On Thu, 24 May 2012 10:05:32 -0500 John Thornton <bjt...@gmail.com> wrote:
> I've built several rotary phase converters using plans from the web > but they all seem to stop at adding a few caps to balance the voltage > and the auto start circuit with the potential relay. > > Have you ever peeked into your commercial unit to see what else is > there? > > John I've been tempted but never found a roundtoit. Someday it is going to fail and I'll have to. :-( Dave > > On 5/24/2012 8:41 AM, dave wrote: > > On Thu, 24 May 2012 06:00:23 -0500 > > John Thornton<bjt...@gmail.com> wrote: > > > >> Just to update the results of last nights test run of the cobbled > >> up generator setup. While we had a devil of a time trying to make > >> the diesel motor that we coupled up to the generator stay at 1800 > >> rpm it stayed close enough for me to rapid my Z axis up and down > >> at 295 IPM with the spindle turning 2k for about 5 minutes with no > >> complaints from the Simodrive 611 despite the voltage varying > >> wildly as motor powering the generator surged up and down. > >> > >> So now I have two options as I see it and option B is preferred due > >> to the noise of running a diesel generator. > >> > >> 1) buy a 3 phase generator to run the shop. > >> > >> B) figure out how to make my phase converter put out a proper 3 > >> phase. > >> > >> If anyone has any ideas on option B I'm all ears. I have a small > >> line reactor (rated at 3hp) that I can put on the phase converter > >> output and see what that does. I see claims of true 3 phase power > >> from rotary phase converters when searching for rotary phase > >> converter and cnc so there must be a way cause these claims don't > >> seem to be coming from small time shysters. > >> > > <massive snip> > > > > I built a 5 hp phase converter and it was OK but not perfect. Plans > > came off the net. One leg was maybe 20 v out. Been a long time and I > > really don't recall. When I got the Mazak I wanted something better > > so I sprung for a commercial unit. Ray Henry recommended an outfit > > in Birmingham ( AL that is ). > > I got a 30 hp unit. It is really close in voltage, a couple of volts > > between phases. Inrush current on starting is massive but it has > > never blown the motor starting fuses (125 A). Unfortunately the > > outfit either went broke in the recession or they retired. > > > > Even a diesel gen set is an expensive way to get power unless you > > are simply off the grid. As you said, they are noisy and also > > require maintenance. > > > > If I had to do it again I think I'd give the home-built another > > shot. There ought to be a way to auto-tune the phase under load. :-) > > HTH > > Good luck! > > > > Dave > > > > ------------------------------------------------------------------------------ > > Live Security Virtual Conference > > Exclusive live event will cover all the ways today's security and > > threat landscape has changed and how IT managers can respond. > > Discussions will include endpoint security, mobile security and the > > latest in malware threats. > > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > > _______________________________________________ Emc-users mailing > > list Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. > Discussions will include endpoint security, mobile security and the > latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
