FireClass FC-P-S Service And Maintenance Manual page 35

FireClass Fire detection system FireClass Panels
Fault State and
Logged Description
Isolator Fault
ISOLATOR FAULT
Auto Test Failed
AUTO TEST FAILED
Detector Removed
DETECTOR REMOVED
Performance Fault
PERFORMANCE FAULT
Beacon Fault
BEACON FAULT
Isolation of non-LED out-
puts
ISOLATION FOR TEST
High Current
HIGH CURRENT
General Fault
GENERAL FAULT
Table 36: Fault Conditions on Devices
Service and Maintenance Doc. version 1
Use within FireClass
Version 21
This fault is raised by the
FC410DDM units, it is not
used for standard line
isolators or isolator bases.
If internal isolator is
activated, it raises this
fault.
Devices that offer a self-
test feature are tested
automatically on a regular
basis.
This fault is raised if one of
these regular tests fails, in
such circumstances the
user should replace the
device.
This fault will be used by
the FC410DDM when
configured to monitor cir-
cuits of conventional
devices with diode base.
This fault is used by the
FC410DDM when moni-
toring a 4-20 mA device.
The processing bands are
configured in Express.
This fault if the monitoring
of the beacon on an LPAV
device indicates it is in
fault.
If the user isolates non-LED
outputs, state is logged.
The panel is also placed
into Commissioning
Mode.
This fault is raised by the
FC410DDM when operat-
ing in 4-20 mA mode if the
current measured is
higher than the expected
range.
This fault is raised by the
FC410DDM if the current
measured is below the
expected range.
5.6 System Fault
Overview
Within the FireClass system there are both visible and audi-
ble indication for 'System Fault' which are required for com-
pliance with the EN54 standard. This section outlines the
functionality behind this visual indication.
The "System Fault" LED is part of the display PCB, the drive
to the LED is a latching circuit which when triggered, turns
on the LED and pulses the buzzer. The only mechanism for
clearing the LED and silencing the buzzer is by resetting the
latching circuit, using the push button on the back of the
display PCB board.
Hardware
The drive to the latching circuit is effectively a wired OR'ed
connection of all the FireClass system processors watch-
dog drives, it is arranged such that if any processor resets
"System Fault" will be indicated.
The obvious limitation is that the "System Fault" LED can-
not tell you which processor reset, just that one of the proc-
essors has reset. The panels LOG could tell if the CPU800
reset, but there is no mechanism to indicate which periph-
eral processor has reset.
Software Triggers
The panel firmware is designed so that under extreme cir-
cumstances it can generate "System Fault". This can be
broken down into two levels:
"Partial Operation" indication of "System Fault" but
panel partially functioning.
"Safe State" indication of "System Fault" panel halted.
These are described in the following sections.
Partial Operation
If the front cover DCM display test fails a fault is raised, addi-
tionally as required by EN54 the panel firmware detects
this and triggers "System Fault". The system is still function-
ing albeit with a corrupt or non existent display (i.e. the pri-
mary fire display has been lost).
Safe State
The following fault conditions will place the system into
"Safe State":
FireClass Firmware Bootrom Checksum failure.
FireClass Firmware RAM test failure.
FireClass Firmware FLASH test failure.
FireClass Configuration FLASH test failure.
FireClass Configuration RAM test failure.
5.6 System Fault
35