On Tue, 4 Aug 2020 at 14:03, Matthew Herd <herd.m...@gmail.com> wrote:

> I am guessing that the source of the trouble is probably the VFD, as 80kHz 
> seems like a plausible base frequency for driving an AC motor.

Add an input filter to the VFD. They are not expensive. Look on eBay
for "Rasmi" (one manufacturer, but a good search term)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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