Chapter 4 Operating Instructions
M4000 Adv., Adv. A/P, Area
26 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8010797/YT72/2016-02-19
Subject to change without notice
Muting
How to calculate the minimum distance:
+
+× 0.004
2
t
t
vL
res
d
Where …
L = Minimum distance [m]
v = Velocity of the material (e.g. of the conveyor belt) [m/s]
t
d
= Input delay of the UE403 or the sens:Control device [s]
(see the operating instructions of the UE403 or sens:Control device)
t
res
= Response time M4000 [s]
(see section 13.1 “Data sheet” on page 115)
Use optical sensors with background suppression. These detect material only up to a
specific distance. Objects that are further away than the material to be detected are not
detected.
4.2.1 Muting with two sensors (one sensor pair), crossed placement
In the example, the material moves from left to right or, alternatively, from right to left. As
soon as the muting sensors A1 and A2 are activated, the protection provided by the pro-
tective device (ESPE) is muted.
The following requirements must be met:
Condition Description
A1 & A2 Muting applies as long as this condition is met.
Fig. 17: Principle of operation
of sensors with background
suppression
Fig. 18: Muting with two sen-
sors, crossed placement
with two sensors, crossed
placement
detected
detected
3
2
1
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