1139300 Shadow 8 User Manual
2-8 Installation and Checkout
D
pf
= 3.07
Now let’s put our numbers into the formula:
D
s
= 63 x (0.190 + .059 + .038) + 3.07
D
s
= (63 x .287) + 3.07
D
s
= 18.08 + 3.07
D
s
= 21.15 in.
The distance from the pinch point that the light curtain must be mounted is 21.15 in.
When using the ANSI safety distance formula, be sure to perform calculations in the
following order:
(1) Add T
s
+ T
c
+ T
r
+ T
bm
first.
(2) Multiply the result by 63.
(3) Add this result to D
pf
. This is D
s
.
If you do not follow this order, your safety distance calculation will be incorrect.
European Safety Distance Formulas
There are two European safety distance formulas: one for systems with a minimum object
resolution of 40 mm or less, the other for systems with a minimum object resolution of greater
than 40 mm. Formulas are based on standard EN999.
Formula for Systems with Object Resolution of 40 mm or Less
When the minimum object resolution of the light curtain is 40 mm or less, 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 = 2000 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 = 8(d-14 mm), but not less than zero
d = the minimum object sensitivity of the light curtain in millimeters
In other words:
S = (2000 mm/s x T) + 8(d - 14 mm)
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