Advanced commissioning
7.5 Motor control
Select motor control
Vector control is already preset
To achieve a good controller response, you must adapt the elements marked in gray in the
figure in the overview diagram above. If you selected vector control as control mode in the
basic commissioning, you will have already set the following:
● The maximum speed for your application.
● The motor and current model: If the motor data in the inverter correspond to the motor
data on the rating plate, then the motor and current model in the inverter are correct and
the vector control can operate satisfactorily.
● The inverter calculates the torque limits matching the current limit that you have set for
the basic commissioning.
Regardless of it, you can also set additional positive and negative torque limits or limit the
power of the motor.
● The inverter has a preset speed controller with self-optimization (rotating measurement).
If you want to continue to optimize this setting, follow the instructions further down in this
chapter.
Select encoderless vector control
Set p1300 = 20.
Select vector control with encoder
Set p1300 = 21.
Optimizing the speed controller
Optimum control response - post optimization not required
Preconditions for assessing the controller response:
● The moment of inertia of the load is constant and does not depend on the speed
● The inverter does not reach the set torque limits during acceleration
● You operate the motor in the range 40 % … 60 % of its rated speed
If the motor exhibits the following response, the speed control is well set and you do not
have to adapt the speed controller manually:
The speed setpoint (broken line) increases with the set ramp
-
The actual value follows the setpoint without overshooting.
Converter with control units CU240D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB
153
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