407 reflective beam line-type smoke detector
Installation and Service Manual
12
32-0061-r04_2020-10
© 2019, 2020 Ambest Electronics (Ningbo) Co Ltd. All rights reserved.
All specifications and other information shown were current at the date of publication and subject to change without notice.
5. TROUBLE SHOOTING GUIDE
Table 2 provides a guide to faults with the detector or during commissioning.
Table 2 – Troubleshooting conditions
Cannot enter
Alignment Mode
Commissioning cannot commence until
the detector enters the Alignment mode.
Alignment mode is initiated when the
reed switch is activated by the magnetic
tool.
Check that the magnetic tool retains
its magnetic property and can
activate the reed switch.
Fault signal cannot
be cleared
Fault signals are generated when the
received signal from the reflector is too
low or the signal is distorted by ambient
light. When the automatic compensation
reaches its limit, the Fault LED and Fault
relay will be constantly active.
Check that the beam path is clear of
obstructions.
Check that the reflector is clean.
Check the beam alignment.
Check that the ambient light
conditions have not changed
significantly.
Alarm signal cannot
be cleared
Alarm signals are released when the
obscuration level exceeds the alarm
threshold or when the beam is obscured
for more than 20 s.
Check the beam alignment to ensure
the receiver is receiving the reflected
signal.
Alarm signal
released
intermittently
Intermittent Alarm signals may be
released when the local environment is
not stable
Check that the detector is securely
mounted on a stable surface.
Check the beam alignment.
Check for stray sources of electro-
magnetic interference.
Check that the transceiver is
shielded from direct sunlight.
6.1. Inspections
Conduct the following inspections every 6 months.
1) Inspect detectors for any condition that is likely to adversely affect their operation, such as excessive
deposition of dust or coating of paint.
2) Inspect the area around the detector to ensure there is no interference to the beam.
Every 12 months, disable the detector at the control and indicating equipment, then clean the transceiver
lens and reflector with a damp cloth.
6.2. Tests
Following cleaning of the transceiver lens and reflector, conduct the following tests every 12 months:
1) Test the release of the Alarm signal using the obscuration filter (see 4.2).
2) Test the release of the Fault signal using the obscuration filter (see 4.3)
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