Tim Wescott writes:

Vernon wrote:

Disclaimer:

I'm an EE, I've driven motors every which way, but I've never bought a
VFD, so I know theory but not particulars.

Meetoo..

First:

If you disconnect the mill's on/off switch, put a big red shutoff button
connected to the VFD power out there. Make sure you can reach it when
your tie gets caught in the spindle (you _do_ dress formally when you
use your mill, right?).

Second:

See First: It's the most important aspect.

Depending on the VFD, maybe it has a shutdown function, but don't depend
on it. I'd have a direct 3-phase pushbutton, the latching kind. [Push in,
it stays in until unlatched.] Use an aux contact for the VFD.


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