Lower And Upper Limit Frequencies; Remedy For Insufficient Adaptation - Siemens SINAMICS S120 Function Manual

Servo control
4.8 Autotuning
4.8.3.4

Lower and upper limit frequencies

Parameter p5283 for the upper limit frequency has an internal upper limit that depends on
the settings for the adapted current setpoint filter. It is only active with an active adaptation.
● If the adaptation is active, p5283 is limited immediately to this internal value when written.
● If the adaptation is not active, p5283 is automatically limited to the internal value when the
adaptation is activated.
For the case that one of the limit frequency parameters (p5282 or p5283) is written and the
current blocking frequency of the bandstop filter is beyond the relevant new limit frequency,
the following applies:
● If the adaptation is active, the bandstop filter is automatically set to the relevant limit
frequency when p5282 or p5283 is written.
● If the adaptation is not active, the bandstop filter is automatically set to the relevant limit
frequency when the adaptation is activated.
4.8.3.5

Remedy for insufficient adaptation

Generally, the following is valid: If the adaptation does not change the blocking frequency of
the adapted current setpoint filter during operation, then the resonance is obviously not
strong enough and therefore has no negative effect on the operation.
If you still want to change the behavior of the adaptation, you have the following options:
● Change the activation threshold (p5284).
● Change the blocking frequency in the relevant filter parameters in order to obtain a
different start value for the adaptation.
● Increase the speed controller gain via p1460 or p5272. This excites the mechanical
resonance frequency more strongly, to which the adaptation then reacts. However,
observe the stability of the control loop with this setting.
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Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions