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
WARNING
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.
Flying restart – switching on while the motor is running (Page 303)
Using p1210, select the automatic restart mode that best suits your application.
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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.
Advanced commissioning
6.27 Automatic restart
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
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