Siemens SINAMICS S120 Function Manual page 125

Limitations:
● Because of the operating principle, the base adaptation algorithm can work reliably with
● Because of the operating principle, inaccuracies can occur during the adaptation of the
● Stepped setpoint changes of the speed or velocity can cause unwanted movements of
● If in addition to a variable mechanical resonance frequency, the system also contains
Figure 4-11 Example: Current setpoint filter 5 is the last filter used in the cascade
Internal activation threshold
The internal activation threshold can be weighted via parameter p5284:
● If the adaptation reacts too sensitively to other disturbances such as jumps in the speed
● If the adaptation is too insensitive and resonance frequencies do not occur despite strong
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
systems that have only one mechanical resonance frequency. Undesirable movements of
the adapted filter between the resonances can occur for systems with several mechanical
resonance frequencies.
blocking frequency. In such cases, the resonance frequency is only partly suppressed.
This is particularly the case for encoders with poor resolution (e.g. resolvers). These
inaccuracies can be reduced by increasing the actual speed value smoothing time
constant in parameter p1441.
the adaptive current setpoint filter.
non-variable mechanical resonance frequencies, the non-variable frequencies must be
suppressed with fixed current setpoint filters. The adapted bandstop filter should be the
last filter in the filter cascade of the bandstop filters. Otherwise the adaptation may be
subject to interference from non-variable resonance frequencies, which may cause
unwanted movements of the blocking frequency.
or load torque, the activation threshold should be set high.
excitation, the activation threshold can be reduced.
Servo control
4.8 Autotuning
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