6
Table Fault diagnosis
LED indicator/fault pattern /
LED indicator/fault pattern
Cause /
Cause
Green LED does not light up
No voltage or voltage below
the limit values
Measures /
Measures
Check the power supply,
check all electrical connec‐
tions (cables and plug connec‐
tions)
Green LED does not light up
Voltage interruptions
Ensure there is a stable power
supply without interruptions
Green LED does not light up
Sensor is faulty
If the power supply is OK,
replace the sensor
Yellow LED flashes
Sensor is still ready for opera‐
tion, but the operating condi‐
tions are not ideal
Check the operating condi‐
tions: Fully align the beam of
light (light spot) with the
object. / Clean the optical sur‐
faces . / Readjust the sensitiv‐
ity (potentiometer) / Check
sensing range and adjust if
necessary; see graphic F.
Yellow LED lights up, no object
in the path of the beam
Distance between the sen‐
sor and the background is too
short
Reduce the sensing range,
see graphic F
Object is in the path of the
beam, yellow LED does not
light up
Distance between the sensor
and the object is too long or
sensing range is set too
short
Increase the sensing range,
see graphic F
7
Disassembly and disposal
The sensor must be disposed of according to the applicable country-specific regula‐
tions. Efforts should be made during the disposal process to recycle the constituent
materials (particularly precious metals).
TABLE FAULT DIAGNOSIS
6
8019057.16B5 | SICK
Subject to change without notice
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Summary of Contents for GRTB18
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