Reer ARGOLUX AU S3M2, Инструкция по установке, эксплуатации и обслуживанию, Страница: 6 / 32

6
Muting function. Muting function.
The muting function (temporary bypassing of the light barrier) is
indispensable when transit of material to the danger area through the
access protected by the light barrier must not cause stoppage of the
machine and consequent restart preceded by the test command.
According to safety regulations, the muting function can be activated only
if two signals are present, at least one of which must be of the hardware
type, i.e. coming from a field sensor.
An additional sensing system
(muting sensors) (muting sensors) is therefore required which,
if configured correctly, provides the control unit with information (muting (muting
signals) signals) regarding transit of the material "authorized" to access the
danger area.
The control unit activates and de-activates the muting function only with
the correct muting sequence, characterized by a specific signal timing, at
its inputs.
During the period in which the function is active, the AU S3M2 control
unit is in muting status and, although it detects occupation of the light
barrier, does not generate the signal which, in any other condition, would
cause stopping of the machine. The presence of material at the access
point controlled must prevent operator access to the danger area.
As contemplated by safety regulations, muting status is indicated externally
by an indicator light located close to the dangerous access point. The AU
S3M2 control unit is complete with an output for connection of this light
and is able to check that this is present and working correctly.
When the control unit receives an incorrect muting sequence, to be
ascribed for example to a sensor or light barrier malfunction, or if it
detects a malfunction of the muting indicator device, it promptly de-
energizes its internal relays A and B and switches to fail muting status fail muting status ,
indicated by a specific light.
The AU S3M2 control unit manages the muting function using 2 or 3
inputs to which sensors with relay output or sensors with PNP static type
output can be connected (table 1, page 6). In particular, switching must
be of the
DARK ON DARK ON type.
To activate the muting function, the material that passes through the
dangerous access point must be detected by both sensor 1 and sensor 2.
After detecting a change of state of a sensor, if the other sensor changes
state
within 4 seconds, within 4 seconds, the control unit activates the muting function.
The control unit de-activates the muting function as soon as one of the
sensors is cleared. Muting sensors 1 and 2 must therefore be constantly constantly
engaged by the material during the entire period in which the muting
function is to remain active because the light barrier is occupied by the
material.