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6.9.2
Automatic restart
Overview
The automatic restart includes two different functions:
● The converter automatically acknowledges faults.
● After a fault occurs or after a power failure, the converter automatically switches-on the
motor again.
The converter interprets the following events as power failure:
● The converter signals fault F30003 (undervoltage in the DC link), after the converter line
voltage has been briefly interrupted.
● All the converter power supplies have been interrupted and all the energy storage devices
in the converter have discharged to such a level that the converter electronics fail.
Function description
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 6-88
Automatic restart modes
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
WARNING
Flying restart – switching on while the motor is running (Page 423)
Advanced commissioning
6.9 Drive availability
425
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