!
!
!
!
!
!
!
!
"
Figure 14: Interference-free operation due to an opposite transmission direction of adjacent sys‐
tems
In the figure, the transmission direction of systems in close proximity to each other is
different. This means system
"
is not affected by the beams of system
!
.
4.3.5
Muting
Overview
Muting according to IEC 62046 temporarily bypasses the protective action of the multi‐
ple light beam safety device so that material can be transported to or from a machine
or system. As a result, the work process remains uninterrupted.
The function is configured during commissioning.
The distinction between people and materials is made by 2 signals that are indepen‐
dent of each other. Based on the logical evaluation of these signals, the protective
device is bypassed if a valid muting condition is present. As soon as something other
than material enters the hazardous area, the work process is interrupted.
Prerequisites
•
Muting may only be activated during the period in which the material to be trans‐
ported (e.g. on a pallet) is blocking access to the hazardous area
•
Muting must be automatic, i.e., not manual
•
Muting must not depend on a single electrical signal
•
Muting must be triggered by at least 2 signals wired independently of each other
(e.g. by muting sensors)
•
Muting must not depend entirely on software signals (e.g. from a PLC)
•
Muting must be reversed after the material has passed through in order that the
protective device becomes effective again
•
The material to be transported must be detected above a certain length, i.e., an
interruption of the output signals must not last longer than 500 ms
•
Attach the deTem4 LT Muting A/P system as appropriate to prevent muting from
being triggered by someone unintentionally
•
The muting sensors must not be activated when the protective device is switched
on, otherwise muting is not activated
4.3.5.1
Pre-mounted muting arms
Overview
The muting arms are pre-mounted, i.e. they are fastened to the muting arm bracket and
only need to be mounted on the active or passive unit.
Two muting sensors for the active unit or 2 reflectors for the passive unit have been
attached and aligned on each pre-mounted muting arm.
Muting sensors detect material and supply the signals required by an evaluation unit for
the logical linking.
You can mount the muting arms on the following components of the protective device:
•
Active unit
•
Passive unit for short scanning ranges
PROJECT PLANNING
4
8024802/2020-07-17 | SICK
O P E R A T I N G I N S T R U C T I O N S | deTem4 LT Muting A/P
25
Subject to change without notice
