THC live voltage 0.0V

CrossFire ® Troubleshooting
41

Do you show voltage in the correct spot in the enclosure?

42

I dont know if I am using the “correct” one but it is pretty short.

43

The only voltage readings I saw were the cables coming out of the plasma and the out of the VIM (159 out of the machine and 2 out of the VIM), is this what you mean?

44

Nope read the thread on down it tells you where on the thc chip to check the voltage

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45

Does the THC module show connected (green in the upper right of firecontrol)?

46

Yes the THC is connected

47

I relooked it and see what you are talking about, I tested as per the flow chart and am reading 4V at the chip vs 2V at the line of the VIM.

I also remade the VIM to enclosure panel cable so that I could locate the VIM away from it.

48

Ok a couple questions. When you make a cut with the THC off does fire control show any voltage? Then are you sure the thc chip is in correctly and seated good? You also said you are using a desktop. Do you have the ground plug on the computer isolated? With laptop you need to either run on a battery or use one of those ground isolating plugs. Is fire control connecting to the THC?

49

What pins are you seeing 4V on? I assume you are rounding off these voltage readings?

50

  1. I do not think it shows any voltage but I cannot say for certain as I haven’t watched for it.

  2. I think the chip is seated but will check again tomorrow.

  3. No the ground plug is not isolated from the computer

  4. Yes it appears that Firecontrol is connecting to the THC (shows it green)

51

I believe it is the A1 and the GND pins. From what I could see it was 4 even

52

I would do a straight line cut and check. Then you may try isolating you computers ground.
Then I would call or email langmuir with the results of your test. You probably have a defective part.

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53

So it would seem that the voltage between A1 and GND is not the same as coming from the VIM. It seems like the flowchart suggest that if the wiring in the second green box in the screenshot check out there is an issue on the MCB.

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image1056×1732 230 KB

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54

So I went back through the flow chart as well as the instructions, the voltage coming out of the VIM is the same as that across A1 and GND.

I retested the voltage coming out of the plasma going to the VIM and it is 105 +/- 2V. I inspected all of the wiring, ensured that everything is connected/seated.

I received the voltage isolator and the ferrite chokes which I applied as well.

I read something online about changing the output from PV to DIV so I tried that and retested. Although the end result was the same I did see that during the testing there was some line voltage although I could not actually read it because the background is blurred out during the test.

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55

i would say your best bet is to contact langmuir with all you test results i am sure something is defective.

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56

Any resolution? I’m here because I’m having the same issue.

57

@MattGlandorf has it ever worked?

What plasma do you have ? how is it hooked to the VIM ( voltage input module,; the small black box) and how is the VIM hooked to the Langmuir Electronics enclosure?

58

No it has not been resolved. I tried everything suggested and its possible that I have a defective part but I have been too busy to deal with it.

59

Thank you, Actually I found my issue, my VIM was wired wrong, I had it way wrong, haha. I have the Hynade 60DN I wasnt using the un-divided voltage out, and it seems my pins were wrong off the back of the machine, so I was able to swap my clamp and torch wires and it started working. I was also waiting on a new control board, as mine had the relay always on, so this weekend I dropped my first F bomb

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60

Did you check your connections with an Ohm meter? I checked my wires VS the clamp or torch on front of the machine, and mine were backwards, I went from 0 to fixed, just by swapping those banana plugs.

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