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"
§
S
Figure 3: Minimum distance from the hazardous point
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Height of the light beams above ground
"
Hazardous point
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Depending on the application and distance, persons must be prevented from standing
behind the protective device.
Example calculation: access protection, no danger from reaching over
Machine stopping time = 290 ms
Response time after interruption of the light path = 20 ms
T = 290 ms + 20 ms = 310 ms = 0.31 s
S = 1600 mm/s × 0.31 s + 1200 mm = 1696 mm
4.3.2
Minimum distance from reflective surfaces
Overview
The light beam from the sender may be deflected by reflective surfaces and dispersive
media. This can prevent an object from being detected.
Therefore, all reflective surfaces and objects (e.g. material bins, machine table, etc.)
must be kept at a minimum distance (a) from the light beam. This minimum distance
(a) must be maintained on all sides of the light beam. This applies in horizontal, vertical
and diagonal directions as well as at the end of the device. The same area must be free
of dispersive media (e.g., dust, fog, or smoke).
The minimum distance (a) depends on the distance (D) between sender and receiver.
PROJECT PLANNING
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8024678/2020-01-24 | SICK
O P E R A T I N G I N S T R U C T I O N S | L25
15
Subject to change without notice