Wenglor SB4-I, Руководство по эксплуатации

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11 Safety Light Array
Over-Travel Time T
Due to the fact that interrupting the safety field during hazardous motion does not result in immediate stopping of
the machine, over-travel time T must be taken into consideration. The distance between the safety field and the
point of danger must thus be large enough to assure that the point of danger cannot be reached until hazardous
motion has come to a standstill.
Total over-travel time T is the sum of maximum response time of the contactless safety device (t1) and maximum
over-travel time of the hazardous motion (t2). Machine over-travel time must be determined by means of repeated
measurement prior to initial start-up, and each time the machine is retooled (set up).
The response time of the ESPE depends upon the height of the safety field (see table).
Type Designation
(for Transmitter and Receiver)
Beam
Clearance
Number of
Beams
Number of
Individual Beams
Response TIme
SB4-50Ix050C1 500 mm 2 18 Beams 5,7 ms
SB4-40Ix080C1 400 mm 3 27 Beams 8,2 ms
SB4-30Ix090C1 300 mm 4 36 Beams 10,0 ms
Approach / Reach-In Speed Constant K
Amongst other factors, safety clearance depends upon the maximum reach-in or walking speed of the person
penetrating the safety field.
Safety Margin C
Safety margin C depends upon the respective resolution of the light curtain.
Perpendicular Approach to the Safety Field
The following applies for an ESPE with a resolution or beam clearance of greater than 40 mm:
K = 1600 mm/s
C = 850 mm (standard arm range)
S = (1600 mm/s × T) + 850 mm
Beam Clearance
Height Above
Reference Level
Safety Clearance
Direction of Safety
Field Penetration