The digital output on the motherboard does not provide a voltage to the relay to trigger the torch.
Using fusion 360 to generate my G code
Using Mach 3 CNC version r3.043.066
Manual torch on and off does not energize a digital output on the main board.
I verified this with the voltmeter
I can short out the lead from the Miller plasma cutter and light the torch.
Main board LSCX0318-1 Ver.1.2a
What do you suggest I might do to resolve this issue
Welcome to the forum! So you have an older Generation 1 version of CrossFire? And, in Fusion 360, you’re using the CrossFire Mach 3 Post Processor?
I suggest using cut and paste the first 50 lines of your GCode file into a post so that we can confirm that the output is correct.
Thank you for your interest in helping me
Note that the Torch On/Off F5 button also fails to power the output.
Here is the 50 lines:
(v1.6-af)
G90 G94
G17
G20
H0
(2D Profile9)
G0 X3.3018 Y0.9431
M3
G4 P0.6
G3 X3.3407 Y0.884 I0.049 J-0.0101 F10.
G3 X3.4337 Y1.3352 I0.0465 J0.2256
G3 X3.3407 Y0.884 I-0.0465 J-0.2256
G3 X3.3998 Y0.9229 I0.0101 J0.049
M5
G0 Z1.
G0 X2.9798 Y-0.0742
M3
G4 P0.6
G3 X2.915 Y-0.1024 I-0.0183 J-0.0465 F10.
G3 X3.3437 Y-0.2708 I0.2144 J-0.0842
G3 X2.915 Y-0.1024 I-0.2144 J0.0842
G3 X2.9433 Y-0.1672 I0.0465 J-0.0183
M5
G0 Z1.
G0 X2.2919 Y-1.1294
M3
G4 P0.6
G3 X2.2214 Y-1.1343 I-0.0328 J-0.0377 F10.
G3 X2.5689 Y-1.4367 I0.1737 J-0.1512
G3 X2.2214 Y-1.1343 I-0.1737 J0.1512
G3 X2.2263 Y-1.2048 I0.0377 J-0.0328
M5
G0 Z1.
G0 X1.2513 Y-1.8381
M3
G4 P0.6
G3 X1.1832 Y-1.8191 I-0.0436 J-0.0245 F10.
G3 X1.4092 Y-2.2204 I0.113 J-0.2007
G3 X1.1832 Y-1.8191 I-0.113 J0.2007
G3 X1.1642 Y-1.8872 I0.0245 J-0.0436
M5
G0 Z1.
G0 X0.05 Y-2.0973
M3
G4 P0.6
Z
P.S. I am assuming that the firmware could be out of date or that the pinout that is assigned to light the torch is not correct. These are my guesses, and I’m hoping that the fix is more software-based than physical. This CNC Plasma Table is several years old but never used! so it shouldn’t be broken.
It certainly looks like that is the Firecontrol post processor, not Mach3.
Can you move the gantry with the Mach3 controls?
Have you ever used this table and had the torch work correctly?
If it has never been used, the most likely issue is that you have it wired incorrectly.
As @ds690 points out, you are using the FireControl post processor, not the Mach 3 Post Processor.
If you KNOW that it is a Mach3 system, then go to this page:
https://www.langmuirsystems.com/downloads/legacy
and follow the instructions there to install drivers and Post Processor for your CAM program.
Couldn’t get fire control to connect. Only Mach 3 worked with moving the gantry and G-Code drives it perfectly The only thing I can’t do is light the torch. To answer your question I have never lit the torch through the table. I can short the plug that plugs into the table and get the torch to light. I’m quite versed in electronics so I troubleshot it to the board. The five volt output that drives the relay that came with the table is not energizing. I worked with 3D printers laser cutters the small ones and such so getting my hands on this table is predicted to be a lot of fun. 
@ds690
“It certainly looks like that is the Firecontrol post processor, not Mach3.”
This is very true I found the post-processor for fusion 360 from the current page and obviously Mach3 is not current. I would love to get firecontrol to work but first things first get the table to work with something.
Your link looks like it could be exactly what I need I will follow it when I get to the shop. Thank you! I will post here here again if I still have troubles. I knew it was going to be simple.
Z
The Mach 3 driver and post processor have not been updated for years.
This won’t happen until you replace the existing Controller board in your system. Firecontrol only works with the custom Langmuir Systems controller board.
The optical driver on the Mach 3 controller board gets it’s 5V supply from the third pin in that line of connections. Gnd on the fourth pin.
This won’t happen until you replace the existing Controller board in your system. Firecontrol only works with the custom Langmuir Systems controller board.
I’m interested in the upgrade Is there a place on the site to acquire this board?
Firecontrol looks great and I bet it will be better overall.
The optical driver on the Mach 3 controller board gets it’s 5V supply from the third pin in that line of connections. Gnd on the fourth pin.
The relay is connected between pin V24 and output 4. V24 has a jumper to 5V on the same main board. I measured the voltage across the V24 to output 4 I read 0V in both states of the Torch On/Off F5 button. The V24 pin to ground reads 5V. I believe the USB cable from the computer drives the main board’s 5V supply, as I do not see any power coming from the 24V supply that drives the stepper motors. I didn’t remove the heat shrink from the relay to see what it was rated at, but I would assume it is 5 volts. I checked the resistance across the relay, and it was somewhere around 500 ohms, I believe… I didn’t document this. With the connector for the relay output 4 disconnected, I checked the voltage on the 24V pin and output 4 didn’t get any response from the pin when I fired the Torch On/Off F5 button. As mentioned above, the driver I installed for the Mach 3 is not the proper driver for this version of the board. I ran out of time to try the suggested fix today, so Monday is my next opportunity. I appreciate all the help.
Z
The relay is 5V and the 5V is supplied from USB as you surmised. IIRC, one side of the relay is connected to 5V and the other side to Out4 which pulls to GROUND when Out 4 is activated. If your Mach3 Configuration file is not correct then the F5/Fire button will not activate Out4. If, for some reason the Out4 Driver is blown, you could rewire to Out3 and change the Mach 3 configuration.
This may require a pin removal tool, however. If you do remove the Out4 wire from the connector, a simple test would be to ground the wire and see if the relay trips.
You would have to contact Langmuir Systems support to see if you could purchase a board. I do not think it’s a normal sales option. FYI, Support operates 5 days a week, business days only. You can get an entire Controller replacement if you purchase the Z Axis upgrade for Gen1 system.
*** Solved ***
The Solution makes opperational the Gen 1 - Mach 3 system with lscx0318-1 ver.1.2a main board.
Thanks to all! especially @ TomWS who directed me to the correct link. The video tutorials helped tremendously. Thanks, Langmuir Tech Support.
The solution:
Thanks for reaching out, we’re happy to help!
Mach3 needs to be installed and set up in a very specific way in order to work with the CrossFire machine. Please follow along with the instructions that are shown in the first video of our Mach3 tutorial series linked below:
https://www.langmuirsystems.com/software/mach3
The Mach3 installer and the necessary supplemental files can be found at the link below: