Dc servo motor control

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...

             

   

Yes it is a 7i92, I could do that with a male-male adaptor, both have female plugs.

When installing the old esab cable for the -10+10V analogue signal I have noticed 2 things:

1. I Had pins the wrong way around. I had signal ground and the -+10v Incorrect!!

2. On the esab wiring the 0v signal pins and the shield are connected, , this is not what I would have expected, I thought that the shield would have went to ground bar and signal ground would be separate. Is it best to connect the signal ground along with the shield? 

 Tommy told me so

  3mm walls and 8mm floor.

  some wiring done, metal cable ties would be better, tomorrow I will get a few enclosures, one to mount THcad on side of plasma unit and another for mounting Z motor drive and PSU. 

 

Tommy, my next decision, IHS. I had planned to use ohmic so I removed the esab sensor (2 prox sensors on a air cyclinder). But with the problem earlier Im not sure what to do, you advise to setup first without ohmic, what method should I use? Im used to ohmic on my smaller machine. So far I can think of:

1.  Refit the proximity sensor and air piston setup, however sometimes this was troublesome dependant on the geometry of small parts which were already missing  from the cut sheet.

2. Fit a float switch, the magnetic holder is not strong enough and the torch is knocked off before the z axis carriage lifts, however perhaps it is best to modify this as would be reliable.

3. Fit relay ohmic, I could disconnect the ohmic probe from the circuit during cutting with perhaps 2 relays during cutting. Would it be best to use spdt relay with the resting postion pin to ground?

4. Same as 3 but use thcad plate sensing.

What method is most sucessfull for this type of machine? This machine will not be used for less than 5mm sheet, mostly 8-25mm plates