Chapter 8 Operating Instructions
WSU/WEU263
32 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8013338/YTA4/2016-03-24
Subject to change without notice
Fault diagnosis
Diagnostics LEDs of the receiver
Display
Green Yellow Red
Possible cause Rectification of the error
No operating
voltage, or voltage
too low
Check the supply voltage
and activate, if necessary.
(1 Hz,
power up
delay 10 %)
System error Switch the device off for
at least 3 seconds and
then back on again.
If the error continues to
occur:
Replace the device.
(1 Hz,
power up
delay 90 %)
Error in the supply
voltage or
unknown sender
detected
Switch the device off for
at least 3 seconds and
then back on again.
Check whether the power
supply complies with the
specification (see
chapter 5.1 on page 22).
Check whether the power
supply complies with the
technical specifications
(see chapter 9 on
page 33).
Check the distance from
reflective surfaces (see
chapter 4.1.2 on page 17)
and from other single-
beam photoelectric safety
switches.
Mount non-reflective field
of view guards, if
necessary.
If the error continues to
occur:
Replace the device.
WEU26-3
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