DANGER
Hazard due to lack of effectiveness of the protective device
If there is a retroreflector in the protective field level (distance of the retroreflector from
protective field ≤ 6 m), it may not be possible detect people and parts of the body that
are to be protected, or it may not be possible to detect them on time.
b
Avoid retroreflectors in the protective field level if possible.
b
With retroreflectors at the protective field level: Increase overrun of the protective
field over the opening to be protected by supplement Z
R
= 350 mm.
DANGER
Hazard due to lack of effectiveness of the protective device
Devices with max. protective field range of 9 m: Strongly reflective surfaces (e.g. shiny
metal, tile) with a distance from the protective field ≤ 6 m can behave similarly to a
retroreflector if the laser beam hits the surface vertically. If the protective field is larger
than 50% of the effective protective field range in the direction of the laser beam which
is hitting the surface vertically, it is possible that persons and parts of the body that are
to be protected will not be detected or not be detected on time.
b
Avoid strongly reflective surfaces in the protective field level if possible.
b
With strongly reflective surfaces in the protective field level: Increase overrun of
the protective field over the opening to be protected by supplement Z
R
= 350 mm.
4.3.7.1
Overview
The protective field must be designed so that it detects a person at a minimum
distance from the hazardous point. This distance is required to prevent a person or
part of their body from reaching the hazardous area before the end of the machine’s
dangerous state.
In access protection, the minimum distance typically defines the position at which the
safety laser scanner is mounted.
The protective field must cover a minimum area so that the safety laser scanner
reliably detects a moving person:
•
The lower edge of the protective field must not be more than 300 mm above the
floor/ground according to ISO 13855.
•
Resolution < 150 mm: The top edge of the protective field must be at least
900 mm above the floor/ground according to ISO 13855.
•
Resolution 150 mm: The top edge of the protective field must be at least
1,100 mm above the floor/ground.
•
Resolution 200 mm: The top edge of the protective field must be at least
1,400 mm above the floor/ground.
•
Devices with a max. protective field range of 9 m: The top edge of the protective
field must be at least 1,400 mm above the floor/ground.
PROJECT PLANNING
4
8017784/1ELL/2022-01-21 | SICK
O P E R A T I N G I N S T R U C T I O N S | microScan3 Core I/O AIDA
39
Subject to change without notice