NOTE
SICK offers a stopping/run-down time measurement service in many countries.
Calculation example of the minimum distance S according to ISO 13855
The example shows the calculation of the minimum distance for parallel approach
to the protective field. Depending on the application and the ambient conditions a
different calculation may be required. (e.g., a protective field or at an arbitrary angle to
the direction of approach or an indirect approach)
b
Calculate S using the following formula:
S = 1,600 mm/s × T + TZ + Z
R
+ C
RO
where:
°
S = minimum distance in millimeters (mm)
°
T = stopping/run-down time for the entire system in seconds (s)
(Response time of the safety laser s machine stopping time, incl.
response time of the machine control system and signal propagation time)
°
TZ = tolerance zone of the safety laser scanner,
°
Z
R
= supplement for reflection-based measurement errors in millimeters
(mm)
°
C
RO
= supplement to protect against reaching over, in millimeters (mm)
The reach/approach speed is already included in the formula.
Supplement Z
R
for reflection-based measurement errors
All devices: If there is a retroreflector in the vicinity of the protective device (distance
of the retroreflector from protective field ≤ 6 m), you must take the supplement Z
R
=
350 mm into account.
Supplement C
RO
to protect against reaching over
Under certain circumstances, a person can reach the hazardous area by reaching over,
before the protective device stops the dangerous state. Supplement C
RO
prevents this.
D
H
≈
0 mm
C
RO
=
1200 mm
Figure 21: Protection against reaching over when mounted low (dimensions in mm)
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