Calculation of the distance L
1
for cross muting
2
L
1
L
2
L
3
A1
A2
1
3
L
4
Figure 14: Example for cross muting
1
Transported material
2
Electro-sensitive protective equipment (e.g., safety light curtain)
3
Hazardous area
In this example, the material can move in both directions. As soon as the pair of muting
sensors (A1 and A2) is activated, the protection afforded by the protective equipment
(electro-sensitive protective equipment) is bypassed.
The distance L
1
is calculated using the following formula:
L
1
≥ v × T
IN muting sensor
The following prerequisites must be met:
•
v × t > L
2
+ L
3
•
L
4
≥ 0
L
1
Minimum distance between the detection line of the ESPE and detection by
A1 and A2
L
2
Distance between the two detection lines of the A1 and A2 sensors (sensors
activated/sensors clear)
L
3
Length of the material in the conveying direction
L
4
Distance between the detection line of the ESPE and the point where the
muting sensors intersect
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.
•
In this example, the material is able to flow in both directions.
•
The point where the muting sensors intersect should be placed behind the light
beams of the ESPE in the hazardous area. If this is not possible, the point of
intersection may be placed exactly in the path of the ESPE light beams, but not in
front of it.
•
The sensor arrangement shown in the example is suitable for through-beam photo‐
electric sensors and for photoelectric retro-reflective sensors.
•
Prevent mutual interference of the sensors.
PROJECT PLANNING
4
8024589/2020-11-10 | SICK
O P E R A T I N G I N S T R U C T I O N S | Flexi Compact
25
Subject to change without notice
