Figure 10: Minimum distance to the hazardous point for orthogonal (rectangular) approach to the
pr
otective 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 = 30 mm
T = 290 ms +30 ms = 320 ms = 0.32 s
S = 2,000 mm/s × 0.32 s +8 × (30 mm –14 mm) = 768 mm
S > 500 mm, therefore:
S = 1,600 mm/s × 0.32 s +8 × (30 mm –14 mm) = 640 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
t
he 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.
PROJECT PLANNING 4
8027140/2021-11-04 | SICK O P E R A T I N G I N S T R U C T I O N S | deTec4
25
Subject to change without notice
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