11
UK
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Install the photoelectric safety sensor at a distance
that is greater or equal to the minimum safety
distance (S) so that the hazardous area (A) can
only be accessed after complete standstill of the
hazardous machine motion�
According to the European Standard EN 999:2008 the
following formula is to be used to calculate the minimum
safety distance (S):
S = K (t1 + t2) + C
C = 8 (d - 14)
A = hazardous area
H = protected area height
S = min� safety distance
C = additional distance
S
Minimum safety distance
mm
K
Speed of approach of the object towards the hazardous area
mm/s
t
1
Total response time of the protective equipment, from release to switching off s
t
2
Total response time of the machine, from the stop signal to switching off or to
passing into the state defined as safe
s
C
Additional distance
mm
d
Resolution (detection capability)
mm
Non-compliance with the minimum safety distance may lead to restrictions
to or loss of the safety function�
Application example:
A = hazardous area
S = min� safety distance
