13
•
Read the beam cell’s received signal values once a year in the same way as when the
equipment was installed (in order to identify any loss of performance).
11. Troubleshooting
Fault observed
Probable cause
Solution
The green “Tr ON” LED on the
transmission module is off
- Incorrect power supply
- Check the power supply
- No power to the transmitter
module
- Check the transmission
power supply
- Transmitter and receiver
modules using different
channels
- Set the transmitter and the
receiver to use the same
channel
- Poor cell alignment
- Repeat the alignment
procedure
The orange “Disq.” LED on
the receiver module is
permanently lit
- Object obscuring the beams - Clear the paths of the beams
- Incorrect power supply to the
receiver
- Investigate the power supply
The red “Alarm” LED on the
receiver does not light up
when all the beams are
broken
- The beams of the two cells
are not broken simultaneously
(for SB450, SB4100 and
SB4200 detectors only)
- Break all the beams at the
same time
- Poor cell alignment
- Repeat the alignment
procedure
False alarms
- Incorrect power supply
- Check the cabling and the
cross-sectional area of the
cables used
