GE IS2020RKPSG1A Voltage monitoring module

If the velocity loop breaks into an oscillation at a frequency well above the calculated velocity loop bandwidth, a resonance problem may exist. A second symptom is that the frequency of oscillation is relatively constant in the presence of changes to ARF0 and ARF1.Two digital anti-resonant low-pass filters, ARF0 and ARF1, are included in the velocity loop. Their purpose is to lower the gain above fvc, especially at any resonant frequency greater than fvc so oscillations do not occur. Default values, also a function of the selected system response

If the velocity loop bandwidth 

cannot be raised to an acceptable value without encountering a resonant oscillation: 1. Set both ARF0 and ARF1 to 400 Hz and set KVP low enough to prevent oscillation. 2. Increase KVP slowly until oscillation at the resonant frequency just begins. 3. Reduce KVP slightly until the oscillation just stops. Compute the velocity loop bandwidth using the formula given at the beginning of this section. If the velocity loop bandwidth is less than .25 times the value of ARF0 and ARF1, then proceed to Step 4. Otherwise, go to Step 5. 4. Decrease both ARF0 and ARF1 by 20% and go back to Step 2. 5. The velocity loop bandwidth should now be approximately one quarter the value of ARF0 and ARF1. For margin, reduce KVP, ARF0, and ARF1 by 20%.

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