Yes I did! Sorry. https://www.driveswarehouse.com/?gclid=Cj0KCQiAsqLSBRCmARIsAL4Pa9T6TYOzrv9mH_DO_eki29PtK-inTHt_0W3FwgAUKC-Z19-jeWD0krAaAjZxEALw_wcB#&&fb=iv
On Mon, Jan 1, 2018 at 2:48 PM, John Figie <[email protected]> wrote: > Greg, > > I don't see a link. Did you forget to add it? > > John Figie > > On Jan 1, 2018 1:32 PM, "Greg Bernard" <[email protected]> wrote: > > > Check out this place. Good prices on drives and motors. > > > > On Mon, Jan 1, 2018 at 11:46 AM, John Figie <[email protected]> > wrote: > > > > > All, > > > > > > Thanks for your replies. > > > > > > My real question was to see if anyone had used GOHZ or some other cheap > > > drive. I currently run all my machines from a home made rotary phase > > > converter. It works pretty well but does not produce the best 3 phase. > > > Yes I know you can use capacitors to adjust the outputs which I have. > > The > > > rotary converter has been running in my shop for about 15 years. I > have a > > > hydraulic automatic surface grinder that does n't like being run from > the > > > phase converter. The pump motor overheats when run from my rotary > > > converter, I think maybe this is because the motor runs near full load. > > > > > > I know I can use a larger drive and derate it to use on single phase > > power, > > > but that seems like a much more expensive option. Some drives have > > missing > > > phase detection that I could probably trick with some kind of AC > input. I > > > think the concerns for me are that the input diode bridge will see the > > > input current distributed among 4 diodes but instead of 6. Also the > > > conduction angle of the diodes will be longer since all of the input > > > current must be supplied from the single phase rather than overlapping > > > phases. Finally the stress on the DC bus capacitors will be much higher > > due > > > to the higher DC bus ripple. This bus capacitor RMS ripple current > > degrades > > > the capacitors due to internal heating. > > > > > > Now since this is a lathe spindle and I am a hobbyist how often will I > > > really need to load the machine to 5hp? Probably not very often. Also I > > can > > > set the acceleration/deceleration to a conservative value to reduce the > > > peak currents. Additionally I think I could replace my rotary phase > > > converter (which is kind of noisy) with the VFD which will produce a > > > different kind of noise (electrical) but It will be quiet. > > > > > > My motivation for asking about GOHZ is that I just discovered them and > > they > > > have a $294 drive rated for single phase input so I would presume that > > the > > > additional stress was considered in the design. > > > > > > Automation direct does not list any VFDs of 5hp or higher rated for > > > operation from a single phase. > > > > > > Here is what I have found so far listed on a spreadsheet. > > > https://docs.google.com/spreadsheets/d/1YS- > > QKbJIlBYDSPdWAelA6ZF0zbS30HrHn > > > qE02-opSRI/edit?usp=sharing > > > > > > If anyone knows of other options please let me know. > > > > > > John Figie > > > > > > On Mon, Jan 1, 2018 at 11:09 AM, Dave Cole <[email protected]> > > > wrote: > > > > > > > I have heard that sometimes you can get around that by putting a > motor > > > > run capacitor between one of the live phases and the unconnected > input > > > > power terminal. > > > > That can sometimes trick the drive into thinking that it has power at > > all > > > > of the terminals. > > > > > > > > Back when VFDs were very expensive the way to do this was with a > static > > > or > > > > rotary phase converter. > > > > I have a 5 hp 3 phase motor on an old turret lathe spindle that I run > > off > > > > a rotary phase converter that I put together a long time ago. It > > > > works. You can find how to instructions on how to build one on the > > > > net. You will need a 3 to 10 hp 3 phase motor as a base device for > > the > > > > converter. > > > > > > > > You can also make a static 3 phase adapter for your existing motor > > simply > > > > by adding some capacitors to "power" the third phase. Info for that > is > > > > also on the net. > > > > > > > > Dave > > > > > > > > > > > > On 1/1/2018 3:46 AM, Nicklas Karlsson wrote: > > > > > > > >> Usually there is a diode rectifier at the input but I guess they > also > > > >> measure voltage and refuse to run then to low so experience is > > > important. > > > >> > > > >> On Sun, 31 Dec 2017 18:45:44 -0600 > > > >> John Figie <[email protected]> wrote: > > > >> > > > >> I have a 5 hp 240V 3 phase induction motor that is for a lathe > > > spindle. I > > > >>> only have single phase 240V power. It seems that most 5 hp vfds do > > not > > > >>> allow single phase input. I found this: > > http://www.gohz.com/5hp-vfd > > > >>> Does anyone have experience with GOHZ or other affordable 5 hp > drives > > > >>> that > > > >>> will run on single phase? > > > >>> > > > >>> John Figie > > > >>> ------------------------------------------------------------ > > > >>> ------------------ > > > >>> Check out the vibrant tech community on one of the world's most > > > >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > >>> _______________________________________________ > > > >>> Emc-users mailing list > > > >>> [email protected] > > > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > > > >>> > > > >> ------------------------------------------------------------ > > > >> ------------------ > > > >> Check out the vibrant tech community on one of the world's most > > > >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > >> _______________________________________________ > > > >> Emc-users mailing list > > > >> [email protected] > > > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > >> > > > > > > > > ------------------------------------------------------------ > > > > ------------------ > > > > Check out the vibrant tech community on one of the world's most > > > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > > _______________________________________________ > > > > Emc-users mailing list > > > > [email protected] > > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > ------------------------------------------------------------ > > > ------------------ > > > Check out the vibrant tech community on one of the world's most > > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > [email protected] > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > > > > -- > > "Anyone who believes exponential growth can go on forever in a finite > world > > is either a madman or an economist." > > -Kenneth Boulding, economist > > Corporations are NOT people and money is NOT speech! > > ------------------------------------------------------------ > > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- "Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist." -Kenneth Boulding, economist Corporations are NOT people and money is NOT speech! ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
