
23
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
9 Maintenance
10 Commissioning
Since the WSU/WEU is a
protective system, it is
recommended that the system be
commissioned into operation by an
expert. Experts are deemed to be
only persons trained in the handling
of such safety equipment who are
‡
employees of SICK,
‡
employees of SICK subsidiaries
and representatives abroad,
11 Malfunctions
11.1 Diagnostic Elements
The LEDs on the WSU and WEU
indicate the following operating
states (
Fig. 26
):
Fig. 26: LEDs of the WSU and WEU
Tab. 4: Functioning of the LEDs
9 Maintenance
‡
employees of companies who
operate large quantities of SICK
safety equipment at their
premises, provided they have
been trained by SICK and have
been assigned by their
employers to perform such
duties.
The front screens of the WSU and
WEU should be cleaned at regular
intervals, according to the site
conditions. The screens must only
be cleaned with a clean, soft cloth
or with cotton wool.
Use plastic cleaner as the cleaning
agent.
yellow
WSU
green
yellow
red
WEU
Continuously lit yellow
Operating voltage applied (test contact closed)
Off
yellow
No operating voltage applied or test active (For duration of test)
Continuously lit green
Light beam of sender unit reaching receiver
yellow
Sufficient light received
red
Light beam broken, briefly during test
red
Interference of another emitter element
Flashing
yellow
Insufficient light received, unit still functioning
Off
green
No operating voltage applied, light beam broken, test performed
yellow
Light beam broken, testing performed, no operating voltage applied
red
No operating voltage applied, light received from sender