Siemens SINAMICS G120 Operating Instructions Manual page 294

Advanced commissioning
6.7 Application-specific functions
Bypass function is dependent on the speed (p1267.1 = 1)
With this function, changeover to line operation is realized corresponding to the following
diagram, if the setpoint lies above the bypass threshold.
If the setpoint falls below the bypass threshold, the motor is captured by the inverter and
operates in inverter operation.
Figure 6-49
General properties of the bypass function
● The two motor contactors must be designed for switching under load.
● Contactor K2 must be designed for switching an inductive load.
● Contactors K1 and K2 must be mutually interlocked so that they cannot close at the same
time.
Switch off motor in bypass mode
● In bypass mode the motor no longer responds to the OFF1 command, but rather only to
OFF2 and OFF3.
● If you cut off power to the inverter in bypass mode, the bypass contactor opens and the
motor coasts down. If you want to operate the motor even when the inverter is switched
off, the signal for the bypass contactor must come from the superior controller.
294
Switchover behavior from inverter to line operation dependent on the speed
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB