On Thu, 2008-12-18 at 06:26 +0000, Tom wrote: > Kirk Wallace <kwall...@...> writes: > > > > > If you are using a VFD on your spindle (or coolant pump), having one a > > filter on the power input solved my noise problems. > > > > http://www.eastek-intl.com/images/PreoSeriesEB.pdf > > http://www.wallacecompany.com/cnc_lathe/HNC/00024-1a.jpg > > > > If not, using a filter or ferite beads for other power lines might help. > > ---------- > > I checked your photo link. That was helpful. I think I will get a few EMI > filters for the Opto boards and signal power supplies. > > Thanks Kirk! > Tom
Please don't spend your money just because of my comment, just keep it in mind if problems come about. Because VFD's use higher frequency switching, at decent currents, they can create noise on the mains input or other places, but before you spend money, get a second opinion from others on this list, who may have better advise. Another experience I learned from was, with the original motor lead filters on my Hardinge lathe, when I added the VFD, the filters overheated, melted and smoked. Apparently, they tried to do their job of filtering out high frequencies, which VFD's normally put out allot of. The ferrite beads didn't seem have that problem. But I learned this from trial and error rather than informed design, which is not the best way to do things connected with high voltages, currents, mass, dollars, etc. ------------- Kirk http://www.wallacecompany.com/machine_shop/ ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
