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The safety distance for an access protection system may be calculated, based on
EN 999, by means of the following formula:
S = K x T + C
S
=
Safety distance in mm
K
=
Approach velocity in mm/s
T
=
Overall time of delay in seconds,
a total consisting of:
Response time of the laser scanner
Overtravel time of the machine including
the controls
C
=
Added margin on account of the possibility
of manual intrusion
Please also have regard, in this connection, to the diagrams given in this chapter.
5.5.4
Definition of the reference boundary
a
a
= SIMATIC FS660I Laser Scanner
b
=
Reference boundary of the detection zone
e
=
Height of frame with reference boundary
recommended value: e > 1200 mm
Fig. 5.5-1:
48
SF1
Access protection by passage monitoring with system check of a
reference boundary
S
G
e
b
SF1=
Detection zone 1, enabled
S
=
Safety distance
;
G =
Danger zone
here = 1600 mm/s
here = 80 ms
Based on measurement of
overtravel time
here = 850 mm
a
SF1
b
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