Delta ASDA-B2-F Series User Manual

Contents

ASDA-B2-F Control Mode of OperationSeptember, 2015 6-216Here illustrates the effect via low-pass filter (parameter P2-25). The following figure is the systemopen-loop gain with resonance.GainFrequencyWhen the value of low-pass filter (parameter P2-25) is increased from 0, BW becomes smaller(See the following figure). Although it improves the situation of resonance frequency, theresponse bandwidth and phase margin are reduced as well.If users know the resonance frequency, notch filter (P2-23 and P2-24) can directly eliminate theresonance. The frequency setting range of the notch filter is merely from 50 to 1000 Hz. Thesuppression strength is from 0 to 32 dB. If the resonance frequency is not within the range, it issuggested to use low-pass filter (P2-25) to decrease the resonance intensity.Here firstly illustrates the influence brought by notch filter (P2-23 and P2-24) and low-pass filter(P2-25). The following figures are the system of open-loop gain with resonance.Resonance suppression with notch filter:Resonance PointB.WResonanceFrequency+GainAttenuation RateP2-24ResonanceFrequency P2-23Frequency0 dbNotch FilterFrequencyGain=Resonance condition issuppressedB.WResonanceFrequencyGainFrequency0dB BWGainFrequency