Automatic Restart - Siemens SINAMICS G120C USS/MB Operating Instructions Manual

6.27

Automatic restart

The automatic restart includes two different functions:
● The inverter automatically acknowledges faults.
● After a fault occurs or after a power failure, the inverter automatically switches-on the motor
again.
The inverter interprets the following events as power failure:
● The inverter signals fault F30003 (undervoltage in the DC link), after the inverter line voltage
has been briefly interrupted.
● All of the inverter power supplies have been interrupted - and all of the energy storage
devices in the inverter have discharged to such a level that the inverter electronics fail.
Setting the automatic restart function
Unexpected machine motion caused by the active automatic restart function
When the "automatic restart" function is active (p1210 > 1), the motor automatically starts
after a line supply phase. Unexpected movement of machine parts can result in serious injury
and material damage.
● Block off hazardous areas within the machine to prevent inadvertent access.
If it is possible that the motor is still rotating for a longer period of time after a power failure or
after a fault, then you must also activate the "flying restart" function.
Using p1210, select the automatic restart mode that best suits your application.
Figure 6-63 Automatic restart modes
The principle of operation of the other parameters is explained in the following diagram and in
the table below.
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
WARNING
Flying restart – switching on while the motor is running (Page 303)
Advanced commissioning
6.27 Automatic restart
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