On Sun, 2010-12-05 at 11:35 -0600, Igor Chudov wrote: > Kirk, do you use them on the output of the VFD or the input?
Input only, but this is due to my melting the filters on my HNC. http://www.wallacecompany.com/cnc_lathe/HNC/00024-1a.jpg http://www.wallacecompany.com/cnc_lathe/HNC/ The original spindle motor had relays to control 3-phase forward and reverse. A CVT (constant velocity transmission) was used for speed control. The motor leads had a filter on each phase. When I added the VFD, I had the filters on the motor side. When I ran the motor, the filters smoked and melted. I think the high PWM frequency the VFD uses to create AC causes the filters to overload because they are trying to filter this high frequency out. I now have ferrite beads on the motor leads, but one should be cautious about adding anything to the motor leads and should monitor the heat that might be generated. I noticed no effect by adding the beads, but they seem to do no harm. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ What happens now with your Lotus Notes apps - do you make another costly upgrade, or settle for being marooned without product support? Time to move off Lotus Notes and onto the cloud with Force.com, apps are easier to build, use, and manage than apps on traditional platforms. Sign up for the Lotus Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
