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  1. 17-10-2014 #6
    irving2008's Avatar
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    irving2008
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    All commercial VFD control inputs are referenced to signal ground, which shouldn't be confused with safety earth. The AC input and UVW outputs are isolated/floating.

    The VFD has effectively got a low pass filter on the speed control inputs as it has a limited slew rate on speed. You could add an external capacitor but it's not needed.
    Last edited by irving2008; 17-10-2014 at 08:44 PM.
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