Guys im scratching my head on this one.

Rebuilt a xenetech engraver. Have it powered by a 48v torroid psu, going into 3x gecko 251’s. For now, the geckos are wired to a cheap DB25 breakout board. The Svt-3 that can be found on amazon. bob power comes from a 5v regulator on the torroid psu.

Machine powered up just fine. Added the pc tonight. And old IBM thinkcentre.
Once I apply power to the cnc while connected to the pc, the pc loses its mind. i can still move the mouse, but left click no longer works. Click on something and nothing happens. Icons. Drop down menus. Nothing.

Power off the cnc. Pc behaves as it should.

Powered on again and it locks up. Tho this last time it tripped the breaker i have on the ac side of the psu.

Both pc and cnc are on the same power strip.

The only thing i can think of- I have my incoming ac gnd tied to the metal chasis and the gecko drives also ground to the chasis themslves via the heatsink. My guess is this is somehow screwing with the computer?

Ill switch to something better once i get a bit aquinted with the machine, but id like to know what the heck is going on. Can post a schematic tomorrow.


Thanks guys!