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ASDA-A3

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Tuning

5.7.1 Notch filter

5.7.1.1 Function restriction

1. The Notch filter frequency settings (P2.023, P2.043, P2.045, P2.098, and P2.101) must be

2 times (or more) the speed loop bandwidth (P2.004 / 2π), or it might lead to system

divergence.

2. It is recommended that the notch depth (magnitude) of the resonance point should remain

at -15 to -10 dB after resonance suppression.

Note: it is recommended that you set the Analysis Type to Speed Open-loop in the System Analysis of

ASDA-Soft; the zero-crossing frequency is the speed loop bandwidth.

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5.7.1.2 Function description

The servo provides 5 sets of notch filters with the frequency setting range of 50 to 5000 Hz.

Each set of notch filter supports the function of auto resonance suppression (P2.047 and

P2.048). In addition, you can suppress the resonance manually. The precautions and operation

procedure for manual resonance suppression are as follows.

 Use the System Analysis function in ASDA-Soft V6 to find the resonance frequency.

 The sudden loss of load inertia (weight) is likely to cause resonance. It is advisable to tune

the servo drive at maximum load.

 If the resonance frequency is incorrectly set, the noise and vibration might be worse.

 The higher the attenuation level and Q factor, the better the effect of resonance

suppression. However, if the values are set too high, it results in phase lag and causes

resonance at other frequencies.

Flowchart of manual resonance suppression:

Use the System Analysis in ASDA-Soft to

display the resonance frequency point.

The motor accelerates and

decelerates alternatively.

No

High-frequency

resonance?

Yes

According to the value displayed in the

ASDA-Soft, set the resonance frequency in

P2.023 and set the initial value of P2.024 to 4.

Resonance

eliminated?

Yes

Complete

No

Constantly increase

the notch depth

(P2.024).

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