Delta Electronics ASDA-B2 series User Manual page 148

ASDA-B2
Low-pass filter
Please use parameter P2-25. The figure below shows the resonant open-loop gain.
Gain
When the low-pass filter (parameter P2-25) is adjusted from 0 to high value, the value
of Low-pass frequency (BW) will become smaller (see the figure below). The resonant
condition is improved and the frequency response and phase margin will also
decrease.
Gain
0dB
Notch Filter
Usually, if the users know the resonance frequency, we recommend the users can
eliminate the resonance conditions directly by using notch filter (parameter P2-23, P2-
24). However, the range of frequency setting is from 50 to 1000Hz only and the range
of resonant attenuation is 0~32 dB only. Therefore, if the resonant frequency is out of
this range, we recommend the users to use low-pass filter (parameter P2-25) to
improve resonant condition.
Please refer to the following figures and explanation to know how to use notch filter
and low-pass filter to improve resonant condition.
Revision September 2013
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.
Chapter 6 Control Modes of Operation
BW
Frequency
Frequency
6-33