Ohmic3 hal file errors
04 Apr 2021 20:54 - 04 Apr 2021 21:05 #204812
by snowgoer540
In this picture, the copper piece is the shield (the nozzle is a different part). The piece of metal you bent is supposed to touch it. For ohmic to work the wire on the retaining cap has to touch the shield. Then the shield touches the workpiece and completes the circuit. When that happens, the THCAD reads 24v, the ohmic3 component then interprets this and provides an ON or OFF signal to tell PlasmaC that it’s found the material.
If anything with the torch is shorted internally, or installed incorrectly, your torch won’t fire and you’ll get an error on the hypertherm. From what I can see, you don’t need anything more than you currently have.
Your issue is likely with the wiring of the encoder or settings in the Hal file.
Replied by snowgoer540 on topic Ohmic3 hal file errors
So here it is, I bent out the metal connector around the black shield so it is not touching the nozzle.
This ok to use ohmic sensing? Sorry, cant get iphone to focus on the torch at that closeup.
In this picture, the copper piece is the shield (the nozzle is a different part). The piece of metal you bent is supposed to touch it. For ohmic to work the wire on the retaining cap has to touch the shield. Then the shield touches the workpiece and completes the circuit. When that happens, the THCAD reads 24v, the ohmic3 component then interprets this and provides an ON or OFF signal to tell PlasmaC that it’s found the material.
If anything with the torch is shorted internally, or installed incorrectly, your torch won’t fire and you’ll get an error on the hypertherm. From what I can see, you don’t need anything more than you currently have.
Your issue is likely with the wiring of the encoder or settings in the Hal file.
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04 Apr 2021 21:19 #204817
by rodw
Replied by rodw on topic Ohmic3 hal file errors
Further on this, Snowgoer and I are on the same page. Just he uses a Hypertherm and I don't so he's more familiar with the consumables 
The Ohmic component emulates a relay with some hysteresis between the on and off thresholds (eg turns on at a high voltage value and off at a lower value).
I think the continuity I mentioned is the important test right now. If there is continuity, the circuit is being closed in the torch tip. If the right consumables are installed, then that should not happen. Dismantle and clean the tip, check for foreign matter that could be shorting it out (Happened to me once in 5 years).
What I don't understand is that there is no encoder frequency with the ohmic tip correctly installed (touching the shield). That should never happen. With a full short, you should see the full scale frequency, at 0 volts, you should see the 0 volt frequency all the time becasue of the THCAD isolation. To me that points to a wiring fault or faulty electronics.
The Ohmic component emulates a relay with some hysteresis between the on and off thresholds (eg turns on at a high voltage value and off at a lower value).
I think the continuity I mentioned is the important test right now. If there is continuity, the circuit is being closed in the torch tip. If the right consumables are installed, then that should not happen. Dismantle and clean the tip, check for foreign matter that could be shorting it out (Happened to me once in 5 years).
What I don't understand is that there is no encoder frequency with the ohmic tip correctly installed (touching the shield). That should never happen. With a full short, you should see the full scale frequency, at 0 volts, you should see the 0 volt frequency all the time becasue of the THCAD isolation. To me that points to a wiring fault or faulty electronics.
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04 Apr 2021 23:09 #204824
by tommylight
Now i am confused as to how you have it set up....
It should not be bent, it should stay in contact with the shield.
Take some pictures of the torch with everything detached.
Replied by tommylight on topic Ohmic3 hal file errors
That IS the thing used for ohmic probing and that wire should go to one of the THCAD's.So here it is, I bent out the metal connector around the black shield so it is not touching the nozzle.
This ok to use ohmic sensing? Sorry, cant get iphone to focus on the torch at that closeup.
Now i am confused as to how you have it set up....
It should not be bent, it should stay in contact with the shield.
Take some pictures of the torch with everything detached.
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04 Apr 2021 23:25 - 04 Apr 2021 23:28 #204826
by bevins
All of that is fixed earlier. I had the divider set to 1, PCW kindly noted that's not right as it would never see it.
Now things are happening but I cant seem to get it to work.I think I have my voltages and scales and stuff done wrong. Look at the picture I am getting 45volts in the thcad or so when touching the metal. Should I set my threshold on that? 44-47? It is set to what rod has I think is 24
Whats up with the 0's in ohmic type motion-type?
Replied by bevins on topic Ohmic3 hal file errors
I think we are going down the wrong rabbit hole here. He said he has no velocity on the .01 encoder. Even at 0v, there should be velocity.
I’d start there. It sure seems like something with the encoder side of the wiring to me.
All of that is fixed earlier. I had the divider set to 1, PCW kindly noted that's not right as it would never see it.
Now things are happening but I cant seem to get it to work.I think I have my voltages and scales and stuff done wrong. Look at the picture I am getting 45volts in the thcad or so when touching the metal. Should I set my threshold on that? 44-47? It is set to what rod has I think is 24
Whats up with the 0's in ohmic type motion-type?
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