Mesa THCAD-10

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03 Jan 2023 12:42 - 03 Jan 2023 12:50 #260837 by aabtech
Mesa THCAD-10 was created by aabtech
      hi am using herocut cut120x which has a CNC connection arc voltage which has a voltage divider 1:1 ratio and I want to know if you can use THCAD-10 for it without any resistor. Can the THCAD-10 
handle 1:1 ratio voltage divider ?
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Last edit: 03 Jan 2023 12:50 by aabtech.

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03 Jan 2023 14:20 #260844 by tommylight
Replied by tommylight on topic Mesa THCAD-10
No.
You will need 2 of 1Mohm or 1 of 2.2Mohm

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12 Jan 2023 15:46 #261703 by mariusl
Replied by mariusl on topic Mesa THCAD-10
Tommy what wattage should they be?

Regards
Marius


www.bluearccnc.com

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12 Jan 2023 15:51 #261704 by tommylight
Replied by tommylight on topic Mesa THCAD-10
2W to 5W whatever you can get your hands on, just to be on the safe side.
Also, 4 of 470K/1W work, wire 2 in series for each THCAD input.

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12 Jan 2023 15:53 #261705 by mariusl
Replied by mariusl on topic Mesa THCAD-10
Thanks. Just picked up the same problem today with an upgrade form Mach3 to Plasmac.

Regards
Marius


www.bluearccnc.com

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26 Mar 2023 21:15 #267559 by n2fastcars75
Replied by n2fastcars75 on topic Mesa THCAD-10
Well have a question in line with the subject here. I have a chinese Hynade cut60DN plasma like this one with the 1:1 ratio arc voltage stated for the 2 pin connector on the machine. Im having some problems with it. Also using a 7i96s with the thcad-10. I have been following another build and they had stated they had a 2.4m ohm resistor on the - pin to the thcad-10 arc voltage input. So i did the same thing figuring it would work the same way for me as well but its not. I was only getting .112 of a volt at my encoder a input pins on the 7i96s board while cutting with the plasma. So after more testing i found out that im only getting between 110 and 130 volts with my meter hooked to the pins on the back of the machine without any resistor in line at all while cutting .125 steel. So does that mean it isn't 1:1 but maybe 50:1 or something else? I cant get any voltage out of it at all without a arc going for at least 5 or 6 seconds as well. Any ideas if there is a way to tell if i open the case on the plasma to say for sure that's what is going on? Any help would be greatly appreciated!!

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26 Mar 2023 22:03 #267565 by PCW
Replied by PCW on topic Mesa THCAD-10
110 to 130 V when cutting most likely means the output is 1:1
Not being present at Arc start is a bit mysterious

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26 Mar 2023 22:46 #267569 by n2fastcars75
Replied by n2fastcars75 on topic Mesa THCAD-10
So do you think a resistor is needed? I was thinking i would need to be inputting 100 to 200 volts for the thcad-10 to output the 0-10 volts?

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27 Mar 2023 01:18 #267574 by tommylight
Replied by tommylight on topic Mesa THCAD-10

I was only getting .112 of a volt at my encoder a input pins on the 7i96s board while cutting with the plasma.

I was thinking i would need to be inputting 100 to 200 volts for the thcad-10 to output the 0-10 volts?

Sorry for being blunt, but stop, go read the manuals for both cards (not everything, just the 3 to 5 pages) then go back at it.
THCAD does not output "voltage" as you expect it, it outputs frequency that is counted as encoder velocity by Mesa 7i96S.
So, first check the wiring from THCAD to Mesa 7i96S, then check the setting in PlasmaC or QtPlasmaC for scale and offset, and if those are correct you get 0V on screen when the plasma is PF and THCAD is powered.
Do not try to cut before making sure all this is working.
You can use a 1.5V battery on the THCAD input side (disconnected from plasma) it should give roughly 45V on screen.

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27 Mar 2023 21:53 #267630 by n2fastcars75
Replied by n2fastcars75 on topic Mesa THCAD-10
Thank you for pointing me in the right direction. Im using PlasmaC but im thinking i need to go to QtplasmaC. I was getting a -36 reading on the axis gui all the time without any change after firing the torch like .050 from a steel plate for a few seconds. Had a little change when i changed my values in the config tab but always stayed negitive. I looked though the manuals and did notice that the thcad-10 board should have a cr2 yellow and cr5 green led working on the board. Im only getting the one yellow led. Another thing i did see as well is that the 7i96s has jumpers for the encoders on it. Im thinking it needs to be set for single-ended (TTL)? There's a commet about only needing to use a + wire to the encoder? Im using fout+ to encoder+ and fout- to encoder- does this sound right? I also have 65 or so volts coming into the thcad-10 board with the 2.5m ohm resistor on the pin that is connected to the ground lead. Does this sound right? I see others say you need 1m ohm on each pin. I got the 2.5m ohm for a guy doing a build like mine with the same plasma cutter. He had noted that peter from mesa had suggested that size to use. So hadn't done much searching on resistors until now. I know there's more i need to check as well. Going to use the manuals and try my best to quite getting myself more confused reading posts on here! Thanks Again!

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