On Monday 21 April 2008, [EMAIL PROTECTED] wrote: >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 > Very good advice Ray. I ground all my shielding at the controller only. Everything is third pin grounded at the wall plugs, and I've seen no evidence of miss-behavior.
grounding of shielding etc should always be done in star fashion, one common center point only. No ground loops that way. >--- [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. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) How about some patent on "(a+b)^2 == a^2 + 2ab + b^2"? Choose free software! -- Laurent Szyster ------------------------------------------------------------------------- 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
