Siemens SINAMICS DCM Manual page 323

Commissioning
8.8 Manual optimization
Assessment
If the step response of the speed controller is recorded after performing the optimization run
for the speed controller, then the significant increase of the setpoint step can be clearly seen
- which is characteristic for optimization according to the symmetrical optimum.
A controller adjusted according to the symmetrical optimum has a significant overshoot,
however, a favorable response to disturbances.
This optimization has especially established itself in drive technology as many systems
require a good disturbance variable compensation. This is the reason why the optimization
run for the speed controller sets the controller parameters according to the symmetrical
optimum.
An improved response to setpoint changes with the response to disturbances remaining the
same can be achieved using the reference model. See Chapter "Function descriptions",
Section "Speed controller".
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Operating Instructions, 02.2015, A5E34763375/RS-AA/001
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SINAMICS DCM DC Converter