Hi Kirk One needs to be just a bit careful about grounding these sorts of shielding -- if that is what's going on. I recommend star or single point grounding where only one end of the shielding is connected to the frame. If you bond both ends of power wire shielding you'll see ground loops through the metal of the machine as well as the radiated power signals that you are trying to eliminate.
Rayh --- [EMAIL PROTECTED] wrote: From: Kirk Wallace <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Subject: [Emc-users] VFD Interference Date: Sun, 20 Apr 2008 22:42:31 -0700 I got the spindle VFD working on my Shizuoka and the speed varies quite a bit. This seems to be due to interference coming from the spindle motor leads. The cable has no shielding but there are six wires. One for each phase, and three more that seem to connect together at the motor end, but not to anything else. My guess is these are for shielding and should be connected to ground at the controller end. Has anyone seen this before? I would like to verify this before I ground these wires. I could cut the motor connections apart to verify how they are connected, but the factory did such a nice job, I hate the mess it up if I don't need to. Thanks. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC/EMC CNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending Craftsman AA 109 restoration Shizuoka ST-N/EMC CNC) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
