Edwards LaserSense 100, Руководство по установке

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Chapter 4: Troubleshooting
36 LaserSense 100 Aspirating Smoke Detector Installers Handbook
Troubleshooting the detector
This chapter provides some possible solutions if a problem should occur with
your detector. If the problem is not addressed in this chapter or, if after
performing the suggested actions, the problem persists, contact Technical
Support.
Table 5: Troubleshooting guide
Problem Solution/Corrective Action
Nuisance alarms
occur too often Check that the ClassiFire alarm factor setting is appropriate for the normal
working environment of the protected area.
Check that the detector is not in demo mode. This can be ascertained by
viewing the event log and checking that the entry demo mode has a higher
log entry number than the most recent FastLearn start and FastLearn end
entries. Note: Remember that the log entries are in reverse order, with the
most recent entries appearing first. If the log shows that demo mode was
invoked during the last FastLearn period, start a new FastLearn and allow
it to complete its 24-hour cycle.
From the event log, check that 24 hours have elapsed since the last
FastLearn end entry.
Check that day-night switchover times are appropriately set to reflect active
and nonactive periods.
Elevated smoke
levels do not
generate alarms Check that detector is not isolated or in FastLearn (if Isolated, the Fault
light will be lit; if in FastLearn, the OK light will flash).
Check that the detector sampling points are in the smoke stream.
Check that sampling pipes are firmly and cleanly seated in their ports and
undamaged.
Check that the correct ClassiFire alarm setting has been set.
Check that the detector has either had a 24-hour learning period or that it
has been placed in demo mode.
Low mean output Check that the dust separator (filter) cartridge does not require changing
(refer to “Replacing the dust separator cartridge” on page 42 for details)
and that the air plenum chamber is clean. The chamber may become
clogged when, for example, heavy building activity has occurred near the
sampling pipes. If so, the chamber may require factory service. The
detector is not designed to handle large quantities of coarse debris and
dust.
Detector sensitivity
varies over time There are many reasons why particle densities may vary, and the
ClassiFire system is designed to automatically compensate for this in order
to reduce the likelihood of nuisance alarms due to normal variations in
background smoke density. Within limits set by the ClassiFire alarm factor,
this is a normal part of the detector‘s operation.
Flow fault errors These occur when the airflow rate into the detector exceeds the
preprogrammed parameters. As the detector “learns” the flow setup from
the initial installation, this usually means that there has been some change
in conditions.
If the detector input is sampled from one area and the exhaust is in another
area with different pressure (e.g., the detector is in a roof space and
sampling from an enclosed room), this may lead to flow faults. In this case,
it would be necessary to lead a pipe from the exhaust to the protected area
to ensure nominal flow.