16
TROUBLESHOOTING
Before investigating individual units for faults, it is very important to check that the system wiring is fault free.
Earth faults on a data loop or any ancillary zone wiring may cause communication errors.
Many fault conditions are the result of simple wiring errors. Check all connections to the unit and make sure
that the correct value resistors are fi tted where necessary.
Fault fi nding
Unable to obtain fast or slow fl ashing alignment LED Voltmeter lead connected to interface
No power to interface
Receiver incorrectly wired
Receiver has constant slow fl ashing alignment LED Transmitter not aligned with receiver
Transmitter power too low
No power to transmitter
Receiver not pointing toward transmitter
Interface alarm LED illuminated Beam is in alarm condition
See notes
Interface HI or LO LED illuminated Beam out of alignment
Alarm Condition Beam partially obscured
Transmitter or receiver contaminated
Environmental conditions
Fault Condition Interface is in alignment mode
Beam out of alignment
Beam obscured
Receiver incorrectly wired
Environmental conditions
Notes
The alarm LED is illuminated by the control panel usually when the beam detector is in alarm condition.
However, some control panels illuminate this LED when a device fault is detected. In alignment mode, the
beam detector interface returns a fault signal.
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