On Wed, 2011-03-09 at 11:12 -0600, Jon Elson wrote: > Kirk Wallace wrote: > > > > 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 > > > > > I am running an 11 KW Toshiba VFD on 240 single-phase, and it is > perfectly happy. A few models have phase loss > detection, and will fault if they don't have all three phases. Most > under 10 Hp don't seem to have that problem. > You do need to derate the drive for single phase, if it is not designed > for it. But, remember, these drives are designed to run inside cabinets > at 40 C, 20/7 for 10 years or so. That is not typical home shop duty, > so the drive gets a big break by not running all the time at full load. > > The higher HP drives seem to need 460VAC. I bought a VFD from eBay and > No, there are drives up to 100 HP for 240 V supply. These will cost a > FORTUNE, even on eBay. The 480 V drives have transistors rated for half > the current and twice the voltage, and they are a lot cheaper. Most > industrial sites with 100 Hp motors have 480 power. The current draw of > a 100 Hp motor on 240 V is about 330 A per line! Yikes, the transistors > must be the size of a brick!
Just think about the heat sink, even in switching mode. ;-) Dave > > > Jon > > ------------------------------------------------------------------------------ > 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 ------------------------------------------------------------------------------ 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
