Siemens SINAMICS G120 Operating Instructions Manual page 193

Protection of the drive and the driven load
The protection functions prevent damage to the motor, inverter and driven load.
The monitoring of the driven load prevents impermissible operating modes, e.g. dry-running
of a pump.
Increasing the drive availability
The kinetic buffering converts the kinetic energy of the load into electrical energy to buffer short-
term power failures.
The "Flying restart" function permits the fault-free switching on of the motor while it is still
turning.
For active automatic restart, after a power failure, the inverter attempts to automatically restart
the motor and to acknowledge any faults that occur.
Energy saving
For standard induction motors, the efficiency optimization reduces the motor losses in the
partial load range.
The "Bypass" function switches the motor between inverter and line operation.
If the plant/system conditions permit, the inverter switches off the motor temporarily.
If necessary, the main contactor control disconnects the inverter from the power system and
so reduces the inverter losses.
The inverter calculates how much energy controlled inverter operation saves when compared
to mechanical flow control (e.g. throttle).
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Electrically braking the motor (Page 311)
Overcurrent protection (Page 321)
Inverter protection using temperature monitoring (Page 322)
Motor protection with temperature sensor (Page 325)
Motor protection by calculating the temperature (Page 328)
Motor and inverter protection by limiting the voltage (Page 331)
Monitoring the driven load (Page 333)
Flying restart – switching on while the motor is running (Page 340)
Automatic restart (Page 342)
Kinetic buffering (Vdc min control) (Page 346)
Efficiency optimization (Page 348)
Bypass (Page 351)
Hibernation mode (Page 357)
Line contactor control (Page 362)
Advanced commissioning
6.1 Overview of the inverter functions
193