Protection Against Interference From Systems In Close Proximity To Each Other; Integration In Electrical Control - SICK deTec4 Core Operating Instructions Manual

4
PROJECT PLANNING
4.3.4

Protection against interference from systems in close proximity to each other

4.4

Integration in electrical control

22 O P E R A T I N G I N S T R U C T I O N S | deTec4 Core
Distance between sender and
receiver D in m
D ≤ 3 m
D > 3 m
Table 1: Formula for calculating the minimum distance for reflective surfaces
DANGER
Hazard due to lack of effectiveness of the protective device
Systems of safety light curtains that operate in close proximity to each other can inter‐
fere with each other.
Use appropriate measures to prevent systems in close proximity from interfering
b
with each other.
1
2
Figure 11: Preventing mutual interference from system
The infrared light beams of the sender of system 1 can interfere with the receiver of
system 2. This can disrupt the protective function of system 2. This would mean that
the operator is at risk.
Avoid such installation situations or take appropriate action, e.g., install optically opa‐
que partitions or reverse the direction of transmission of a system.
Reversed direction of transmission
1
2
Figure 12: Trouble-free operation due to reversed direction of transmission of system
tem
2
This chapter contains important information about integration in the electrical control.
Information about the individual steps for electrical installation of the device:
trical installation", page 36.
Requirements for use
The output signals of the protective device must be evaluated by downstream control‐
lers such that the dangerous state of the machine can be reliably brought to an end.
Depending on the safety concept, the signals are evaluated either with a safety relay or
a safety controller, for example.
Calculating the minimum distance for reflective surfa‐
ces a in mm
a = 131 mm
a = tan (2.5°) × 1,000 mm/m × D = 43.66 × 1 mm/m ×
D
1 and system 2
1 and sys‐
see "Elec‐
8014253/YST2/2016-04-11 | SICK
Subject to change without notice