Explanation of terms
Muting
Temporary by passing of a Light Curtain in order to transport
material into or out of the danger area.
Restart inhibit
Prevention of machinery from automatically resuming
operation.
Introduction
The Bernstein SCR OM muting controller with relay outputs is designed to be used with the new generation of
Bernstein safety light curtains, to safeguard operators from dangerous machinery up to safety category 4 as
described in EN 954-1. The integrated muting function, which has been designed to EN 61496, permits goods
to be transported into or out of the danger area without impairment to the safety function.
The SCR OM provides a safe method of providing a muting function, by the appropriate use of carefully
positioned sensors, either two or four, at the entrance / exit of the danger area, in such a way that only the
material being transported activates the sensors. Once the material has activated the muting sensors, the
SCR OM then initiates the muting cycle for the period during which the material is being transported through
the protected field.
The muting sensors are arranged in such a way as only the material can correctly activate the muting sensors,
and any person approaching the danger area will cause a shut down of the safety system.
A basic overview of the muting application is shown in the diagram below:
MS1
ML
MS2
MS3
Danger area
MS4
EST
ESS
MS1, MS2, MS3, MS4
Muting sensors
ML
Muting lamp
EST
Start
button
ESS
Key-operated
switch
3
