12
CALCULATION OF THE SAFETY DISTANCE
The light curtain / light grid must be positioned at a distance exceeding or equal to the
minimum
safety distance
S
so that a dangerous point can be reached only after stopping the dangerous
action of the machine.
Referring to EN 999, the minimum safety distance
S
must be calculated according to the
following formula:
S = K (t
1
+ t
2
) + C
Symbol
Meaning
Unit
S
minimum safety distance
mm
K
speed of approach of the body to the danger area
mm/sec
t
1
total response time in seconds of the safety light curtain/-grid
sec
t
2
response time of the machine in seconds, i.e. the time taken by
the machine to interrupt the dangerous action from the moment in
which the stop signal is transmitted
sec
C
additional distance
mm
Failure to comply with the safety distance reduces or defeats the protective function of the
light curtain / light grid.
If the position of the light curtain / light grid does not exclude the possibility of the
operator accessing the danger area without being detected, the system must be equipped
with additional mechanical guards.
Figure 15
Dangerous
machine
S
Summary of Contents for SLC 415
Page 2: ......
Page 34: ...32 Abbildung 33 Befestigungswinkel Abbildung 34 Befestigungsbolzen...
Page 40: ......
Page 71: ...31 Figure 33 Fastening brackets Figure 34 Fastening inserts...
Page 78: ......
Page 116: ......
