Siemens SINAMICS G120 Operating Instructions Manual page 175

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 independently restart
the motor and to acknowledge any faults that occur.
Energy saving
If necessary, the main contactor control disconnects the inverter from the power system and
so reduces the inverter losses.
The inverter calculates the amount of energy the controlled inverter operation saves compared
with a mechanical flowrate control.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
Inverter protection using temperature monitoring (Page 313)
Motor protection with temperature sensor (Page 316)
Motor protection by calculating the temperature (Page 319)
Motor and inverter protection by limiting the voltage (Page 322)
Monitoring the driven load (Page 324)
Kinetic buffering (Vdc min control) (Page 339)
Flying restart – switching on while the motor is running (Page 333)
Automatic restart (Page 335)
Line contactor control (Page 341)
Calculating the energy saving for fluid flow machines (Page 343)
Advanced commissioning
6.1 Overview of the inverter functions
175