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Re: Lost temp control on foot pedal & thumb control
If you have both a foot pedal and a thumb control and neither is working, the problem could be in the 14 pin remote connector on the welder. The pins inside the connector can get worn out and/or broken with regular changing of the remote.
You could also have a bad PC2 board, the front panel control comes after the interface to the remote control.
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The flow of the gas will be initiated and terminated by the use of the pedal, but it does not change the flow rate, just on and off. You will adjust your desired flow rate at your flow meter or regulator. I prefer a flow meter as I find them to be more accurate and easier to use.
The foot pedal will initiate and terminate the arc when used on a HF start tig welder. It works like a gas pedal. For example, if you have your machine set to 100 amps, by pushing all the way down on your foot pedal you'll get 100 amps. Some guys will set their machine wide open and just control the amperage with the foot pedal. I don't do it like that, although there is nothing wrong with doing it that way. I like to have a bit more sensitive amperage control. I will set my machine a little higher than I think I need and feather the foot pedal from there. This allows me to start at a low amperage and also taper off a bit smoother at the end.
The normal set up on the 250 syncrowave will allow you to control your pre and post flow of gas. If the post flow is set up to more than 2 seconds that's the problem. If it is set on zero, then you have a leaky solenoid valve. Check your owners manual for troubleshooting anf repair.
The foot control has a micro switch in it, this one must be worn out. Take it to your nearest werlder shop (like praxair... www.praxair.com ) and ask for the microswitch by brand and model of your foot control. It's easy to replace. Probably the welder shop must order it, since it's noy pretty common for this switch to go bad, but it happens, specially on old welders.
You need to get a diagram of the connector on the pedal, and check the contacts leads that trigger the power on. If the power on contacts are not opening up when you let up on the pedal then the problem is in the pedal, and you will need to open it up to find the problem. If the pedal is opening and closing as it should the problem is most likely in the welders control board. I just went through a similar problem on my Miller TIG, where the pedal wasn't the problem. If you have a bad board in the welder there are places on the internet that rebuild them, for much less than Lincoln would charge for a replacement. Try the two places listed below for circuit boards if you need them.
Check to see if the remote switch has been set, or if you have broken wire in your pedal lead. You might even want to open the pedal housing and take a look see. I've had more than my fair share that the contacts inside the pedal housing were worn or cooked. Good luck, hope it helps