Automatic Restart - Siemens SINAMICS S120 Function Manual

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Automatic restart

The automatic restart function is used to automatically restart the drive / drive line-up, e.g.

when the power is restored after a power failure. In this case, all of the faults present are

automatically acknowledged and the drive is powered-up again. This function is not only

restricted to line supply faults; it can also be used to automatically acknowledge faults and to

restart the motor after any fault trips.

In order to allow the drive to be powered-up while the motor shaft is still rotating, for a

"VECTOR" drive object, the "flying restart" function should be activated using p1200. Before

the automatic restart commences, it must be ensured that the returning supply voltage is

available and is present at the infeed.

On this subject, also note the information in Section Infeed switch on by a drive (Page 914).

Automatic restart functions in servo control and vector control and for infeeds with infeed

After the line supply voltage is connected, Smart Line Modules 5kW/10kW automatically

When the automatic restart function is activated, then the system also restarts after the

Control Unit powers up if there is still an ON signal.

If p1210 is set to the value > 1, the Line Module / motors can start automatically once the

line supply has been re-established. This is especially critical if, after longer line supply

failures, motors come to a standstill (zero speed) and it is incorrectly assumed that they have

been powered-down.

Unplanned motion when the automatic restart function is active

When the automatic restart is activated, when the line supply returns, unexpected motion

can occur that may result in death or serious injury.

• Take the appropriate measures on the plant/system side so that there is no safety risk

Drive functions

Function Manual, 11/2017, 6SL3097-4AB00-0BP5

as a result of an unexpected restart.

Basic functions

7.11 Automatic restart

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