Setpoint Step Change For The Speed Controller - Siemens SINAMICS DCM 6RA80 Faq

check e.g. p50480 = 40%. The point of transition from discontinuous to continuous current is
influenced by the inductance in the load circuit and is approx. 30 % of the rated motor
current (test for any system-related deviations). Perform controller optimization with Kp,
p50155 and Tn, p50156 in the continuous current range.
If F60031 occur increase p50388.
Optimization is performed based on the absolute value optimum.
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4
Automatic current controller
optimization
Setpoint step-change from 40 to
50 % current setpoint (orange);
Actual current value (blue)

Setpoint step change for the speed controller:

p50625 = 52208, couple output of square-wave generator with input of speed controller.
Sheet 6810.
Activate field with p50082, enter ON command and operating enable via terminal X177.12
and 13. Record step response.
E.g. step response from 15% to 18% speed setpoint.
Perform controller optimization with Kp, p50225 and Tn, p50226.
Optimization is performed based on symmetrical optimum, see below.
Test affect of filtering on p50228, optimum conditions (only slight overshooting) occur when
the filter time p50228 is equal to the reset time Tn (p50226) of the speed controller.
Notice: The setting for p50226 is in s, the setting for p50228 is in ms.
When F60031 occur increase p50388.
3
4
Automatic current controller
optimization
Setpoint step change from 40 to
50 % with current setpoint
filtering
P50191 = 9 ms
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