Siemens SINAMICS G120D - Page 59

Commissioning
5.2 Preparing for commissioning
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
59
Vector control with encoder
Sensorless vector control
U/f control
With the position control, provides the best
results
Limited functionality of the position
control.
• Low accuracy
• Travel to fixed stop is not
possible
Not recommended in conjunction
with position control.
• Low accuracy
• Low dynamic response
• Travel to fixed stop is not
possible
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
less than one quarter of the rated inverter power)
● If several motors are connected to one inverter
● If a power contactor is used between the inverter and motor and is opened while the
motor is powered up
● If the maximum motor speed exceeds the following values:
Inverter pulse frequency
2 kHz
4 kHz and higher
Pole number of the motor
2-pole
4-pole
6-pole
2-pole
4-pole
6-pole
Maximum motor speed [rpm]
9960
4980
3320
14400
7200
4800