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All my VFD's are tripping on Over-voltage

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    #16
    Originally posted by csc_wyo View Post
    Finally got the trend data from the main substation incoming monitoring relays. Absolutely no incoming voltage spike.

    I'm still at a loss.
    This be a local substation to your plant or a POCO substation some distance away?

    Switching capacitors or some other plant going on/off line with a major load, changing taps at regulators all can cause voltage fluctuations or spikes - that may not show up at a distant substation.
    I live for today, I'm just a day behind.

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