or due to a manual mechanical release.