Siemens SINAMICS G120P, Operating Instructions Manual

Page: 358 / 496

Functions
7.5 Motor control
Inverter cabinet units
358
Operating Instructions, 12/2014, A5E32923362A
7.5.2.2 Select motor control
Speed 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 speed control as control mode in the
basic commissioning, you will already have set the following:
● The maximum speed for your application.
● The motor and current model: If the motor data in the inverter corresponds to the motor
data on the type 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 the limit, you can also set additional positive and negative torque limits or
limit the power of the motor.
● The motor identification (MotID) is mandatory (default setting); the automatic closed-loop
speed controller optimization is recommended (in addition, the magnetization current is
determined and the closed-loop speed controller optimized).
● Read the description later in this section if you want to further optimize these settings.
7.5.2.3 Optimizing the closed-loop speed controller
Recommendation
Automatic closed-loop speed controller optimization is recommended (p1900 = 3).
Optimum control response - post optimization not required
You do not have to manually adapt the speed closed-loop controller if, after the speed
controller self optimization, the motor manifests the following acceleration response:
Optimum control response for applications
that do not permit any overshoot.
The actual value approaches the setpoint
without any significant overshoot.
Optimum control response for fast correction
and quick compensation of noise compo-
nents.
The actual value approaches the setpoint
and slightly overshoots (maximum 10% of
the setpoint step).