Connect THCAD 300 to HF plasma?

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23 Feb 2021 07:08 #199796 by Ekholm
Hi! I understand that connection a THCAD directly to the terminals to a plasma with HF start will destroy it. Has anyone done som modification to HF plasma to connect it before the HF section? Thanks! /Andreas

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23 Feb 2021 09:11 #199803 by tommylight
I have 4 or more of the Mesa THCAD 300 connected to HF and HV plasma sources, but for that to work properly there is only 1 or 2 places inside the plasma, namely on the rectifier output or the RC filter board that protects the rectifier from the HV/HF.
Rectifier output is easy to find on tranformer type, not so easy on inverter types.
Also beware that the usuall electric/electronic rules that the clamp cable goes to + and the torch cable goes to - of the rectifier does not apply as there are inductor coils made out of negative wire going to the torch so it will have full 20000 or more volts going to it when pilot arc is active.
Rectifier output is the safest place.
And of course use at your own risk, there is no support for it as clearly stated on the manual.
Use 100 ohm resistors for both leads at the rectifier to prevent having the whole power going through the wires just in case they short to something. They will change a bit the voltage readings but not by much and it will no affect the cutting and usability.

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23 Feb 2021 12:20 #199817 by Ekholm
Do you any picture of a modification done to a inverterstyle CUT40 (Parkside) plasma? I would realy apressiate that, and i take full responsibilty to my own actions *wink*

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23 Feb 2021 16:25 #199846 by tommylight
I can take pictures of two transformer type i have here, no inverter type here, the nearest is 110KM far.
I do have a Hypertherm Max 43 that is inverter type but has no torch so not helpful at all.
Never done those Cut thingies, but if you can take some pictures of the innards i might help figuring out the wiring points.

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24 Feb 2021 11:53 #199963 by rodw

Do you any picture of a modification done to a inverterstyle CUT40 (Parkside) plasma? I would realy apressiate that, and i take full responsibilty to my own actions *wink*


My thought is that eventually you will need to replace your CUT40 so you might as well do it now :)

PS: if you need help letting the magic smoke out, I am good at that :)

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