7.11 Automatic restart
The softstarter automatically restarts the motor after a
fault has occurred.
The primary requirement is that if a fault or protection has
been asserted, the softstarter shall automatically restart
the motor in order to ensure an uninterrupted process.
The event is reset only after the Auto-reset delay time
has transpired. If Auto-restart is enabled, an internal
start signal is given and the fault relay is not directly
activated. This is because the fault relay can sometimes
be connected to a breaker located upstream.
Until a successful start is carried out, several attempts to
restart are made with a fixed time interval between each.
During the time between each restart, the start digital
input signal is ignored.
If the fault still remain by the time a restart is made, this
will be seen as a failed restart attempt.
The fault relay will only be activated after the maximum
number of restarts have failed.
If a stop signal is given, the auto-restart sequence is
aborted and the fault relay is not activated.
Automatic restart is configured with the following
parameters:
Parameter Description Setting range Default value
09.01 Auto-reset delay time Delay time after which the event is reset. 0 ... 3600 s 0 s
09.02 Auto-restart Enable auto-restart function. Off,On Off
09.03 Auto-restart max attempts Max number of auto-restart attempts. 1 ... 10 5
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