Maxsine EP3 AC Series, User Manual

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Chapter 4 Running
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4.7.2 Notch filters
The notch filters are not active by default. By setting the parameter P200~P205, two notch
filters can be used at the same time and can suppress two kind of different frequency resonance. If
the resonance frequency is known, then by using the notch filter the resonance can be eliminated
directly. It has better effect than by using the low pass filter. When resonance frequency is
unknown, may gradually reduce the notch frequency from high to low, the notch frequency will
be the optimum setting value while the vibration is smallest. If resonance frequency changes with
time or other factor and the frequency displacement is too large, therefore it is not suitable to use
the notch filter.
Except frequency, but also may adjust the notch depth and the quality factor and must pay
attention to the setting values to be appropriate. If the notch depth is deep, the suppression effect
on the mechanical resonance is possibly good, but can create the phase changing in a big way,
sometimes can strengthen the vibration instead. The smaller the quality factor, the wider notch
width achieves, and the mechanical resonance suppression effect is quite good, but can create the
phase changing in big region, sometimes can strengthen the vibration instead.