4.3.1.1
Calculating minimum distance from the hazardous point
Important information
DANGER
Minimum distance from the hazardous point is too small
The dangerous state of the machine may not be stopped or not be stopped in a timely
manner due to a minimum distance that is too small.
b
Calculate the minimum distances for the machine in which the multiple light beam
safety device is integrated.
b
When mounting the multiple light beam safety device, observe the minimum dis‐
tance.
Approach
The example shows the calculation of the minimum distance for an orthogonal (at right
angles) approach to the multiple light beam safety device. Depending on the applica‐
tion and the ambient conditions, a different calculation may be required (e.g., at a dif‐
ferent angle to the direction of approach or an indirect approach).
1.
Calculate S using the following formula:
S = 1,600 mm/s × T + C
where:
°
S = minimum distance in millimeters (mm)
°
T = machine stopping time + response time of the protective device after
interruption in the light path in seconds (s)
°
C = supplement in accordance with ISO 13855:
•
If it is not possible to reach over the protective device: C = 850 mm
•
If it is possible to reach over the protective device, the value C
RO
must be
used for C in accordance with ISO 13855, provided that this is greater
than 850 mm: C ≥ 850 mm and C ≥ C
RO
The reach/approach speed is already included in the formula.
!
"
§
S
Figure 7: Minimum distance from the hazardous point
!
Height of the light beams above ground
"
Hazardous point
§
Depending on the application and distance, persons must be prevented from standing
behind the protective device.
PROJECT PLANNING
4
8021554/14Q7/2020-04-27 | SICK
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