THCAD-10 and voltaje divider ratio.

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5 years 2 months ago #218834 by paulsao
THCAD-10 and voltaje divider ratio. was created by paulsao
Hello, I have a thcad-10 and I bought a Chinese plasma that has the following connections for thcad cnc, but apparently the ratio is 1: 1, how can I verify this or calculate so that it works well? I attach the photo of my plasma machine

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5 years 2 months ago #218835 by PCW
Replied by PCW on topic THCAD-10 and voltaje divider ratio.
You would need to add external resistors to extend the range of the
THCAD10 to your desired full scale voltage.

For 200V full scale, an external 1.91M Ohm resistor would be correct

You could also use a 1.91M or a 1M and 909K in series

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5 years 2 months ago #218874 by billykid
Replied by billykid on topic THCAD-10 and voltaje divider ratio.
I had read in a post with thcad10 to use two 1 megohm resistors one on + and one on -. is this correct or two in series on the negative?

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5 years 2 months ago #218890 by tommylight
Replied by tommylight on topic THCAD-10 and voltaje divider ratio.
I would use two, one on each line.

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5 years 2 months ago #218902 by rodw
Replied by rodw on topic THCAD-10 and voltaje divider ratio.
Can you also check the resistance from the arc voltage pins to the electrodes? 
I would expect there will be some resistance so bring the current down to non lethal levels. Usually 100k on both sides.
Any resistance needs to be deducted from the calculated values mentioned here....

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5 years 2 months ago #218932 by paulsao
Replied by paulsao on topic THCAD-10 and voltaje divider ratio.
I need only the calculated resistors or those kindly mentioned by PCW, or I also need to place the 2 resistors of 1M in the inputs of + and - of the THC ?, supposedly the output of the plasma machine is ready to use and I should not expect explosions or smoke :) in my th-cad

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5 years 2 months ago #218978 by billykid
Replied by billykid on topic THCAD-10 and voltaje divider ratio.
As Rod said there should be some resistances on the arc voltage socket. you should measure with a ohmmeter  between pin 1 and ground and between pin 2 and the torch electrode.

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5 years 1 month ago #220265 by paulsao
Replied by paulsao on topic THCAD-10 and voltaje divider ratio.
I finally have the plasma cutter in my hands, I made the respective measurements and I get a resistance of 40k between the cnc output pins and this is 40k.

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5 years 1 month ago #220289 by rodw
Replied by rodw on topic THCAD-10 and voltaje divider ratio.
So assuming you have 40k resistance on both electrodes, you need to count the sum (80k) in the resistance you use for the thcad scaling.

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