SF4C Safety light curtain
2.4 Protection Area
19
When this device is used in the 'PSDI Mode', an appropriate safety distance S must be
calculated. For details, be sure to refer to the standards or regulations applicable in each region
or country.
EXAMPLE
Calculate the safety distance with the following values:
K: 2,000
mm/s
T
m
: 0.1s
T
SF4C
: 0,7ms
d: 25mm
With these values, the calculation is as follows:
S
= K x T + C
= K x (T
m
+ T
SF4C
) + 8 x (d - 14)
= 2,000 x (0.1 + 0.007) + 8 x (25 - 14)
=
302
As 302 matches possibility 2 listed above, 302mm is the safety distance.
EXAMPLE
Calculate the safety distance with the following values:
K: 2,000mm/s
T
m
: 0.4s
T
SF4C
: 7ms
d: 25mm
With these values, the calculation is as follows:
S
= K x T + C
= K x (T
m
+ T
SF4C
) + 8 x (d - 14)
= 2,000 x (0.4 + 0.007) + 8 x (25 -
14)
= 902
As 902 matches possibility 3 listed above, recalculate the safety distance with K' =
1,600mm/s.
S
= K' x T + C
= K x (T
m
+ T
SF4C
) + 8 x (d - 14)
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