Siemens SINAMICS G120 Operating Instructions Manual page 186

Functions
8.6 Motor control
It is not permissible to use vector control in the following cases:
● If the motor is too small in comparison to the inverter (the rated motor power may not be
● If several motors are connected to one inverter
● If a power contactor is used between the inverter and motor and is opened while the
● If the maximum motor speed exceeds the following values:
Pole number of the motor
Maximum motor speed [rpm]
184
less than one quarter of the rated inverter power)
motor is powered up
Inverter pulse frequency 2 kHz
2-pole 4-pole 6-pole
9960 4980 3320
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
4 kHz and higher
2-pole 4-pole 6-pole
14400 7200 4800
SINAMICS G120C Inverter