PlasmaC torch starting problem (Solved with help from the famous three)

phillc54 wrote:

islander261 wrote: I may be missing something here. It seems to me that the PlasmaC generated Ark Ok signal should only be true when the plasmac torch on signal is true

Yes, I believe this is correct. PlasmaC will only continue if both are true even though Arc OK is capable of being displayed without a Torch On signal.

@Clive.
Did you try a probe test?
I think you have your Pierce and Cut Heights reversed.
It may be worthwhile checking you gas pressure and setting it toward the lower end of the recommended setting.

Yes and I think it is ok
Did you see the vid I posted in Rods answer re the pilot arc with a button across the relay contacts.
photos.app.goo.gl/CMsrzHHvmNoPguUR9

Did you try to do several consecutive short cuts by hand, see if it miss fires.

rodw wrote:

Clive S wrote: I have noticed that when the button is pressed it stops the air purge briefly

I'm not sure that firing a torch in the air without cutting something proves anything. Its the arc transfer is the issue.

Does this interruption of the air flow happen when the CNC triggers it with a relay? If not, what is different about your switch and the relay?

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OK the switch is wired across the relay contacts so it is doing what the relay should do.
Its hard to see with the relay as it drops out to quick.
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When it probes for the fail cut (ie the second one) I can press the button and hold it for about 1sec then release and the cut will continue.

Sounds like the air is halted to allow the pilot arc to fire when you press the button.

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Yes it does But if we could get the relay to stop on longer it should work

tommylight wrote: Did you try to do several consecutive short cuts by hand, see if it miss fires.

yes. ..I only had the torch in the air to show that it was firing fine.
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Also I hear a relay probably the solenoid inside the plasma click when I press the button and the air slows

Actual cuts, the pilot is working, but to know if the transfer is working, actual cuts have to be made.

tommylight wrote: Actual cuts, the pilot is working, but to know if the transfer is working, actual cuts have to be made.

Do you mean jog the z down to height then press the button and keep it down then jog to do a cut say about 50mm