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
