> On 6 Mar 2015, at 12:56, Russell Brown <[email protected]> wrote:
>
> Any ideas what might cause this?
Almost certainly EMI. An input filter for the VFD can help. Check eBay for
"Rasmi" they are not expensive.
If your mill is not downstream of an RCD then I have one spare you can have.
Otherwise make sure you get one with <3mA leakage current. (This point is why
I have a spare)
Note that these go on the input to the VFD to keep noise out of the mains
wiring.
But the really simple solution is likely to be the HAL "debounce" component.
20mS delay in a limit switch isn't critical.
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