Originally Posted by
drxlcarfreak
So I messed with it last night. I tried doing one item at a time to see what had an impact. I tried the EMI filter first and that immediately cleared up the spindle requiring a debounce to not trip the limits. When doing this I did notice that the non shielded output of the VFD wiring ran right between the non-shielded limit switch wiring and servo wiring. So I wrapped all of the limit switches with emi shielding and copper tape, and grounded the partially shielded servo motors. I also replaced the VFD wiring with the 16/4 shielded wire from automation direct in the case and the entire length making sure that both sides of the shield were grounded to the case and the spindle. It looks like I must have grounded a wire on one of the limit switches because it is showing permanently switched, so I need to address that, but I am hopeful that this will lick my issues.
I do have a couple more questions about grounding though. I never grounded my case or the cnc itself. I am not sure the reason, but I am guessing that was what I had read in a couple threads most likely. The closest I had is a pin on the BOB on the CNC chassis and another on a touch plate. The only ground from actual panel ground in the case went directly to the VFD which is in a plastic case so there wasn't a chance for the case to be grounded thorough the VFD. Now that I added the EMI filter with it's metal baseplate I noticed that the chassis does now have continuity to ground. Would it be beneficial to ground both sides of the EMI Filter, the VFD and the earth ground all to one spot, or is this sufficient? The 60v, 12v and 5v DC rail grounds now all seem to be grounded, would I want to add them to a star ground as well, or leave them as is? Would it be beneficial to ground the CNC Chassis to the case, or would this add a potential ground loop issue?