Delta ASDA-B2 Series User Manual page 146

ASDA-B2
Resonance suppression with low-pass filter
Resonance
Gain
Resonance
Frequency
When the value of P2-25 is increased from 0, BW becomes smaller. Although it solves the
problem of resonance frequency, the response bandwidth and phase margin is reduced.
Also, the system becomes unstable.
If users know the resonance frequency, notch filter (parameter P2-23 and P2-24) can
directly eliminate the resonance. In this case, notch filter will be more helpful than low-pass
filter. However, if the resonance frequency drifts because of time or other factors, notch
filter will not do.
Revision May, 2018
Gain
Point
Attenuation
Rate -3db
0db
Low-pass
Frequency
Frequency
Chapter 6 Control Modes of Operation
.
Low-pass Filter
Gain
Cut-off Frequency
of Low-pass Filter
= 10000 / P2-25 Hz -
Frequency
Resonance
conditions
is suppressed
Low-pass
Frequency
Frequency
Resonance
.
Frequency
6-35