Calculation of the distance L
1
for sequential muting
1
3
2
L
1
L
3
L
2
A1
B1
A2
B2
Figure 13: Example for sequential muting
1
Transported material
2
Electro-sensitive protective device (e.g., safety light curtain)
3
Hazardous area
In this example, the material moves from left to right. As soon as muting sensors A1
and A2 are activated, the protection afforded by the protective equipment (electro-sen‐
sitive protective equipment) is bypassed.
In the example, four muting sensors with identical response times are used. The two
muting sensor pairs are mounted symmetrically, i.e., at the same distance from the
detection range of the ESPE. Different configurations require separate consideration.
The distance L
1
is calculated using the following formula:
L
1
≥ v × 2 × T
IN muting sensor
The following prerequisites must be met:
•
v × t > L
1
+ L
3
•
L
2
< L
3
L
1
Distance between the inner sensors (arranged symmetrically in relation to
the detection zone of the electro-sensitive protective device)
L
2
Distance between the outer sensors (arranged symmetrically in relation to
the detection zone of the electro-sensitive protective device)
L
3
Length of the material in the conveying direction
v
Speed of the material (e.g., of the conveyor system)
t
Configured total muting time (s)
T
IN muting sensor
Response time of the slowest muting sensor used to initiate a muting sta‐
tus.
•
The material can either be moved in both directions or only one transport direction
can be allowed using the
Direction detection
configuration parameter.
•
The sensor arrangement shown in this example is suitable for all types of sensor.
•
Prevent mutual interference of the sensors.
4
PROJECT PLANNING
24
O P E R A T I N G I N S T R U C T I O N S | Flexi Compact
8024589/2020-11-10 | SICK
Subject to change without notice
