Scanning range
The scanning range limits the maximum protective field width. The protective field width
can change during operation based on the corresponding setting.
The scanning range is reduced by using deflector mirrors.
The scanning range is reduced by using a weld spark guard.
There are 2 ways to adjust the scanning range:
•
Automatic calibration of the protective field width
When switched on, the safety light curtain automatically calibrates to the protec‐
tive field width. The position of the safety light curtain may not change later.
•
Dynamic protective field width
A range is set for a dynamic protective field width. Within this range, the protective
field width may change during operation.
Complementary information
Depending on the scanning range setting, a minimum distance to reflective surfaces
must be maintained.
Further topics
•
"Minimum distance to reflective surfaces", page 31
•
•
•
4.3.2
Minimum distance from the hazardous point
Overview
A minimum distance 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
The 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
Complementary information
More 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.
4
PROJECT PLANNING
28
O P E R A T I N G I N S T R U C T I O N S | deTec4
8021645/1EB0/2022-04-28 | SICK
Subject to change without notice
