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Project configuration
5
Project configuration
5.1
Maintaining the safety distance
5.1.1
General
The minimum distance from the start of the protected area by the safety laser scanner to
the hazardous machine component should be such that the operator cannot reach the
danger zone until the movement of the hazardous machine part has stopped.
In accordance with the standard
}
EN ISO 13855
this distance depends on the following factors:
}
Overall response time of the safety laser scanner
Time between the interruption of the laser beam and the OSSDs' change to the OFF
state (see
}
Machine's stopping time
Interval between the change of the OSSD to the OFF state and the stopping of the haz-
ardous machine movement (including the reaction time of the connected relay)
}
Approach speed
The speed with which the object to be detected is nearing the danger zone in mm/s
}
Direction of approach
– Orthogonal = vertical application
– Horizontal = horizontal application
}
Reflection of the ambient light
}
Preventing stepping behind/circumventing the safeguard
– Height of the scan plane
– Detection capability
– Switchover times
The general formula for calculating the minimum distance in accordance with
EN ISO 13855 is:
S= (K * T) + C
S
Minimum distance in mm, measured from the start of the protective zone to the
danger source
K
Approach speed at which the object (body) to be detected is nearing the danger zone
in mm/s
T
Overall time from the occurrence of a safety zone violation to the complete stop of the
machine
The value is separated for the calculation in t1 and t2, with T = t
Operating Manual PSEN sc L 3/5 series
1005056-EN-01
Calculating the overall response time [
The object to be detected approaches the danger zone at a right angle to the danger
zone.
The object to be detected approaches the danger zone in parallel to the danger zone.
32]).
+ t
.
1
2
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