Chapter 6 Control Modes of OperationASDA-B Series

P2 - 25

NLP

Low-pass Filter Time Constant

Communication Addr.: 0219H

(Resonance Suppression)

 

 

Default: 20

Related Section:

Applicable Control Mode: P/S/T

Section 6.3.7, P2-32

Unit: 0.1ms

 

Range: 0 ~ 10000

 

Settings:

 

 

This parameter is used to set low-pass filter time constant of resonance suppression.

0: Disabled

Use Notch Filter to suppress resonance

Gain

Resonance

Point

 

Low-pass

 

Frequency

Resonance

Frequency

Frequency .

 

 

 

 

Resonance

Gain

Gain

 

conditions

 

is suppressed

Notch Filter

 

 

 

 

 

0db

 

 

Low-pass

Attenuation

 

 

 

 

Frequency

Rate P2-24

 

 

 

Resonance

Frequency

Resonance

Frequency

Frequency

 

Frequency .

P2-23

 

 

 

Use Low-pass Filter to suppress resonance

Gain

Resonance

Gain

Point

 

Low-pass

0db

 

 

 

Frequency

 

Resonance

Frequency

 

Frequency

 

 

 

 

 

 

.

 

 

 

 

 

 

 

 

Resonance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low-pass Filter

Gain

 

 

 

 

 

conditions

 

 

 

 

 

 

 

 

 

 

 

Attenuation

 

 

 

 

 

is suppressed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rate -3db

 

Cut-off Frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of Low-pass Filter

 

 

 

 

 

Low-pass

 

 

 

 

 

= 10000 / P2- -25 Hz

 

 

 

 

 

Frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Resonance

 

 

 

Frequency

 

 

 

 

 

 

 

 

 

 

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 figures above). 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.

6-24

Revision January, 2009

Page 139
Image 139
Delta Electronics ASDA-B Series Nlp, Use Notch Filter to suppress resonance, Use Low-pass Filter to suppress resonance

ASDA-B Series specifications

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