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SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 Technical Description · WSU/WEU 26-2 © SICK AG · Safety Systems · Germany · All rights reserved
Simple malfunctions can be rectified
by referring to the chart below.
Before opening up the units clean
the housing thoroughly to prevent
dirt entering the interior.
Fault
LED on WSU not lit
LED on WSU lit,
none of the three LEDs
on the WEU lit
The red LED on the WEU
is permanently lit
(no light being received)
The yellow LED on the WEU flashes
(insufficient light being received)
The yellow and red LEDs
on the WEU are permanently lit
Cause
No power supply
Break between terminals 10 and 11
(test contact)
No power supply on WEU
Break at relay contact
Relay defective
Unit out of alignment
Front screen dirty
Test input (sender) interrupted
Receiver WEU defective
Sender WSU not emitting
Sender WSU defective
Units or corner mirrors out of alignment
Front screen of WSU/WEU or corner
mirror dirty
Electronics activated:
Interference of another emitter element
Electronic card defective
Do not touch any electrical connections when the unit is open
and switched on.
Testing and remedy
Check voltage
Check passage
Check voltage on WEU
Replace unit
Re-align WSU and WEU units
Clean front screens of WSU and WEU
Check testing
Replace unit
On WSU briefly switch power off and
on again (min. 1 s)
Replace unit
Adjust units or corner mirrors to
optimum alignment
Clean front screen or corner mirror
On WEU briefly switch power off and
on again (min. 1 s)
WEU must only respond to the
corresponding WSU
Replace unit
.
