SF4C Safety light curtain
2.4 Protection Area
21
valve, etc.) (s)
T
c
: Maximum response time of the control circuit required for the brake (s)
T
SF4C
Response time of this device (s)
D
pf
Additional distance calculated from the minimum size of the object to be detected by
the safety light curtain (mm) with the formula:
D
pf
= 61.2mm
NOTE
Since the calculation above is performed by taking 1 inch = 25.4mm, there is a
slight difference between the representation in mm and that in inches. Refer to
the relevant standard for details.
EXAMPLE
Calculate the safety distance with the following values:
T
SF4C
7s
d: 0.985ich ≈ 20mm
With these values, the calculation is as follows:
S = K x (T
s
+ T
c
+ T
SF4C
+ T
bm
) + D
pf
= 63 x (T
a
+ 0.014) + 3.4 x (d - 0.276)inch
= 63 x (T
a
+ 0.014) + 3.4 x (0.985 - 0.276)
= 63 x T
a
63 x 0.007 + 3.4 x 0.709
= 63 x T
a
+ 0,441 + 2.4106
≈ 63 x T
a
2.85inch
In case this device is installed in a system with a maximum halt time 0.1 (s)
S = 63 x T
a
+ 2.85
= 63 x 0.1 + 2.85
= 9.15inch ≈ 232.41mm
Hence, as per the calculations Ds is 9.15inch ≈ 232.41mm.
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