4.3.1 Scanning range and protective field width
Important information
DANGER
H
azard due to lack of effectiveness of the protective device
Persons and parts of the body to be protected may not be recognized in case of
non-observance.
b
The safety light curtain can only be mounted to machines on which the protective
field width does not change when the safety light curtain is switched on.
Protective field width
T
he protective field width is the dimension of the light path between sender and
receiver. The maximum protective field width is limited by the scanning range.
The protective field width is automatically calibrated when the safety light curtain is
switched on during initialization and must not be changed during operation.
Scanning range
T
he scanning range limits the maximum protective field width. The protective field width
cannot change during operation.
The scanning range is reduced by using deflector mirrors.
The scanning range is reduced by using a weld spark guard.
Further topics
•
"Minimum dis
tance to reflective surfaces", page 26
•
"Technical data", page 79
•
"Deflector mirrors", page 92
•
"Weld spark guard", page 87
4.3.2 Minimum distance from the hazardous point
Overview
A minimum dis
tance must be maintained between the safety light curtain and the
hazardous point. This distance is required to prevent a person or part of their body from
reaching the hazardous point before the end of the machine’s dangerous state.
Calculation of the minimum distance according to ISO 13855
T
he calculation of the minimum distance is based on international or national stand‐
ards and statutory requirements applicable at the place of installation of the machine.
If the minimum distance is calculated according to ISO 13855, then it depends on the
following points:
•
Machine stopping time (time interval between triggering the sensor function and
the end of the machine’s dangerous state)
•
Response time of the protective device
•
Reach or approach speed of the person
•
Resolution (detection capability) of the safety light curtain
•
Type of approach: orthogonal (at right angles) or parallel
•
Parameters specified based on the application
For the USA (scope of OSHA and ANSI), different regulations may apply, e.g.:
a) Laws: Code of Federal Regulations, Title 29 (CFR 29), Part 1910.217
b) Standards: ANSI B11.19
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
23
Subject to change without notice
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