Delta ASDA-B2-F Series User Manual page 111

Control Mode of Operation
Resonance suppression with low-pass filter:
Gain
6
When the value of low-pass filter (P2-25) is increased from 0, B.W. becomes smaller. Although it
improves the situation of resonance, the response bandwidth and phase margin are reduced as
well. Also, the system becomes unstable. If users know the resonance frequency, notch filter
(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 be preferable.
6-22
Gain
Resonance Point
0 db
+
B.W
Frequency
Resonance
Frequency
Attenuation Rate -
Low-pass filter
3dB
Cut-off frequency of
low-pass filter
=1000/P2-25Hz
Frequency
Gain
Resonance condition is
suppressed
=
B.W
Resonance
Frequency
ASDA-B2-F
Frequency
September, 2015