6.19
Motor control
The inverter has two alternative methods to control (closed loop) the motor speed:
● U/f control
● Vector control
6.19.1
Reactor, filter and cable resistance at the inverter output
Correctly setting the components between the inverter and motor
Components between the inverter and the motor influence the closed-loop control quality of
the inverter:
● Output reactor or sine-wave filter
In the factory setting, for the motor data identification, the inverter assumes that neither
output reactor nor sine wave filter are connected at to the inverter output.
● Motor cable with unusually high cable resistance.
For the motor data identification, the inverter assumes a cable resistance = 20 % of the
stator resistance of the cold motor.
You must correctly set the components between the inverter and motor to achieve an optimum
closed-loop control quality
Setting the reactor, filter and cable resistance between the inverter and motor
Procedure
Proceed as follows to set the reactor, filter and cable resistance between the inverter and motor:
1. Set p0010 = 2.
2. Set the cable resistance in p0352.
3. Set p0230 to the appropriate value.
4. Set p0235 to the appropriate value.
5. Set p0010 = 0.
6. Carry out the quick commissioning and the motor identification again.
You have set the reactor, filter and cable resistance between the inverter and motor
Advanced commissioning
6.19 Motor control
SINAMICS G120C converter
258
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
