Chapter 9 Operating Instructions
M4000 Adv., Adv. A/P, Area
94 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8010797/YT72/2016-02-19
Subject to change without notice
Commissioning
9.2.3 Special aspects of alignment with deflector mirrors
If you use the M4000 multiple light beam safety device with deflector mirrors (mirror
columns), then you must note the following points when aligning the mirrors:
1. On the deflection of several beams using a mirror column, each individual mirror must
be adjusted separately.
2. For deflection using mirrors, the angle of incidence equals the angle of reflection. This
means: A slight rotation of the mirror results in a change that is twice as large
(see Fig. 61).
If the light beam is guided to the receiver using a deflector mirror, only part of the origi-
nal diverging beam is passed on.
The alignment tolerance will become smaller with each further deflection (see Fig. 62).
Always use an alignment aid when aligning the M4000 Advanced with deflector mirrors
(see section “Alignment aids” on page 90).
Recommendation
Fig. 61: Schematic
illustration of the change on
slight rotation of the deflector
mirror
Fig. 62: Schematic
illustration of the alignment
tolerance without and with
deflector mirror
rotated slightly
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