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7
Troubleshooting
8
Disassembly and disposal
8021944.1HW1 /2022-11-14 | SICK
Subject to change without notice
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
detail on Health/Alarm output operation.
The Troubleshooting table indicates measures to be taken if the sensor stops working.
Table 4: Troubleshooting
LED indicator/fault pattern
Yellow LED does not light up
even though the sender is
aligned to the object and the
object is within the set sensing
range
Yellow LED flashes; if Alarm /
Health is present then take
note of the corresponding out‐
put signal
Yellow LED lights up, no object
in the path of the beam
Object is in the path of the
beam, yellow LED does not
light up
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 INSTRUCTION
Cause
No voltage or voltage below
the limit values
Voltage interruptions
Sensor is faulty
Sensor is still ready for oper‐
ation, but the operating condi‐
tions are not ideal
Stray background remission
Object remission is too low
O P E R A T I N G I N S T R U C T I O N | ZTB18
table 2
for additional
Measures
Check the power supply,
check all electrical connec‐
tions (cables and plug connec‐
tions)
Ensure there is a stable power
supply without interruptions
If the power supply is OK,
replace the sensor
Check the operating condi‐
tions: Fully align the beam
of light (light spot) with the
object / Clean the optical sur‐
faces
Check the background for
highly reflective objects and
try to block from the sensors
field of view
Reduce distance between
sensor and object. Note that
the object may not have
enough remission for detec‐
tion.
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