Muting - Datasensing SH4 ADVANCED Product Reference Manual

FUNCTIONS

MUTING

Muting function allows automatic deactivation of the safety function on the whole or
part of protected height in order to carry out definite cyclical operations without block-
ing machine work.
As the pertaining safety requirements demand, ESPE is equipped with up to four muting
activation inputs.
The Muting sensors must be able to recognize the passing material (pallets, vehicles, ...)
according to material's length and speed.
In case of different transport speeds in the Muting area, it is necessary to consider their
effect on the total Muting duration.
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Figure 38: L-shaped version with
integrated Muting sensors for
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SH4 ADVANCED
The Muting function excludes the light curtain during functioning, maintaining
active the OSSDs outputs, according to particular operating requirements (see fig-
ures below).
unidirectional Muting
On SH4 Advanced up to 4 muting inputs can be configured for the activation of
muting function according to the current Standards.
This function is particularly suitable when an object, but not a person, has to pass
through the dangerous area, under certain conditions.
It is important to remember that the Muting function represents a forced condi-
tion of the system and therefore has to be used with the necessary precautions.
If MUTING activation inputs are activated by Muting sensors or actuators, these
should be correctly connected and positioned in order to avoid undesired Muting
or potentially dangerous conditions for the operator.
State of Muting is signaled by an optional external Muting Lamp (connection and
integrity check both configurable) and by modules status LEDs on the user inter-
face. When the Muting function is ON the LAMP and the LEDs begin to blink.
If lamp integrity check is configured and the external lamp is broken and/or not
connected, the Muting request causes a SAFE lockout condition and the corre-
sponding failure is signaled.
If both first and last beams are intercepted by the passing material the light cur-
tain recovery time may be longer.
WARNING: Select carefully the configuration, as a wrong configuration can
cause the incorrect functioning of the Muting function and a reduction of
the safety level.
For correct use of Muting, please refer to the relevant reference standards.
The Muting sensors must be positioned in such a way that the activation of
the Muting function is not possible with the accidental passing of a person.
Particular attention must be paid to the use of the one-way L-Muting mode:
the external Muting sensors or the SH-L-ARMS Muting arms must be posi-
tioned so as to allow only the passage of material coming out of the dan-
gerous area protected by the light curtain.
Figure 39: T-shaped version with
integrated Muting sensors for
bidirectional Muting
Figure 40: Linear version with
external Muting sensors