Siemens SINAMICS G120 Original Instructions Manual page 311

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 8-35 Switchover behavior from inverter to line operation dependent on the speed
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
Setting functions
8.7 Application-specific functions
311