SICK C4000 Micro

Chapter 4 Operating Instructions
C4000 Micro/Basic/Basic Plus/Eco
20 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8009423/YT79/2016-03-14
Subject to change without notice
Installation and mounting
How to calculate the safety distance S according to EN ISO 13 855 and EN ISO 13 857:
The following calculation shows an example calculation of the safety distance. Depending
on the application and the ambient conditions, a different calculation may be necessary.
⋅ First, calculate S using the following formula:
S = 2000 × T + 8 × (d – 14) [mm]
Where …
T = Stopping/run-down time of the machine
+ Response time of the protective device after light path interruption [s]
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 minimum safety distance.
Example:
Stopping/run-down time of the machine = 290 ms
Response time after light path interruption = 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) = 512 mm
Fig.
8
:
Safety distance from
the hazardous point
Note
Hazar
-
dous
point
Distance to avoid
standing behind the safety curtain ′ 75 mm
Safety distance
S (D
s
)
Protective field height