SG-BWS-T4
9
3
0
0
m
m
6
0
0
m
m
9
0
0
m
m
1
2
0
0
m
m
Fig. 6 Photocells installation heights for 4 beams protections
The reference safety norm is EN 13855 "Safety of machinery -- Positioning of
safeguards with respect to the approach speeds of parts of the human body"
The following information is to be considered as indicative and concise. For
correct safety distance please refer to complete standard EN 13855.
Example: light curtain with 4 S5 photocells
S = K (t1 + t2 + t3) + C
where:
t
1
=
SG-BWS-T4 response time
29 ms
t
2
=
S5 response time
1.5 ms
t
3
=
machine total stopping time
290 ms
P
=
850 mm for devices with resolution
≥ 40 mm.
850 mm
S = 1600
∙ 0.321 + 850 = 1364 mm
