I currently have another thread going on a separate issue. I have been doing cut tests to try and figure out a bevel I am dealing with an now my torch won’t even fire. I was cutting this morning just fine, left for an errand and when I got back to the shop the torch won’t do anything. I am using a Hypertherm machine torch with the plug and play cpc cable from langmuir. I did a test with my hand torch and it fires no problem. I can hear the relay click in the power box. The switch on the torch is on. Air supply is good. Everything is as it was when I left the shop. Any suggestions would be greatly appreciated.
Can you fire the hand torch through fire control?
Edit:
Never mind you have the 45 you would have to do some rewiring.
What about the consumables? Any errors?
Consumables are installed correctly. No errors. No fault lights on the machine. I literally went from cutting fine, shutting the machine and table down, leaving for an hour then coming back to the torch not wanting to fire. I really don’t know what could have possibly changed.
Are you sure you have the correct air pressure? Did you check to see that the breaker for the compressor is on? Or maybe a air valve got turned off by mistake.
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Everything is on compressor wise. Like I said I can unplug the machine torch, plug the hand torch in and fire it no problem. I did just find in the manual where I can do a pressure check on the machine. It displays that there is 67psi at the machine which is odd seeing as that it will fire the hand torch and I know there is more pressure going to the back of the machine based on what my gauges read. I would think it would throw a fault light for low pressure. I didn’t close any valves nor turn the compressor off when I left the shop so I know nothing changed there. Just a very odd issue.
If air pressure is good and consumables are not stuck. It sounds like maybe s bad relay switch. You can confirm with a meter if you are confident you can.
I can fire the machine torch with a jumper on the back of the cpc port on the machine so I know the machine side is fine. I’m assuming its something to do with the cpc cable from langmuir although I disassembled the cable and everything looks fine there. Is there any other way I can test the voltage divider box?
Update: I have tested the cpc cable pins with their corresponding cable jacks and verything is good there. I tested the THC cable with its corresponding cable jack and that is fine as well. I can command the torch on through fire control and the relay seems to be working inside the control box. I’m really at a loss here. Not sure what/how to test next.
You will need to check that with a meter it can click and not make up contact. Do you have and know how to use a volt meter?
Yes very confident with a meter, what/where are you suggesting I check?
Check at the connector for the torch on/off on the front of the electronics enclosure. One probe on the center pin and one on the side of the internal hole.
Should be an open circuit until the command to fire the torch. The command to fire the torch should close the relay and result in a closed circuit(continuity)
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@ds690 I am getting no continuity on that connector with the command to fire on.
Edit: I tested the circuit at the back of the plug that the torch on/off wires lead to (purple & orange wires) and did not get continuity when the command to fire was on either.
Well, there’s your problem. That relay should close and complete the circuit to fire the torch.
The relay could be bad or one of the wires on the back of the connector could have come off.
Make sure the relay is fully seated on the board…
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@ds690 The relay is fully seated. I checked the wires (torch on/off wires) at the back of the plug that is plugged into the circuit board next to the relay and have no continuity. I’m going to assume at this point it is the relay. Even though it clicks something is broken inside I guess. I just need to find out from Langmuir how and where to get a replacement.
Edit: does the THC have anything to do with the torch firing? Could it be something in that circuit?
No. It monitors the voltage when the torch is firing and tries to keep the voltage consistent by raising and lowering the torch; thus, increasing or decreasing the voltage to achieve the voltage measured during the beginning of the cut (first 0.25 inches).
@ChelanJim okay thanks. So it definitely has something to do with either the board or the relay. I guess I will just have to get another one on the way and see if it fixes it. Not sure what other troubleshooting I can do.