Shadow 8 User Manual 1139300
Installation and Checkout 2-9
This formula applies for all minimum distances of S up to and including 500 mm. The
minimum value of S cannot be less than 100 mm.
If S is found to be greater than 500 mm, using the formula above, then the following formula
can be used.
S = (1600 mm/s x T) + 8(d - 14 mm)
In this case, the minimum value of S cannot be less than 500 mm.
Formula for Systems with Object Resolution Greater than 40 mm
When the minimum object resolution of the light curtain is greater than 40 mm, as when you
are using blanking windows (see Increasing Safety Distance To Compensate for Blanking
Windows, page 2-10), use the following formula to calculate the safety distance:
S = (K x T) + C
where:
S = the minimum distance in millimeters from the pinch point to the sensing point,
line, plane or field
K = 1600 mm/s
T = the overall system stopping performance in seconds
T = t1 + t2
t1 = response time of the safety light curtain in seconds
t2 = maximum stopping time of the machine in seconds
C = 850 mm
In other words:
S = (1600 mm/s x T) + 850 mm
Factors Affecting the Safety Distance Formula
When light curtains are used for machine initiation, their minimum object resolution must be
30 mm or smaller (based on EN999; other standards may vary). In this case, the formula
given in Formula for Systems with Object Resolution of 40 mm or Less, above, applies except
that the minimum distance
S must be greater than 150 mm. The formula for C becomes:
C = 1200mm - (0.4 x H), but not less than 850 mm
where:
H = the height of the sensing field above the floor in mm
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