My lathe has a 3HP motor driven by a 3hp VFD. There is also a Kopp Variator variable speed drive, and a 2-speed gearbox with electromagnetic clutches.
Running at 50Hz it thus has two speeds, 10-500rpm and 80-3000 rpm. The VFD works fine in the lower range, but in the higher speed range, unless the variator is wound down to a low speed, the VFD current reaches 18A and the VFD trips out. I am wondering if the 1968 3hp motor was made of bigger horses than the 2015 3hp VFD. I further wonder if I can change the V/F curve to keep the motor current inside the limits of the VFD. Does that seem reasonable, or will the motor simply run slower, make less back-emf and sink even more current? This might be a link to the manual http://www.lovatoelectric.com/HandlerDoc.ashx?s=I365GB12_12.pdf&ic=119 -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
