Pilz PSEN op4F-A-14-180/1 - Manual (Page 11)

OPERATING MANUAL PSEN op4F/H-A series
1003067-EN-02 11
Application examples
This example is based on a light curtain with a height = 600 mm.
To calculate the distance of the device from the light curtain in a vertical position, the
following formula is applied:
S = K*T + C
Therefore:
T = t
1
+ t
2
t
1
= Response time of light curtain + release time of relay (specific time of PNOZ S3: 20ms)
With a reaction time of the light curtain of 15 ms the result is a max. of 35 ms for t
1
t
2
= Machine’s overall stopping performance in seconds
C = 8 * (d – 14) for devices with resolution <= 40 mm
D = Resolution
In each case, if K = 2000 mm/sec, then S > 500 mm. The safety distance will then need to be
recalculated, based on K = 1600 mm/sec.
WARNING: In this case the reference standard is EN ISO 13855
“Safety of machinery – Positioning of protective equipment in
respect of approach speeds of parts of the human body”.
The information provided here should be regarded as a summary
and is non-binding. Please refer to the complete standard ISO
13855 for details of how to calculate safety distances correctly.