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VFD motor controller help needed

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JHovel:
...andthe likely reason you measured 90V across the phases is that your multimeter is designed to averageout sinus wave forms and the VFD produces only a rough approximation with steep steps up and down and the multimeter can't follow that fast and shows you the average of it 'sees'. An oscilloscope would show you the actual tops and shoae and you could then calculate the real RMS - if you are so inclined.
Cheers,
Joe

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