Chapter 4 Operating instructions
Flexi Classic
68 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8011509/YPP0/2015-10-26
Subject to change without notice
Special applications and
functions
4.6 Muting function
Muting overrides the protective effect of a safety device temporarily. This means that
material can be transported to or from a machine or system without the working process
having to be interrupted.
In the case of muting additional sensor signals are used to differentiate between humans
and material. To this purpose an evaluation unit (for example the Flexi Classic modular
safety controller) evaluates the signals from external sensors logically and, if the muting
condition is valid, mutes the protective device so that the material to be transported can
pass the protective device. As soon as anything except the material enters the hazardous
area, the working process is interrupted.
It is not possible to implement muting applications using the UE410-GU.
Pay attention to the following safety notes!
• Muting is only allowed to be activated during the period when the material to be trans-
ported (e.g. on a pallet) blocks the access to the hazardous area.
• Muting must be triggered by at least two independently wired signals (e.g. from muting
sensors) and must not depend entirely on software signals (for instance from a PLC).
• Muting must be removed immediately as soon as the material to be transported no
longer blocks the access to the dangerous movement so that the protective device is
once more effective.
• The material to be transported must be detected over its entire length, i.e. there must
be no interruption in the output signals.
• Always position the sensors so that the minimum distance to the protective device is
observed!
• Prevent the unintentional triggering of muting by a person by mounting the sensors
appropriately!
Always mount the muting lamp where it can be clearly seen!
The muting lamp must be clearly visible from all sides of the hazardous area and for the
system operator.
Note
WARNING
the muting sensors
Note
Ensure that muting cannot be u
by a person!
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