Servotronix CDHD2S User Manual page 225

Tuning
Perform an action and measure the resonance (oscillation frequency) of the current command
◼
(ICMD):
In the Range screen, right-click the ICMD plot.
⚫
Select FFT and Differentiation.
⚫
Select FFT tracking.
⚫
The FFT tracking will look like this, for example:
Set the value of parameter NLANTIVIBHZn to the peak or dominant resonance (in
◼
Hertz). In the example shown here, the value is 14Hz.
2. Set the narrowband center sharpness (width).
Set the value of parameter NLANTIVIBSHARPn according to the resonance sharpness
◼
(width) of the narrowband filter.
Estimate the width by comparing the plot in the FF Traking dialog box to the plot below, which
shows the NBF frequency response as a function of the NLANTIVIBSHARPn value. Typical setting
range is 0.1 to 1.0.
The figure below shows the narrowband filter frequency response.
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Figure 8-27 FFT tracking