16 Fault Finding Guide Doc. version 2
3.1 Fault Conditions on devices FIRECLASS Fire Alarm Control Panels
H/W ISOLATOR AUTO This event is raised by devices with monitored internal line isolator. This
includes the 410DDM, 410TSM and ‘Q’ devices.
It is not used for standard line isolators or isolator bases.
If the internal isolator is activated, the system raises this event.
HIGH CURRENT This fault is raised by the 410DDM when operating in 4-20mA mode if the cur-
rent measured is higher than the expected range.
HI T.TERM AVG FAULT The dirtiness value of the photo detector is at 100%. This is only generated if
Condition Monitoring is enabled for the point. The detector is still working, but
should be replaced at the next regular maintenance.
The current dirtiness value can be viewed using the panel interface or printed
in a report.
GENERAL FAULT This fault is raised by the 410DDM if the current measured is below the
expected range.
LATE POLL There is a background monitor of loop point polling.
This process checks when a device is polled and how long it has been since
its last poll. If that time is outside a tight time scale, this fault is raised.
This fault will clear when polling is within expected parameters.
It is not expected that this fault will ever be announced. It is a required back-
ground process for approvals.
LOOP FAULT SHUTDOWN This fault is raised on the loop pseudo point if the loop is shut down.
LOOP O/C FAULT Raised on the loop pseudo point if it is found to be an ‘Open Circuit’ due to
open loop polling.
LOOP S/C FAULT Raised on the loop pseudo point if the loop processor detects a higher than
expected loop current.
LOW TEMPERATURE FLT Raised on PC detectors when the temperature sensor part has a failure or in
environmental conditions below -20° C. When the fault is raised, the evaluation
algorithm uses the HPO mode for alarm detection.
MULTIPLE DEVICES Used on the loop driver to indicate more than one device is replying to the
polled address.
This fault is detectedonly during the 120 second loop initialisation after a panel
restart. It is not detected on a loop restart after a loop shutdown.
The only way to clear the fault is a panel restart.
NET NO SUPERVISION This fault is raised if a networked panel fails to receive the regular supervision
poll.
NO RESPONSE This is a general fault state used by all the point drivers.
It is raised if a configured device does not respond to a poll.
The device could be on the loop, an RBus unit, or a panel not responding to
network supervision.
OPTICAL ELEMENT FLT Raised on PC detectors when the optical sensor part has a failure. When the
fault is raised, the evaluation algorithm uses the compensated CO mode for
alarm detection.
OVERLAPPING DEVICES This fault is raised if a second physical device is located on the loop at an
address covered by the multi-IO device.
PERFORMANCE FAULT This fault is used by the 410DDM when monitoring a 4-20mA device.
The processing bands are configured within Express.
Logged Message Use
Table 9: Standard Point Fault States (cont.)
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