Dc servo motor control

I will sort out the daisy chain. The z axis drive is now in the power box also (bottom left) I ended up chaning to a parker oem670t drive, it tuned in good, i can still change to sheilded wires for the drive. 

I will try moving the thcad board.

If needed I can remount and use old computer box, however my problem is damage to the components, not interference, before problem occured cutting preformance was fine. Problem occured while arc was starting. Previous to this the ohmic sensor was going crazy. One thing I had done which could possibly have caused problems was I wired ohmic sensor to the ground point on the gantry, not to the table, the lead from the gantry to the table and ground rod end up at the far away end of the table (8m, 4 vaccum bins linked with eath cable and bolts) to where i was cutting.  I was using quite a high peirce height. Perhaps the arc has found a path through the ohmic wire from the torch cap and back to the electronics that way. I have now run the ohmic ground to the table. 



 

Joeymcc wrote:

.... however my problem is damage to the components, not interference,

 

Damage to components is caused by that interference, most probably, so denial and insisting on "it was OK" will not fix it.
Remove ohmic sensing completely, make the machine work properly, then try ohmic if you think you might need it.
And i do mean "remove" not just disable in hal, remove all the wires, power supply, everything.
And you are correct, with plasma, the arc start will mess up things, cutting is ok.

Tommy, I will do what i should have done from the start,

my touchscreen computer would not fit in the old cabinet, so I mounted it on its own where the old control was and tried mounting the mesa equiptment in the power box.

I will fabricate a new control box that my computer will slot into, and mount mesa boards there. I will use the grounding bar also that was in old control box. Luckily i have not cut the encoder cables or the homing sensor cables and still have the analogue signal cable from the old control, so relocation should bot be too bad.

You said at the start to use the old control box! Yes this would have been much easier! I guess esab done this for good reason. I wish I had just got a different computer. However at this stage fabrication of a new box will be the best solution and give me the computer i want. I have completely underestimated the damage that the interference could do, the HF start seems to be the issue, I got away so easy with little 45xp before that I got lazy.

I have a few solid state relays for i/o, would these be ok on the power box din rail with sheilded cable from the mesa?

I also have a 3 switches on the z axis, z-, z+ and collision, all physical switches, what would the best way be to isolate these from the mesa? Or will shielded cable be sufficient?

Ah well, at least I have some more knowledge for diagnostics in the future, and will hopefully end up with a moee reliable machine...

             

   

Is that a Mesa 7i92M ?
if yes, that can be plugged directly into the Mesa 7i76 or 7i77.