摘录文档如下：

If oscillation occurs at the controller output, measure the oscillation frequency. If the oscillation frequency remains the same at different motor speeds, the resonance is mechanical.

A bandstop filter can be activated to prevent excitation of mechanical resonance via the speed control circuit.

This is best done via the function mask "Current setpoint filter" in STARTER. Here, you can enter

? the type ("bandstop"),

? the stop frequency (set to between 5 and 10 % below the oscillation frequency),

? the bandwidth (< oscillation frequency, normally 10 % … 85 % of the stop frequency),

? and the notch depth (must be determined empirically; select as low a value as possible)

and "accept" as filter parameters. A reduction must not be entered because this would change the signal amplitude to above the stop frequency.

Certain parameters in the expert list can be used to track the filter setting:

p1656.0 = 1 = Filter 1 activated

p1657 = 2 = Filter type "Filter 2nd order" (bandstop is reached with p1658 = p1660)

p1658 = xx = Bandstop stop frequency

p1660 = xx = Bandstop stop frequency

p1659 = Numerator damping (was calculated from the bandwidth and the notch depth)

p1661 = Denominator damping (was calculated from the bandwidth and the notch depth)

The wider the bandwidth, the greater the effect of the filter, but also the more falsification of the speed signal.

Large bandwidths can produce instability in the speed control circuit at low resonant frequencies (reduce p1460!). The bandwidth must not be greater than the resonant frequency.

感觉有时候也不怎么好使，尽管用的少！