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, including signal propagation times in
the network and processing time in the control)
•
Response time of the protective device,
see "Response times", page 186
•
Reach or approach speed of the person
•
Resolution (detection capability) of the safety laser scanner
•
Type of approach: orthogonal
•
Parameters specified based on the application
•
Supplement to prevent reaching through
Important information
NOTE
Additional information is available in the ISO 13855 standard and in the Guide for Safe
Machinery.
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 an orthogonal
approach to the protective field. A different calculation may be required depending on
the application and the ambient conditions (for example, for a protective field parallel to
or at any angle to the direction of approach or an indirect approach).
b
Calculate S using the following formula:
S = 1600 mm/s × T + 850 mm
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)
The approach speed is already included in the formula.
4.3.9
Mobile hazardous area protection
The safety laser scanner is mounted with a horizontal scan plane in a mobile applica‐
tion, for
example on an automated guided vehicle. In mobile hazardous area protection,
the safety laser scanner protects the hazardous area created by the vehicle’s move‐
ment. The safety laser scanner detects a person’s legs. The protective field is parallel to
the direction of approach.
PROJECT PLANNING
4
8025424/1ELL/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 Pro I/O
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Subject to change without notice
