Some of them tubes are Carbon fiber composite these days. Makes grounding more fun.
----- Original Message ----- From: "John Dammeyer" <jo...@autoartisans.com> To: "'Enhanced Machine Controller (EMC)'" <emc-users@lists.sourceforge.net> Sent: Sunday, December 20, 2015 4:59 PM Subject: Re: [Emc-users] Grounding Issues > Don't get too carried away with Earth as the most important part of > grounding. After all those big metal tubes that fly through the sky > aren't > connected to ground and they have all sorts of power systems from DC to AC > (if you can afford business class). > > The point is to make sure that the current that leaves from one location > ends up back there since current only flows when there's a complete > circuit. > > > John > > >> -----Original Message----- >> From: TJoseph Powderly [mailto:tjt...@gmail.com] >> Sent: December-20-15 4:17 PM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Grounding Issues >> >> >> if you can get a scope (2 trace) >> and _SEE_ the noise >> from your machine ground to a good ground, >> then you can see when you make a difference. >> >> a good ground can be tested with a megger ( hard to find) >> a good ground can be a copper rod driven 10 ft into good earth >> so find the best you can and look to see if theres a difference. >> >> a scope is a very visual thing, forget the scales for now, the picture >> is more important. >> >> my 2c ( hmm 2b here ) >> tomp tjtr33 >> >> On 12/20/2015 07:20 AM, John Thornton wrote: >> > I have a BP knee mill with an Anilam 1100M CNC kit on it. I've removed >> > all the Anilam controls a while back. I've retained the drives and >> > power >> > supply and added a GS2 VFD for the spindle. I have a 5i25 7i77 setup. >> > From the get go I've had problems with the electronics on this > machine. >> > The VFD is controlled by modbus via the gs2 component. The VFD gets >> > reset to default parameters all the time from noise on the modbus. the >> > 5i25 get sserial errors. The sserial errors are so bad now it won't >> > even >> > move an axis. The spindle works ok. The power supply is a simple bridge >> > rectifier with a huge blue cap and a large power resistor across the > cap. >> > >> > Peter keeps telling me it's a grounding issue so where do I start >> > looking and what do I need to do? >> > >> > Thanks >> > JT >> > >> > > ---------------------------------------------------------------------------- > -- >> > _______________________________________________ >> > Emc-users mailing list >> > Emc-users@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> > ---------------------------------------------------------------------------- > -- >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
