Reer EOS4 Series - Safety Distance Calculation

EOS4 SAFETY LIGHT CURTAIN
8 8540733 • 23/03/2016 • Rev.17
English
Calculation of safety distance
The light curtain must be positioned at a distance equal to or greater than the minimum
safety distance so that the dangerous point can be reached only after stopping the
dangerous movement of the machine (Figure 5).
According to the EN13855:2010 European standards, the minimum safety distance
must be calculated using the following formula :
where:
Minimum safety distance
mm
Operator approach speed to the dangerous area
mm/sec
Total response time of the light curtain, in seconds
sec
Response time of the machine in seconds, i.e. the time taken by
the machine to stop the dangerous movement from the moment
in which the stop signal is transmitted
sec
Additional distance that varies according to the application
1
mm
Resolution
mm
Table 2 – Safety distance
 Failure to comply with the safety distance reduces or impairs the protection function
of the light curtain.
 If positioning of the light curtain does not prevent the operator from accessing the
dangerous zone without being detected, additional mechanical guards must be
installed.
Figure 5 – Safety distance S
1
For further information on additional safety distance, refer to EN13855:2010.
DANGEROUS ZONE