8
OMRON SCIENTIFIC TECHNOLOGIES INC.
Fremont CA USA
Tel: 1/888/510-4357 in USA and Canada
© OSTI 1209 PN99584-0050 Rev. E
Original Instructions
30
d = the minimum object detection of the 4700 in millimeters.
i.e.:
S = (2000 mm/s x T) + 8(d – 14 mm)
This formula applies for all minimum distances of S up to and including 500 mm. The minimum value
of S shal
l not be less than 100 mm.
If S is found to be greater than 500 mm using the formula above, then the formula below can be used.
In this c
ase the minimum value of S shall not be less than 500 mm.
S = (1600 mm/s x T) + 8(d – 14 mm)
8.2.2 SAFETY DISTANCE FORMULA FOR SYSTEMS WITH A MINIMUM OBJECT RESOLUTION GREATER THAN 40 MM
When the minimum object resolution of the system is greater than 40 mm, use the following formula:
S = (K x T) + C
where:
S = the minimum distance in millimeters, from the danger zone to the detection point, line, plane or
zone.
K = 16
00 mm/s
T = the overall system stopping performance in seconds.
T = t
1
+ t
2
t
1
= response time of the safety light curtain in seconds. This response time is given in Table 14-1,
Table 14-2 and Table 14-3.
t
2
= maximum stopping time of the machine is seconds.
C = 850 mm.
i.e.:
S = (1600 mm/s x T) + 850 mm
8.2.3 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 8.2.1 Safety
Distance Formula
for Systems with a Minimum Object Resolution of 40 mm or Less applies except that
the minimum distance S shall be greater than 150 mm. For parallel approach the formula C becomes:
C = 1200mm – (0.4 x H), but not less than 850 mm.
H = the height of the detection zone above the floor in mm.
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