On Thursday 17 June 2021 01:20:51 Roland Jollivet wrote: > If you have some transformers lying around you could stack the > secondaries to get 440V > They don't need to be step-up, just sum the secondaries. You need to > have them all in phase obviously. > > Then use a small, single phase 440V VFD > Most VFD's under 1Hp accept single or 3ph, but I don't know about > 440V. Maybe 380V > > I don't know if you can use a 110V:24V transformer in reverse, or > whether you'll cook it. Worth a try... > No, it not unless you like fireworks. Applying 127 volts to a 24volt winding will saturate the iron and the inductance will go to nearly zero, allowing huge currents to flow.
> Roland > > > > > On Tue, 15 Jun 2021 at 00:36, Gregg Eshelman via Emc-users < > > emc-users@lists.sourceforge.net> wrote: > > The motor is in a Hardinge UM mill, less than 1 horsepower. It > > cannot be switched to 220V. Any way to get it running off 220 volts, > > three or single phase, without breaking a few banks? > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
