SICK WLA12L, Operating Instructions Manual

Page: 36 / 212

7 Troubleshooting
The Troubleshooting table indicates measures to be taken if the sensor stops working.
Table 4: Troubleshooting
LED/fault pattern Cause Measures
Yellow LED does not light up
even though the light beam
is aligned to the reflector and
there is no object in the path of
the beam No voltage or voltage below
the limit values Check the power supply,
check all electrical connec‐
tions (cables and plug connec‐
tions)
Voltage interruptions Ensure there is a stable power
supply without interruptions
Sensor is faulty If the power supply is OK,
replace the sensor
Green LED flashes IO-Link communication -
Digital outputs not according to
graphic IO-Link communication -
Digital outputs not according to
graphic Parameter settings made
manually, which deviate from
the standard Initiate a factory reset. The
digital outputs are reset to
factory settings.
Yellow LED flashes Sensor is still ready for oper‐
ation, but the operating condi‐
tions are not ideal Check the operating condi‐
tions: Fully align the beam
of light (light spot) with the
reflector. / Clean the optical
surfaces (sensor and reflec‐
tor). / Reflector is not suitable
for the application in question
(we recommend only using
SICK reflectors) / Check sens‐
ing range and adjust if neces‐
sary. / Distance between the
sensor and the reflector is too
long
Yellow LED flashes (only briefly) Teach-in mode Check the teach-in mode
Signal interruptions when
object is detected Depolarizing property of the
object surface (e.g., tape),
reflection Reduce sensitivity or change
the position of the sensor
8 Disassembly and disposal
The sensor must be disposed of in line with applicable country-specific regulations.
When disposing of them, you should try to recycle them (especially the precious met‐
als).
OPERATING INSTRUCTIONS
36 O P E R A T I N G I N S T R U C T I O N S | WLA12L 8027709/2022-04-12 | SICK
Subject to change without notice
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