Arc OK intermitent issues on torch fire

luftlupus wrote:

So this is the relay at the end of the transfer pins but it seems a lot smaller from what i was expecting to find.

If that is the transfer relay then you shouldn't need any contact wetting. The minimum switching current for it is 10uA at 10mV.

Disconnect the wires from the transfer terminals of machine and check with an ohmmeter on the transfer terminals while attempting a cut.

luftlupus wrote:

was cutting great with the new 1 resistor until this afternoon when i can only assume something has let the magic smoke go as when the torch tries to fire now there is no pilot arc or ArkOK signal coming back to the GUI. so maybe i have blown the transfer relay i am thinking.

This is exact behavior I saw with SSR vs Dry Contact relay (what your manual calls for as well) for controlling the torch firing.

Assuming your machine is still misbehaving, it's easy to test, in fact it's the way I discovered the problem by accident: Touch the two "torch on" wires together.

If the pilot arc starts reliably when it was otherwise not working, then that's the problem at least with the "the torch tries to fire now there is no pilot arc" part of the issue.

For my machine, it would reliably fire with touching the wires together. When I hooked it back to the SSR, it would intermittently fire. For reasons I don't understand, when it was wired to the SSR, whether or not the ground clamp was hooked to the table would increase or decrease reliably. After discovering that was the problem, I can take the ground clamp off the machine and it still produces a stout pilot arc.

I think it's worth a try to solve the "torch on" portion of your woes. It's cost free, other than time