SICK WTB4-3Teach-in, Operating Instructions Manual

Page: 6 / 63

5 Fault diagnosis
Table indicates which measures are to be taken if the sensor stops working.
6 Table Fault diagnosis
LED indicator/fault pattern /
LED indicator/fault pattern Cause /
Cause Measures /
Measures
Green LED does not light up /
Green LED does not light up No voltage or voltage below
the limit values /
No voltage or voltage below
the limit values Check the power supply,
check all electrical connecti‐
ons (cables and plug connecti‐
ons) /
Check the power supply,
check all electrical connecti‐
ons (cables and plug connecti‐
ons)
Green LED does not light up /
Green LED does not light up Voltage interruptions /
Voltage interruptions Ensure there is a stable power
supply without interruptions /
Ensure there is a stable power
supply without interruptions
Green LED does not light up /
Green LED does not light up Sensor is faulty /
Sensor is faulty If the power supply is OK, re‐
place the sensor /
If the power supply is OK, re‐
place the sensor
Yellow LED flashes /
Yellow LED flashes Sensor is still ready for opera‐
tion, but the operating conditi‐
ons are not ideal /
Sensor is still ready for opera‐
tion, but the operating conditi‐
ons are not ideal Check the operating conditi‐
ons: Fully align the beam of
light (light spot) with the ob‐
ject. / Clean the optical surfa‐
ces . / Readjust the sensitivity
(teach-in) / Check sensing
range and adjust if necessary;
see graphic F. /
Check the operating conditi‐
ons: Fully align the beam of
light (light spot) with the ob‐
ject. / Clean the optical surfa‐
ces . / Readjust the sensitivity
(teach-in) / Check sensing
range and adjust if necessary;
see graphic F.
Yellow LED flashes (only brie‐
fly) /
Yellow LED flashes (only briefly) Teach-in mode /
Teach-in mode Check the teach-in mode /
Check the teach-in mode
Yellow LED lights up, no object
in the path of the beam /
Yellow LED lights up, no object
in the path of the beam / Distance between the sen‐
sor and the background is too
short /
/ Distance between the sen‐
sor and the background is too
short Reduce the sensing range,
see graphic F /
Reduce the sensing range,
see graphic F
Object is in the path of the be‐
am, yellow LED does not light
up /
Object is in the path of the be‐
am, yellow LED does not light
up Distance between the sensor
and the object is too long or
sensing range is set too
short /
Distance between the sensor
and the object is too long or
sensing range is set too short Increase the sensing range,
see graphic F /
Increase the sensing range,
see graphic F
FAULT DIAGNOSIS
5
5 8011166. 126R | SICK
Subject to change without notice