Setting up THCAD-5 with 7i96
- razplaz
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FWIW, I also have a THCAD-10 that I'm also having the same issue with i.e. after entering my THCAD-10 frequencies into the calculator and then changing my config settings to reflect the newly calculated numbers, my torch at idle is reading about double what the THCAD 5 is. In either case, if I drop the "arc ok" parameter to above the idle reading then I get an "arc ok" signal. I'm lost as to what I'm doing wrong?? Thanks for any help.
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- AgentWD40
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Here are the formulas used in that calculator:
scale = thcad_model_voltage * frequency_divider * plasma_divider_ratio / (max_voltage_frequency - zero_voltage_frequency)
offset = zero_voltage_frequency / frequency_divider
So simply dividing the scale value by 2 should have been sufficient.
If someone doesn't spot an obvious error you've made you could always disconnect the plasma and attach a LV DC power supply and verify readings/calibration against a multimeter...
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- phillc54
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Have you tried manual calculations as shown in the user guide:
Scale calculation:
Divider_Ratio / ((THCAD_Full_Scale_Frequency - THCAD_0V_Frequency) / THCAD_Frequency_Divider / THCAD_Full_Scale_Voltage)
Offset calculation:
THCAD_0V_Frequency / THCAD_Frequency_Divider
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- razplaz
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0v = 137.3
5v = 966.8
I'm entering scale of .0096 and offset of 4290.625 in the config after running the calc for THCAD-10 and then dividing the given scale (0.01929803) by 2 to reflect the THCAD-5...hoping I did it right...my math is a bit shaky so was scared to try it manual yet lol
If I try the offset manually I get
137.3 / 32 = 4.290625
If I put that in config panel, that bumps my readout value down to 42V...if I pulse the torch my readout goes to +/- 200v.
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- phillc54
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Scale should be 0.00964436
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- razplaz
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- razplaz
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If someone doesn't spot an obvious error you've made you could always disconnect the plasma and attach a LV DC power supply and verify readings/calibration against a multimeter...
So if I understand correctly you're suggesting to hook up a known voltage such as from my 24v power supply, in place of where the voltage divider is located, then I can adjust the scale to reflect the 24v on the readout?
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- phillc54
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What if you try -4290.625
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- razplaz
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- AgentWD40
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Just for my own edification what's going on here? I wouldn't think either the scale as raz mentioned, or the offset as phill mentioned, should be negative. Since FFS > FZERO then the scale should be positive. And since FZERO > 0 then the offset should be positive.
Does it have to do with hal config settings?
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