Protective field and reference contour field for access protection
•
If t
he reference contour represents the edge of the protected opening, its distance
from the protective field must not exceed 100 mm. A distance equal to the
TZ value is recommended for high availability and sufficient protection. (TZ =
tolerance zone of the safety laser scanner, see "Data sheet", page 165.)
•
If the reference contour does not represent the edge of the protected opening, the
protective field must be larger than the protected opening. The required overrun
(o) is calculated using the same formula as for hazardous point protection.
Figure 24: Tolerance band of the contour as reference field (protective field within the protected
opening, edge of the protected opening = reference contour)
1
Tolerance band of the reference contour field
2
Distance of the protective field from the reference contour, to ensure availability
4.3.5 Monitoring case switching time
When switching between monitoring cases, it is possible that a person may already be
in t
he newly activated protective field when switching takes place. Only switching in time
(namely before the danger arises for the person at this location) ensures protection.
DANGER
H
azard due to lack of effectiveness of the protective device
b
Switching of the monitoring case should be timed so that the safety laser scanner
detects a person in the protective field with a sufficient minimum distance, before
the dangerous state occurs.
4 PROJECT PLANNING
32
O P E R A T I N G I N S T R U C T I O N S | microScan3 – PROFINET 8021219/1ELL/2022-01-21 | SICK
Subject to change without notice
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