The Dreaded X axis stepper error using UC400ETH and UCCNC !!!

[dachopper]

Hi guys,

My suspicions were correct, the culprit is EMI coming from the spindle, but now that I have replaced all of the cables...... I need some electronically minded advice.

The spindle is leaking current to the entire machine when it is powered somehow.

Inside the 2.2KW inverter, I have the house power connected to R /T on the left for active / neutral, and Ground on the far right.

Then I have the spindle power on U/V/W in the middle.

The shielding on the spindle cable is not connected to anything at the Inverter end, but it overlaps onto the metal plug at the Spindle end - could this be the cause?

The other possible issue is that this spindle does not have an earth - aside from it's power return cable.... If I did run an earth wire attached to the spindle or aluminium Z axis block, can I just plug that into the house power earth inside the inverter box, or could that cause some kind of fault/loop?

The question is, is the charge coming from the shielding getting charged, and because it's touching the outside of the metal plug, it's then charging the machine, or the lack of a spindle frame Earth is now somehow causing the issue