!
"
§
S
Figure 11: Minimum distance to the hazardous point for orthogonal (rectangular) approach to the
protective field
!
Protective field height
"
Hazardous point
§
Depending on the application and distance, persons must be prevented from standing
behind the protective device.
Example calculation
Machine stopping time = 290 ms
Response time after interruption of the light path = 30 ms
Resolution of the safety light curtain = 14 mm
T = 290 ms + 30 ms = 320 ms = 0.32 s
S = 2,000
mm/s × 0.32
s + 8 × (14
mm – 14
mm) = 640 mm
S > 500 mm, therefore:
S = 1,600
mm/s × 0.32
s + 8 × (14
mm – 14
mm) = 512 mm
4.3.2.2
Taking reach over into account
In accordance with ISO 13855, it must not be possible to defeat the ESPE. If access to
the hazardous area by reaching over a protective field cannot be prevented, the height
of the protective field and minimum distance of the ESPE must be determined. This is
done by comparing the calculated values based on the possible detection of limbs or
body parts with the values resulting from reaching over the protective field. The greater
value resulting from this comparison must be used.
4
PROJECT PLANNING
30
O P E R A T I N G I N S T R U C T I O N S | deTec4
8021645/1EB0/2022-04-28 | SICK
Subject to change without notice
