3
OPERATING MODES.
The AU S-TWIN control unit is capable of three different operating modes:
manual, manual with conditional test and automatic.
Manual Operation.Manual Operation.
When the machine is turned on and the danger zone is clear, the unit is
set to CLEARCLEAR with the internal relays A and B open.
F
To close relays A and B and set the unit to GUARD status,To close relays A and B and set the unit to GUARD status,
actuate the test command.actuate the test command.
During normal operation, each time the danger zone is intercepted the
unit moves from GUARD status to BREAK and automatically tests the
opening time of the internal relays A and B; when the danger zone is
cleared the unit moves to CLEAR status (danger zone clear and internal
relays A and B open).
Actuate the test command in order to close relays A and B and reset the
unit to GUARD status.
The test command is always enabled at all points of the machine cycle
provided that the danger zone is clear.
Manual Operation – Conditional Test.Manual Operation – Conditional Test.
The test function is only enabled following the interception and
subsequent clearing of the danger zone. This function is therefore only
active in CLEAR status (danger zone clear and internal relays A and
B open).
This option proves useful when a test command must be sent
simultaneously to more than one control unit, by means of a single
centralised command, and must only affect those units that are in CLEAR
status, while remaining transparent for units that are in GUARD status.
F
Since in this case the test command is only secure (for all theSince in this case the test command is only secure (for all the
units) when the machine is first turned on and before the firstunits) when the machine is first turned on and before the first
dangerous movement, this option can only be used if thedangerous movement, this option can only be used if the
operator is certain that it is compatible with the risk level ofoperator is certain that it is compatible with the risk level of
the application.the application.
Automatic Operation.Automatic Operation.
When the system is turned on, it automatically generates the test function
without any external command.
F
If, when the system is turned on, the zone is engaged, theIf, when the system is turned on, the zone is engaged, the
system is set to the locked condition. In this case, it can besystem is set to the locked condition. In this case, it can be
reset by clearing the zone and then stopping and restartingreset by clearing the zone and then stopping and restarting
the system.the system.
During normal operation, each time the danger zone is intercepted the
unit moves from GUARD status to BREAK status and automatically tests
the opening time of the internal relays A and B; when the danger zone is
cleared the unit automatically moves from BREAK status to GUARD status
without executing any further system controls.