15
MULTIPLE SYSTEMS
When more than one SLC/SLG 415 system is used, precautions must be taken to avoid optical
interference between them: Install units so that the beam emitted by the Emitter of one system
can only be received by the respective Receiver.
The figure illustrates some examples of correct positioning when two photoelectric systems are
installed. Incorrect positioning could generate interference and may result in malfunctioning.
Figure 20
DISTANCE FROM REFLECTIVE SURFACES
The presence of reflecting surfaces in proximity of the light curtain / light grid may generate
spurious reflections that prevent monitoring. With reference to Figure 21, object
A
is not detected
because surface
S
reflects the beam and closes the optical path between Emitter and Receiver.
A minimum distance
d
(distance between A and surface S) must be maintained between any
reflecting surfaces and the protected area. The minimum distance
d
must be calculated
according to the distance
l
between Emitter and Receiver, considering that the angle of projection
and reception is ± 2°.
Figure 21
Figure 22 indicates the values for the minimum distance
d
that must be maintained when the
distance between Emitter and Receiver is changed.
Systems installed alongside each
other: A
Installation of two adjacent Emitters
Systems installed in series: B
Emitter
Receiver
Direct beam
Reflected beam
Summary of Contents for SLC 415
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