On Saturday 01 December 2018 19:33:01 a k wrote: > i did try to power servo drive with single phase 240v ac. > single phase 240 v ac that what usually residential area have. > phase to phase 240 v ac, and phase to ground 120 v ac. > it work. > i start think that if i use inverter that will take single phase 240 > ac and convert it to 3 phase may be even better. > servo drive input mark l1 l2 l3 and ground 240 v ac. > > On Sat, Dec 1, 2018 at 7:14 AM andy pugh <[email protected]> wrote: > > On Sat, 1 Dec 2018 at 03:25, a k <[email protected]> wrote: > > > but i plan to power with it my ac servo motor amplifier- that need > > > 3 > > > > phase > > > > > 220 240 v ac. > > > > Are you sure that the servo drive won't work off single phase? The > > first stage of nearly all of them is a rectifier and smoothing caps, > > so single phase works just as well as three-phase. > > I am doing exactly that here, with a 40yo 1 hp motor I put fresh bearings in and a 1.5 hp rated inverter thats said to be a clone, purchasable off ebay for around $90 today. Running it on household 254 v single phase, same as the clothes dryer. Not a really smart inverter, but it has enough tweakability to see to it the nameplate FLA is never exceeded, even at 10 hz out, up to about 150 hz, at which point the inductance of the windings has it down to a very low torque as the coil currents are about 1/4 what they at at 60 hz. So I can go from 35 revs in low gear, to about 700 revs, still in low gear. Due to bronze bearings in the spindle, it won't pull 1200 revs in 3rd, even less in top gear w/o loosening the bearing caps a lot. > > It is quite possible that the servo drive will be so much the wrong > > load for the VFD that it won't work at all.
It might Andy, but it won't gain any magic, make your morning coffee either. Use it like its meant to be used and it will do the job. Rigid tapping will quite a bit slower than on a mill, but thats the weight of a 50lb chuck being hard to reverse quickly. > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 -- 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) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
