SICK UE410-SD, Operating Instructions Manual, Page: 36 / 56

11 Troubleshooting
This chapter describes how you can identify and remedy faults that interrupt the func‐
tion.
DANGER
In the event of unclear faults, cease operation! Stop the machine if you cannot clearly
identify or allocate the error and if you cannot safely rectify the malfunction.
11.1 Sensor fault diagnosis
Table 5: Sensor fault diagnosis
LED indicator / error pattern Possible causes Possible measures
Green status LED does not light up No voltage or voltage below the limit
values
b
Check voltage supply
b
Check all electrical connections (cables
and plug connections)
Green status LED does not light up Voltage interruptions
b
Establish a stable voltage supply
Green status LED does not light up Sensor is faulty
b
Check voltage supply
b
If the voltage supply is OK, replace the sen‐
sor
Yellow status LED flashing Sensor is still ready for operation,
but the operating conditions are not
ideal
b
Check the operating conditions:
w
Fully align the beam of light (light
spot) with the object
w
Clean the optical surfaces
w
Check compliance of the detection
zone and adjust mounting position if
necessary
Yellow status LED lights up, no
object in the path of the beam Distance between the sensor and
the background is too short
b
Adjust mounting position: greater distance
to the background
Object is in the path of the beam,
yellow status LED does not light up Distance between the sensor and
the reflector is too great
b
Adjust mounting position: greater or shorter
distance to the object
11.2 UE410-SD fault diagnosis
Table 6: Error displays of the Error-LED ERR
LED indicator Possible cause Troubleshooting
Flash 2 times or
Flash 3 times or
Flash 4 times Internal error
b
Check the wiring
b
Carry out a power-up
b
Replace the device
Flash 5 times Faulty voltage supply
b
Check voltage supply
Flash 6 times Self-monitoring, internal error etc.
b
Check the wiring
b
Carry out a power-up
b
Replace the device
11
TROUBLESHOOTING
36 O P E R A T I N G I N S T R U C T I O N S | UE410 Safeguard Detector Box 8021417/2018-01-17 | SICK
Subject to change without notice