Multiple Fuse Protection - SICK WSU26-2 Instrucciones De Servicio

Chapter 5
8 008 631/P134/20-12-04 © SICK AG • Safety Systems • Germany • All rights reserved
158
Mounting
Central beam
WSU
Reflective object (e.
g. material container)
Point-of-
operation
boundary
Correct mounting, correctly aligned: reflective object outside diver-
gent light beam. No reflection. The obstacle is clearly detected
a (mm)
2500
WSU
4˚
2000
1500
1000
500
400
300
200
100
3
10
Distance "a" as a function of scanning range RW I and RW II
5.3 Multiple units
When using two WSU/WEU in a single safeguarding application,
interference must be prevented. Because the light beam of the
WSU diverges, the light-beam cross section increases the grea-
ter the distance between the WSU and the WEU. Consequently,
Entry direction
Obstacle
a
a
WEU
4˚
a
6 9 12
20 30 40
Operating Instructions
WSU/WEU 26/2
Beam array bro-
ken
a (70 m)
a (18 m)
15 18 21
RW I
50 60 70
RW II
WEU
RW (m)