Distance To Reflective Surfaces - SICK WSU26-2 Instrucciones De Servicio

Operating Instructions
WSU/WEU 26/2
8 008 631/P134/20-12-04 © SICK AG • Safety Systems • Germany • All rights reserved
Mounting
point-of-operation and the light beam (Fig.). The safety di-
stance depends on the machine stopping time and on the ap-
proach speed of the personnel.
The machine stopping time must be determined by repeated
measurements under practical conditions. 1.6 m/s is the re-
commended approach speed.
The safety distance is calculated as follows:
S = K · T + C
S Safety distance (mm)
K Approach speed 1.6 m/s
T Machine stopping time (ms) + response time of WEU
(see 9 Technical Data)
C Dependent on number of beams (1, 2, or 3), see Table
Number of beams
Height of beam(s)
above floor (mm)
C
5.2

Distance to reflective surfaces

Reflective surfaces located (placed or fixed) within the sender
and receiver range, may cause reflection and thus prevent an
obstacle from being reliably detected.
For this reason, a minimum distance "a" from reflective sur-
faces to the optical axis (linear connection between transmitter
and receiver) must be maintained (see illustration below). The
distance "a" is dependent on the distance between the sender
and receiver.
Testing for spurious reflection is described in Section 7 Test
Instructions.
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Chapter 5
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