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.
