SICK deTec4 C4P-EA 3SC05 Series - Page 24

Approach
T
he example shows the calculation of the minimum distance in accordance with ISO
13855 for an orthogonal (right-angled) approach to the protective field. A different
calculation may be required depending on the application and the ambient conditions
(e.g., for a protective field parallel to or at any angle to the direction of approach or an
indirect approach).
1. First, calculate S using the following formula:
S = (K × T) + 8 × (d – 14mm)
Where:
°
S =minimum dis
tance in millimeters (mm)
°
K = approach speed (stepping and/or gripping speed) of a person or a body
part (mm/s), e.g. 2,000mm/s
°
T = machine stopping time + response time of the protective device after
interruption in the light path in seconds (s)
°
d = resolution of the safety light curtain in millimeters (mm)
2. If the result S is ≤500mm, then use the determined value as the minimum
distance.
3. If the result S is >500mm, then recalculate S with an approach speed of 1,600
mm/s as follows:
S=1,600mm/s×T+8× (d–14mm)
4. If the new value S is >500mm, then use the newly determined value as the
minimum dis
tance.
5. If the new value S is ≤500mm, then use 500mm.
!
"
§
S
Figure 8: Minimum distance to the hazardous point for orthogonal (rectangular) approach to the
pr
otective field
1
Protective field height
2
Hazardous point
3
Depending on the application and distance, persons must be prevented from standing
be
hind the protective device.
Example calculation
Mac
hine stopping time = 290ms
Response time after interruption of the light path = 30ms
Resolution of the safety light curtain = 30mm
4 P
ROJECT PLANNING
24
O P E R A T I N G I N S T R U C T I O N S | deTec4 C4P-EAxxx3SC05 8028570/2023-07-27 | SICK
Subject to change without notice