4 Operation with marginal light reception
The sensor will provide a pre-failure notification by flashing the orange LED indicator when
operating with marginal light reception. This may be the result of incorrect alignment,
contaminated optical surface(s), and/or insufficient light remission from the target. The
sensor may be equipped with a Health or Alarm output, which provide a discrete signal
when the sensor is operating in the marginal condition. Refer to table 2 for additional
detail on Health/Alarm output operation.
7 Troubleshooting
The Troubleshooting table indicates measures to be taken if the sensor stops working.
Table 4: Troubleshooting
LED indicator/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
Yellow LED flashes; if Alarm /
Health is present then take
note of the corresponding out‐
put signal
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
object / Clean the optical sur‐
faces
Signal interruptions when
object is detected
Depolarizing property of the
object surface (e.g., tape),
reflection
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).
NOTE
Disposal of batteries, electric and electronic devices
•
According to international directives, batteries, accumulators and electrical or
electronic devices must not be disposed of in general waste.
•
The owner is obliged by law to return this devices at the end of their life to the
respective public collection points.
•
WEEE: This symbol on the product, its package or in this document,
indicates that a product is subject to these regulations.
9 Maintenance
SICK recommends the following regular maintenance:
OPERATING INSTRUCTION
8021946.1HW1 /2022-11-14 | SICK O P E R A T I N G I N S T R U C T I O N | ZLD18 / ZLE18
27
Subject to change without notice
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