PSEN opII4H Series
Operating Manual PSEN opII4H Series
1003501-EN-02
15
t
4
Interval between enabling of the protected field and the OSSD’s change to the
ON state
}
If a synchronisation beam pair is interrupted: Response time + 10 ms
}
If both synchronisation beam pairs (first and last light beam pair) are inter-
rupted: typically 600 ms (no more than 4 s)
Project configuration
Maintaining the safety distance
The minimum distance between the safety light grid and the hazardous machine compon-
ent should be such that the operator cannot reach the hazardous area until the hazardous
machine part has come to a standstill.
In accordance with the standard
}
EN ISO 13855
this distance depends on three factors:
}
Response time of the safety light grid
Interval between interruption of the beams and the OSSD’s change to the OFF state
}
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 hazardous area in mm/s
The general formula for calculating the minimum distance in accordance with
EN ISO 13855 is as follows:
S = K * (t
1
+ t
2
) + C
S
Minimum distance in mm, measured from the start of the protected field to the
danger source
K
Approach speed with which the object to be detected is nearing the hazardous area
in mm/s
K = 1600 mm/s when S > 500 mm
K = 2000 mm/s when S ≤ 500 mm
t
1
Response time of the safety light grid in seconds
Time it takes for the signal at the OSSD output on the safety light grid to change
once a protected field has been violated
t
2
Machine's stopping time in seconds
The time required for the machine to stop after the signal at the OSSD output
changes
C
Additional distance of 128 mm for safety light grids with hand protection
Resolution
The safety light grids may only be used for protected fields in which a detection capability of
30 mm is sufficient.