Commissioning
8.9 Manual optimization
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
347
Optimizing the speed controller
Basic information
The objective of the closed-loop control is to compensate the system deviation as a result of
changes to the setpoint and disturbances.
The evaluation is performed in the time domain:
● The control loop fulfills the requirement for steady-state accuracy, if the system deviation
as a result of a setpoint step (reference input) converges towards zero. The rise time t
an
and settling time t
aus
specify the speed.
● The overshoot defines the damping. For a step change of the setpoint or disturbance
variable, the controlled variable must not excessively overshoot the steady-state final
value.
Figure 8-44 Setpoint step to evaluate a controller
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