
8
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
5.3 Multiple
Safeguarding
When using two WSU/WEU units
in a protective system, the
possibility of mutual interference
must be excluded. Since the light
beam of the WSU diverges, the
cross-section of the beam increases
as the distance between the WSU
and WEU grows. The following
conditions must therefore be met
when arranging the WSU/WEU:
5.3.1 Mutual Interference
The light beam of the WSU must
only be received by the
corresponding WEU. To prevent
mutual interference between
several WSU/WEU installations
arranged adjacent to or above each
other, the specified beam diameters
must be taken into account when
mounting the devices (
Fig. 6
).
Fig. 6: Safeguarding a hazardous area with WSU/WEU
Mutual interference is possible
There are two versions
of the WSU, for
operating ranges
0.5 ... 18 m and
15 ... 70 m. The WSU
must not be used for
operating ranges below
15 m. The operating
range is given on the
rating plate.
Corner mirror
approx. 900
approx. 400
Corner mirror
Corner mirror