On Sunday 13 December 2015 05:26:48 Andy Pugh wrote: > > On 13 Dec 2015, at 02:32, Gene Heskett <[email protected]> wrote: > > > > I have managed to source ancient motor controller box, originally > > intended to serve as a bidirectional motor controller serviced by a > > 3 phase circuit. > > How about a different plan? > > Feed the cap bank through a resistor. > Use a (cheap $5) solid state relay to bypass that resistor when > LinuxCNC is turned on. > I had largely discounted that idea because the first cycle surge is likely high enough to fuse a 40 amp Crydom. It trips a 20 amp service breaker instantly when its master switch is closed. That would also be complicated by needing a high side drive for it. And doubled in parts count because its actually two 63 volt supplies in series, both of which would need to be controlled. So I'll do it at the AC line in point just for this supply. Besides, this rusty old box with $400 worth of power contactors was free except for the fuel for my WV Caddy. Its about 30 miles one way to Daves place. Last 4.1 is single lane, part blacktop, part mud, 20 mph back country road. He has a concert venue of sorts, called River Rocks, and has done several charity things that worked well because the headliners were usually The Gratefull Dead. That of course brings in the drugs with the "Deadheads" that follow those scenes.
Local LE usually busts a few for posession. And that spoils the charity aspect. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Some mill pix are at: Genes Web page <http://geneslinuxbox.net:6309/gene/GO704-pix> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
