Operating Instructions Chapter 4
C4000
Installation and mounting
8 009 221/16-11-00 © SICK AG • Safety Systems • Germany • All rights reserved 23
Fig. 15: Safety distance from
the point of danger
How to calculate the safety distance S according to EN 999 and EN 294:
> First, calculate S using the following formula:
S= 2000 × T + 8 × (d – 14) [mm]
T = stopping/run-down time of the machine
+ response time of the protective device [ms]
d = resolution of the light curtain [mm]
S = safety distance [mm]
The reach/approach speed is already included in the formula.
> If the result S is £ 500 mm, then use the determined value as the safety distance.
> If the result S is > 500 mm, then recalculate S as follows:
S = 1600 × T +8×(d–14) [mm]
> If the new value S is > 500 mm, then use the newly determined value as the minimum
safety distance.
> If the new value S is £ 500 mm, then use 500 mm as the safety distance.
Example:
Stopping/run-down time of the machine = 290 ms
Response time = 30 ms
Resolution of the light curtain = 14 mm
T = 290 ms + 30 ms = 320 ms = 0.32 s
S = 2000 × 0.32 + 8 × (14 – 14) = 640 mm
S
> 500 mm, therefore:
S=1600×0.32+8×(14–14) = 512mm
Protective field height
Safety distance S
Distance to avoid standing behind
the safety curtain £ 75 mm
Point of
danger
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