ABUS LS2120 Profiline infrared Light beam - Manual (Page 17)

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4. Now adjust the horizontal angle of the receiver by hand until the measuring
device shows the highest value.
5. Turn the adjusting screw to adjust the vertical angle of the receiver until the
measuring device shows the highest value.
6. Compare the voltage with the values below.
7. After achieving a good alignment quality, do not realign the transmitter or
receiver again.
Voltage level Quality of alignment
5 V – 3.4 V Optimal
3.4 V – 1.15 V Good
1.15 V – 1.0 V Sufficient
< 1.0 V Readjust
7.3 Adjusting the response time
By turning the potentiometer on the receiver, you can change the response time
(default 300 ms) of both light beans until an alarm is detected. If the actual
response time is shorter than the set response time, no alarm is triggered.
7.4 Putting into operation
1. Now close the transmitter and receiver with the front covers.
2. Carry out a walk test. Take the response time you set into consideration.
3. If required, readjust the Receiver and repeat the walk test.
8. Troubleshooting
Fault Possible reasons Remedy
Power LED on
transmitter (Tx) or
receiver (Rx) does not
light Incorrectly connected or
no power Check the voltage supply
at the connectors
Alarm LED (Rx) does not
light when the
photoelctric beam is
interrupted – No power
– Tx and Rx incorrectly
aligned
– The photoelctric beams
were not interrupted
simultaneously – Check the voltage
supply
– Clean the front cover
– Check the wiring
Photoelctric beams are
boken and the alarm
LED (Rx) lights, but no
alarm is triggered – Wrong or missing
connection of alarm
contacts
– Relay defect due to
over-voltage Check the connections of
the alarm contacts
Alarm LED (Rx) lights
permanently – Tx and Rx incorrectly
aligned
– Photoelctric beam is
interrupted
– Front cover is dirty or
covered in ice – Realign Tx and Rx
– Remove all obstacles
between Tx and Rx
– Clean the front cover