Controller build for Plasma

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21 Aug 2020 22:56 - 21 Aug 2020 22:58 #178967 by xnaron
Replied by xnaron on topic Controller build for Plasma
It's snug. 2 x thcad-5s stacked. 24V supply on the inside of the door. Time to start wiring it up.










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Last edit: 21 Aug 2020 22:58 by xnaron.

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22 Aug 2020 01:26 #178973 by dvn4life1972
Have you considered using the SSR's on the 7i96 board? I ask because I see it's neat but packed, and you have what looks like a 4 relay board there.

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22 Aug 2020 01:36 #178974 by xnaron
Replied by xnaron on topic Controller build for Plasma
Yes I plan on using the ssr's. If I run out of room and need more terminal blocks I will ditch the relays

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22 Aug 2020 04:43 #178975 by rodw
Replied by rodw on topic Controller build for Plasma
I personally would ditch the relays now becasue you are currently adding one more failure point that does not need to be there.

This is a Mesa card you are using not some emasculated BOB in Windows.
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22 Aug 2020 14:23 #178997 by xnaron
Replied by xnaron on topic Controller build for Plasma

@RodW I know we had talked about the 25K 5Watt resistor needed for the ohmic thcad-5 setup. Does it replace the 300K resistor below?

No Its in addition to it on the high voltage side as a pull down or pullup. I'll check it out when I get a chance and advise.


Thanks. My eyes read the diagram wrong on the plasma primer. It is 390K not 300K

I am wiring up my controller this weekend.

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22 Aug 2020 14:26 #178998 by xnaron
Replied by xnaron on topic Controller build for Plasma


I am using a THCAD-5 for my Torch Voltage. I would like to keep the Powermax 65 set to 50:1

Do you know what my THCAD divider setting should be?
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22 Aug 2020 15:28 - 22 Aug 2020 16:58 #179004 by snowgoer540

@RodW I know we had talked about the 25K 5Watt resistor needed for the ohmic thcad-5 setup. Does it replace the 300K resistor below?


I updated the diagram to include the 24K 5W resister Rod, myself, and a few others have added to make the deal less sensitive to water tables:



You should also use Rod's Ohmic3.comp which I've attached as well (remove the .txt from the file name). To use it you'll have to use Halcompile and install it. Also, you Have to point your <machine>_connections.hal file to it (change ohmic in Rod's Spaceship example to ohmic3). Not certain how familiar you are or what you are running, but if you are using a buildbot version of LinuxCNC, you'll have to install the dev stuffs first:
sudo apt-get install linuxcnc-uspace-dev

Then to install ohmic3.comp (Note that you have to point the terminal to the directory where ohmic3.comp is located before running the command).
sudo halcompile --install ohmic3.comp

Also, it's worth noting that the example on the plasma primer Rod discusses hooking the thcad up to the IDX encoder. You can use Encoder B if you'd like. I think Rod blew his out accidentally :lol: Also, make sure you are up to date with the latest version of PlasmaC.
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Last edit: 22 Aug 2020 16:58 by snowgoer540.
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22 Aug 2020 15:29 - 22 Aug 2020 15:29 #179005 by snowgoer540

Do you know what my THCAD divider setting should be?


F/32 is what is recommended, unless you are using a parallel port (which I dont think you are).
Last edit: 22 Aug 2020 15:29 by snowgoer540.
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22 Aug 2020 16:21 #179010 by xnaron
Replied by xnaron on topic Controller build for Plasma
Excellent! Thank you @snowgoer540.

So 1/32 for the ohmic thcad-5 setting. Is it the same for the THCAD-5 that is connected to the 50:1 on the hypertherm?
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22 Aug 2020 16:46 #179012 by snowgoer540

Excellent! Thank you @snowgoer540.

So 1/32 for the ohmic thcad-5 setting. Is it the same for the THCAD-5 that is connected to the 50:1 on the hypertherm?


You're welcome.

Yep, they're both the same!

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