Delta Electronics ASDA-B2 series User Manual page 149

Chapter 6 Control Modes of Operation
Use Notch Filter to suppress resonance
Resonance
Gain
Point
Low-pass
Frequency
Resonance
Frequency
.
Use Low-pass Filter to suppress resonance
Resonance
Gain
Point
Low-pass
Frequency
Resonance
Frequency
When the low-pass filter (parameter P2-25) is adjusted from 0 to high value, the value
of Low-pass frequency will become smaller (see the figure on page 6-26). The
resonant condition is improved but the frequency response and phase margin will also
decrease and the system may become unstable. Therefore, if the users know the
resonance frequency, the users can eliminate the resonance conditions directly by
using notch filter (parameter P2-23, P2-24). Usually, if the resonant frequency can be
recognized, we recommend the users can directly use notch filter (parameter P2-23,
P2-24) to eliminate the resonance. However, if the resonant frequency will drift or drift
out of the notch filter range, we recommend the users not to use notch filter and use
low-pass filter to improve resonant conditions.
6-34
info@varitel.com - www.varitel.com - Tel. (54) 11-4243-1171 / Fax: (54) 11-4292-7545
Manuel Baliña 456, Lomas de Zamora (B1832CCJ) Buenos Aires, Argentina.
VARITEL INGENIERIA ELECTRONICA S.A.
Gain
0db
Attenuation
Rate P2-24
Frequency
Gain
Attenuation
Rate -3db
0db
Frequency
Gain
Notch Filter
Frequency
Resonance
Frequency
P2-23
.
Low-pass Filter
Gain
Cut-off Frequency
of Low-pass Filter
-
= 10000 / P2-25 Hz
Frequency
ASDA-B2
Resonance
conditions
is suppressed
Low-pass
Frequency
Frequency
Resonance
Frequency .
Resonance
conditions
is suppressed
Low-pass
Frequency
Frequency
Resonance
.
Frequency
Revision September 2013