22
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
8 Commissioning
8.1 Alignment of WSU
and WEU
After checking the electrical
connections, loosen the fixing
screws on the WSU/WEU and
align the devices to each other
roughly using the alignment sight.
For further alignment keep pressing
button S or jumper terminals 10
and 11 on the WSU and switch on
the devices. When this is done the
LED on the WSU (yellow LED)
lights up (
Fig. 24
).
Align the devices to each other so
that the green and yellow LEDs on
the WEU light up.
For optimum alignment, ascertain
the limits of the emitting and
receiving ranges by swiveling the
WSU and WEU horizontally and
vertically one after the other. Just
before the limit of the optical range
the yellow LED on the WEU begins
to flash (
Fig. 26
). Beyond the
optical range the red LED on the
WEU lights up.
Then secure the WSU and WEU
respectively in the middle of the
resulting ranges. The yellow LED on
the WEU must be permanently lit.
8.2 Alignment of WSU
and WEU with
Alignment Aid AR 60
For precise alignment of the WSU
and WEU the alignment aid AR 60
is available.
The alignment aid is clamped in
front of the WSU and WEU
respectively on a bracket (
Fig. 25
),
which is mounted underneath the
optic and held in place by two
screws.
The AR 60 emits a visible laser
beam which exactly marks the
optical axes of WSU and WEU if
they are correctly mounted.
8.3 Checking
Incorrect alignment may mean that
an obstacle is not detected or that
operational safety is not attained
(
Fig. 24
).
The functional safety of the
photoelectric safety switch is
checked by breaking the light beam
continually and along its entire
length, from just in front of the
WEU back to the WSU (surface
area 100 mm x 100 mm). While
this check is being performed, the
red LED on the WEU must remain
continuously lit. If it does not,
8 Commissioning
investigate the diversion of the light
beam between the WSU and the
WEU (reflection may be occurring,
see
6.2 Detecting Reflections
).
A function check of this kind must
be carried out
‡
daily prior to start of production,
‡
after any change in the WSU/
WEU configuration,
‡
after any servicing or
maintenance work on the
protective system.
Fig. 24: Alignment with the aid of the alignment sight
Fig. 25: Laser alignment aid AR 60 and WSU/WEU
Optical axis
Alignment sight
WSU/WEU 26/2
Fixing screw M4 x 10
Adapter for
WSU/WEU 26/2
Alignment aid AR 60
Sender
Receiver
optic
electronic