Principle Of Operation - schmersal SLC 412 Instructions De Montage Et De Raccordement

PRINCIPLE OF OPERATION

If the protected area is clear, the two outputs on the Receiver are active and enable the
machine to which they are connected to operate normally.
Each time that an object bigger than or equal in size to the resolution of the system
intercepts the optical path of one or more beams, the Receiver deactivates the outputs.
This condition enables hazardous machine movements to be stopped (by means of an
adequate machine emergency stop circuit).
The resolution is the minimum dimensions that an object must have so that, on
crossing the protected area, it will certainly intercept at least one of the optical
beams generated by the light curtain / light grid (Figure 1).
The resolution is constant irrespectively of work conditions, as it only depends on the
geometric characteristics of the lenses and the distance between the centres of two adjacent
lenses.
The height of the protected area is the height that is actually protected by the safety light
curtain / light grid. If the latter is placed horizontally, this value refers to the depth of the
protected area.
The working range is the maximum operative distance that can exist between the Emitter
and the Receiver.
SLC 412 is available with the following resolutions:
–
SLG 412 is available also in the Multibeam configuration with the following lens pitch:
–
40 mm (protected height 610, 910 and 1210 mm)
PROTECTION OF HANDS
500mm (2 beams), 400mm (3 beams), 300mm (4 beams).
PROTECTION OF BODY
P = Pitch between two lenses
D = Diameter of one lens
R = Resolution = P+D
Figure 1
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