Complementary information
Mor
e information is available in the ISO 13855 standard and in the Guide for Safe
Machinery.
SICK offers a stopping/run-down time measurement service in many countries.
Further topics
•
"R
esponse time", page 82
4.3.2.1 Calculating minimum distance from the hazardous point
Important information
DANGER
Minimum dis
tance 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 safety light curtain
is integrated.
b
When mounting the safety light curtain, observe the minimum distance.
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 = reach or approach speed of an object in mm/s: 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.
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 8027140/2021-11-04 | SICK
Subject to change without notice
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