Siemens SINAMICS G120 Operating Instructions Manual page 352

Advanced commissioning
6.36 Bypass
The motor is now operated directly on the line supply. A multiple of the motor rated current
can flow before the motor speed has reached the line frequency.
Switching from line operation to inverter operation
1. The inverter opens the K2 line contactor via a digital output.
2. The inverter waits for the unlocking time of the motor.
3. The inverter waits for the feedback that the K2 line contactor is open.
4. The inverter closes the K1 inverter contactor via a digital output.
5. The inverter switches the motor ON.
6. The inverter adjusts with the "Flying restart" function its output frequency to the speed of
the motor.
The motor is now operated on the inverter.
How is the changeover triggered?
The following options are provided to switch between inverter operation and line operation:
● Changeover for activation via a control command
● Changeover depending on the speed
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Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE