Z axis

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14 May 2020 01:44 #167694 by phillc54
Replied by phillc54 on topic Z axis
Maybe if you could measure the raw arc voltage and also the input to the thcad at the same time while you were doing a cut we might be able to determine whether the divider ratio is correct.

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14 May 2020 02:00 #167695 by motal2004
Replied by motal2004 on topic Z axis
No,

So I built a whole new configuration from scratch. Instead of using axis I used gmoccapay.
With the my valves plug in it voltage measures from 0 to negative 0 and when I trigger torch it jumps up to 140-143V
So I’m guessing something with my original settings, now I have to play with the scale number so it stops jumping back and forth

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14 May 2020 02:05 #167696 by phillc54
Replied by phillc54 on topic Z axis
That is strange, I couldn't see anything obviously wrong but it wouldn't be the first time I missed something.

Axis or Gmoccapy "should" make no difference, it is the plasmac component that does all those calculations...

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14 May 2020 02:38 - 14 May 2020 02:53 #167698 by motal2004
Replied by motal2004 on topic Z axis
Any idea as why my resting voltage keeps jumping from 0 to -000 ? It’s messing with my ark ok signal
Attachments:
Last edit: 14 May 2020 02:53 by motal2004.

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14 May 2020 03:01 - 14 May 2020 03:02 #167699 by phillc54
Replied by phillc54 on topic Z axis
I am surprised that it affects the Arc OK, can you tune it out with the offset.

Can you post a shot of the Config Panel.
Last edit: 14 May 2020 03:02 by phillc54.

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14 May 2020 07:52 #167709 by rodw
Replied by rodw on topic Z axis
Can you tell me what plasma cutter you are using?
Sometimes the dividers in the plasma cutters divider board are seen as being the scaling resistors by the THCAD10.
For example, the Everlast is out by a factor of 1.5 so a 50:1 divider would be 75:1
Or the Everlast 16:1 which is pretty good for the THCAD-10 but you need to calibrate as a 24:1
Its not actually the dividers fault, just how it interacts with the THCAD.

So if all else fails, use the raw arc voltage and install scaling resistors as shown in the THCAD manual but be sure to deduct the 200k resistance you already have from the required scaling resistance. I tried this onnce and it works perfectly.

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14 May 2020 15:06 - 14 May 2020 17:06 #167750 by motal2004
Replied by motal2004 on topic Z axis
phillc54
- I will post a picture of my config panel this evening. before calling it last night, I did try and tuning out by adjusting the scale up and down, no luck...

side note... when the voltage reading jumps from 000 to -000 the arc on light goes on and off along with ohmic test button coming on and off as well. at this time i don't have that set up, even wired.

rodw
- right now I have the primeweld cut 60 plasma cutter., I provided a link to it below. comparing the everlast manual to the primweld cut 60, they appear to be very similar machines
a couple question,
1-should I mount my THCAD-10 in or on my plasma machine or keep it in my control box?
2- how can I determine what factor my machine is off by.
3- should I rewire my cnc port pigtail to the 16:1 or raw arc voltage ? if you recommend rewiring, i would at this point wire in the arc on connections. should this cable also be shielded?
primeweld.com/products/cut-60-220v-110v-60-amp-plasma-cutter

thanks for everyone help. I can see the finish line is close.
Last edit: 14 May 2020 17:06 by motal2004.

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14 May 2020 19:32 #167777 by rodw
Replied by rodw on topic Z axis
Very similar look.

So a quick look back, you had -74 volts. I assumed you have changed the sign of the encoder scale so its now showing +74 volts.

74 * 1.5 = 109.5 volts. That is pretty much bang on where I would expect where your arc voltage should be.

My cut voltage was way low against what I expected. The way I worked it out was to use 2 x 48 volt power supplies (96 volts) and plug them into the divider board inside the machine. I did post on plasma spider plasmaspider.com/viewtopic.php?f=111&t=23700
And in my spaceship plasma build thread here.

So I would leave your wiring as is, remove any scaling resistors and reset Plasmac for a 75:1 divider. It does not really matter what is shown on the machine. becasue you don't have cut charts for it. So do that and just use auto volt sampling in Plasmac. If you do want to use raw volts, then the resistors in place make the voltage non-lethal so you can just change you wiring around to pick up the raw arc voltage and scale as per the manual for 300v. (including the 200K already there) But I would not bother.
The following user(s) said Thank You: motal2004

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14 May 2020 23:32 #167796 by phillc54
Replied by phillc54 on topic Z axis

motal2004 wrote: - I will post a picture of my config panel this evening. before calling it last night, I did try and tuning out by adjusting the scale up and down, no luck...

When you do that can you post a zip of your complete config.

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15 May 2020 20:39 #167891 by motal2004
Replied by motal2004 on topic Z axis
will do in about 6 hours, from now

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