Delta ASD-A2 Series User Manual page 198

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Chapter 6 Control Mode of Operation

Here illustrates the effect via low-pass filter (parameter P2-25). The following diagram is the

system open-loop gain with resonance.

When the value of P2-25 is increased from 0, BW becomes smaller (See as the following diagram).

Although it solves the problem of resonance frequency, the response bandwidth and phase margin

If users know the resonance frequency, notch filter (parameter P2-23 and P2-24) can directly

eliminate the resonance. The frequency setting range of notch filter is merely from 50 to 1000Hz.

The suppression strength is from 0 to 32dB. If the resonance frequency is not within the range, it is

suggested to use low-pass filter (parameter P2-25).

Here firstly illustrates the influence brought by notch filter (P2-23 and P2-24) and low-pass filter

(P2-25). The following diagrams are the system of open-loop gain with resonance.

Resonance suppression with notch filter

is suppressed

Notch Filter

Revision February, 2017

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