Product Description; System Design - SICK LE20 Betriebsanleitung

Chapter 3
2 9 4
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Product description

If distance D ≤ 3 m, minimum distance a = 260 mm.
If distance D > 3 m, calculate the minimum distance a using the
following formula:
a [mm] = 88.2
Example:
The distance D between sender and receiver is 28 m.
Thus:
a [mm] = 88.2
The minimum distance a to reflective surfaces, in this example,
must be 2469.6 mm.
3
Product description
3.1

System design

The LE 20 safety evaluation unit can be used in combination with
C 2000, M 2000 units or 1 ... 6 single-beam photoelectric safety
switches to provide a complete safety system to protect personnel
operating machinery or systems. The functions available for the
photoelectric switch system vary according to the configuration.
The maximum configuration of the system comprises a photo-
electric switch cascade with three sender/receiver pairs or two
single-beam photoelectric switch cascades each with three sender/
receiver pairs as well as the LE 20 safety evaluation unit and four
muting sensors. Such a system can distinguish between objects,
which are allowed to enter the hazardous area, and personnel. The
photoelectric switch system stops the dangerous process as soon
as a person enters the hazardous area. If, however, a certain
object, e.g. a material pallet, enters the hazardous area, the
machine or system continues to operate without interruption.
Operating Instructions
Safety Evaluation Unit LE 20
D [m]
28 [m] = 2469.6 mm
8 008 685/Q913/2007-05-21