On Tue, 2011-03-08 at 18:52 -0800, Clint Washburn wrote: > Are there any VFD's you recommend that would support such a motor? > > -----Original Message----- > From: Kirk Wallace [mailto:kwall...@wallacecompany.com] > Sent: Tuesday, March 08, 2011 12:00 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Single Phase Lathe spindle motor question > > On Mon, 2011-03-07 at 22:03 -0800, Clint Washburn wrote: > > I am in the process of converting my 1978 Hitachi Seiki CNC lathe to EMC. > > It currently has a 7.5 KW dc motor that used to be powered by FUJI SCR ... snip
It might be hard to find a VFD rated higher than a few HP that can run on 240VAC input. http://www.automationdirect.com/adc/Overview/Catalog/Drives/GS2_%28115_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control%29 Short URL: http://alturl.com/qhdpo The higher HP drives seem to need 460VAC. I bought a VFD from eBay and forgot to check the input voltage. It turned out to be a 460VAC unit. I have a left over 240 to 120 transformer that I now have 240 feeding the 120 end, and get 480 out the other. The VFD works fine on this, but the transformer is quite a bit bigger and heavier than the VFD. My guess is that if you scan eBay for a 10 HP VFD that you will only find units that need 460VAC. A transformer could fix this, but it would need to be big and probably expensive. 10 HP would need around 35Amps at 240 so keep this in mind too. I suppose a 40Amp dryer outlet would work. You will most likely need a mains filter too. I kind of like Jon's idea of trying to keep the DC motor. I was thinking a golf cart driver might work, but I think the output voltage will be too low. Maybe an EV controller? http://www.evsource.com/tls_controllers.php These seem too expensive though. Maybe AC is the way to go. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
