28 8540573 • 16/09/2016 • Rev.20
MUTING OVERRIDE FUNCTION (“M” MODELS)
The OVERRIDE function must be used when the machine stops due to incorrect Muting
activation sequences with the material obstructing the guarded opening.
In this situation, the OSSD outputs are not active as the light curtain and/or at least one Muting
sensor is occupied. In this condition the OVERRIDE request led blinks (ref.Table 5).
This function activates the OSSD outputs making it possible to remove the material that is
obstructing the opening concerned; moreover the Muting lamp lights on.
Throughout the entire phase during which the OVERRIDE function is active, the
OVERRIDE/MUTING light is ON. Check efficiency of this light periodically (during the Muting
or Override phases).
Warning!! The Override with pulse command automatically activates the outputs of the light
curtain until both the light curtain and the muting sensors are free of obstacles again. During
this period, the light curtain is unable to protect access to the guarded opening. Therefore, all
operations must be carried out under the strict supervision of expert personnel.
The operator will use the Override mode previously selected (ref. Table 14).
1. Override with continuous action command
2. Override with pulse command
Override with continuous action command
This function is activated driving pins 16 and 17 of the receiver to +24VDC at the same time
(maximum delay = 400ms) using a 2-way key selector with spring return;
The maximum override duration is 15 minutes; it can be stopped for two different causes.
When the selector is released or if the 15 minutes has been elapsed, override
ends, de-activating the OSSD outputs, turning off the muting lamp and showing
normal condition on the display. A new override condition can be started, releasing
and rearming the selector.
Once the opening has been cleared and the sensors are free again, override
ends and GUARD condition (light curtain in normal operation) is activated without
necessity of further commands.
Override with pulse command
This function is activated inverting (maximum delay = 400ms) the condition of pin 16 and 17 of
the receiver using a push button (switch). During the override the 16 and 17 are not controlled.
The override condition can last a maximum of 15 minutes (repeatable).
The function can only be re-started by pressing the pushbutton again (subject to the following
conditions) :
1. Maximum total OVERRIDE time (after n consecutive requests) = 60 min
2. Maximum number of consecutive requests for OVERRIDE = 30.
The override condition ends when the barrier and sensors are cleared (entrance clear) and the
GUARD condition is re-enabled (barrier fully operational) without sending any further commands.
The timer (point 1) and counter (point 2) are reset when one of the following conditions occurs:
A correct muting sequence.
A system reset (switched off and then turned on).
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