Leuze electronic
MSI 420.TMC-03
5
3
Description of functions
By means of muting, the protective function of the safety sensor can be temporarily and properly
suppressed, e.g. if objects are to be transported out of the danger zone through the protective field. The
OSSDs of the MSI 420.TMC-03 remain in the ON state in spite of interruption of the protective sensor.
3.1
Arrangement of the muting sensors
Muting sensors detect the transport material and supply the signals necessary for muting. Standard
IEC 62046 provides basic information on arranging the muting sensors. This information must be observed
when mounting the muting sensors.
Operation of the MSI 420.TMC-03 is described below based on the various phases of the muting process.
3.2
Signals
Table 3.1:
Signals
WARNING
Serious accidents caused by incorrect set-up!
If the distance between transmitter and receiver is larger than the width of the object so that gaps of more
than 180 mm are created, suitable measures, e.g. through additional guarding, must be taken to stop the
dangerous movement before persons enter the area.
Make sure that no persons can reach the danger zone alongside the transport material during muting.
Make sure that muting is only temporarily activated and only as long as the access to the danger zone
is blocked by the transport material.
NOTE
If accessible distances exist between the transport material and the safety sensor, PS mats or wicket
gates monitored with safety switches have been tried, tested and proven as additional safeguards. Such
measures prevent injuries caused, for example, by crushing in the access area.
WARNING
Unintentionally triggered muting may result in serious injury!
Mount the muting sensors in such a way that muting cannot be unintentionally triggered by a person,
e.g. by simultaneously activating the muting sensors with a foot.
Mount the muting indicator so that it is always visible from all sides.
WARNING
Risk of death through inadequate protection of the muting sensors!
Protection against unintended initiation of the (permanent) bridging through mechanical damage and/
or misalignment of muting sensors (acc. to IEC 62046).
Signals at MSI 400
Source
Description
Control 1
Input
E.g. standard PLC
(source A)
Preparations for muting
Control 2
Input
E.g. motor contactor of
conveyor belt (source B)
Preparations for muting
