Re: [CAD_CAM_EDM_DRO] Re: Power Supply Circuit

mariss92705 wrote:

>
> What it does is sense the 120Hz cap charge restoring current pulses.
> If these are absent, such as when the AC power is shut off or if the
> cap is being backdriven by a drive, a power MOSFET crowbars a wire-
> wound power resistor across the supply. The resistor is sized so that
> it draws the full current rating of the supply thru it.

This might make it impossible to ride through even small power dips.
I had a power outage one night while running my servo-controlled
milling machine. It was dark long enough that I started reaching for
where I had a flashlight stored. The lights came back on, and the
machine was still cutting metal. The spindle VFD, servo drives, and
computer all rode through the interruption, which had to be a large
portion of a second in length. I'd hate to give up that capability.

Jon