Voltage divider for Mesa THCAD-10?

I am an idiot, I was so caught up in my worry i missed that completely. So sorry for my lack of brain function here haha. This cleared up 99% of my questions. You sir are my hero. Thank you so so very much!

AS RODW SAID, you don't need a voltage divider, you just need to limit the flow from the machine to the THCAD10.

I had a cut 50 running on my system using 1M (5w I think) resistor on each line back to the thcad. www.jaycar.com.au/search?text=1m+1+watt&...e8-9e55-e1bddca5b2c9

I did this inside the case so the shielded pair of wires coming out were good to go.

mal136 wrote: Here is the diagram i've found & am going off of so far:

Is this a proper diagram? if not, Can anyone provide or point me to a reliable diagram to go off of? ( i really dont want to be that guy , but i'm struggling here & this would quickly solve my lack-of-knowledge here)

That's my diagram!

FULL DISCLOSURE: I'm a tinkerer with zero electronic/electrical training. As such I drew that diagram and posted it here on the forum so I could get feedback from the community, not so much to guide others (though I'm happy to help!... if it works). I did use that diagram in my build except I didn't use any fuses (yet) and I used a mechanical relay to switch the hypertherm torch on/off. So far my machine works fine except I'm recently experiencing arkOk issues for which there are competing solutions on these forums, one solution is software based debouncing, the other is hardware based. Life has gotten in the way and I haven't had time to tackle this issue yet.

Haha nice, small world here!. I appreciate you making it & staying on the forum to help noobs like me.

I have most everything figured out so far, going to get it all wired up today & start getting LinuxCNC setup & hopefully do some test cuts tonight. I can't wait.


Thank you again to everyone , greatly appreciate it

Sounds awesome, i am doing the wiring today. i feel way more confident in what i am doing now. Greatly appreciate your feedback!

AgentWD40 wrote: That's my diagram!

I told him you could not be trusted! :evil: :evil:

This diagram pops up a lot. The power supplies bother me a bit. It can't be considered a reference design
1. Stepper motor power supply should be seperate and in the range 48-70 volts depending on drivers used. (doubling volts roughly quadruples torque)
2. The 5V and 24 v power supplies could be DIN rail mount Meanwell MDR which are pretty cheap and nice and compact ( I used caged power supplies way bigger than what was required too).

There is no need to use a mechanical relay for the torch on but polarity needs to be expected or the torch may come on straight away.
ArcOK software debounce of 10 ms minimum is a good idea as some of the relays in the plasma cutter are quite slow switching. Plasmac defaults to 5.

The ArcOK signal needs to have something in hardware to ensure the relay contacts do not oxidise which results in intermittent/failed operation. Traditionally a pulldown resistor is used. A HS10 100 ohm 10W resistor would give 200 mA or so on a 24 V circuit, above the relay 100 mA minimum current. PCW has suggested you could use a capacitor to cause a higher current burst to burn off oxide every time the arcOK relay activates. I use a pulldown resistor.