Siemens SINAMICS DCM Manual page 322

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8.8.3 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
and settling time t
● 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
Controller optimization
Procedure
● Set the function generator to a triangular waveform with
step height = 5 %
offset = 10 %
period = 1000 ms
pulse width = 500 ms
● Supply point: p50625[C] (see function diagram 6810)
● Record signals r52174 (n-set) and r52167 (n-act)
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
Change controller parameters Kp (p50255) and Tn (p50256) until the step re-
sponse provides a satisfactory result.
The field current controller adaptation can be activated (see function chart 6908)
to eliminate the influence of non-linearity of the field inductance and gating unit.
specify the speed.
aus
Setpoint step to evaluate a controller
ac.maher.co.ir
Commissioning
8.8 Manual optimization
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