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We have a dielectric welder model HFT-10 made by High Frequency Technology Inc.They are no longer in the dielectric business so they can't help me. The problem is when you cycle the machine it operates normally until it is time for the RF to fire.When it does it blows the main breaker at the power source.I have changed the breaker to insure that not being bad but to no avail. The other problem is I do not have any kind of book or even electrical schematic so I don't know were to start.I don't know what is suppose to have continuity and what isn't.Can some one help?

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This is a pretty complicated machine and you will need professional help to diagnose the problem There is an electronic tube (similar to the old vacuum tube technology of the '50's) that generates the high frequency necessary to weld with. I found a company that makes high freq. welders and you may be able to go through them.
You may be able to find a Radio Technician that would understand the principals involved in the high frequency generator and how to troubleshoot it. It may only be a problem on the low voltage (240VAC) side of the welder that is causing your problem. A good electrical technician/electrician could troubleshoot most of it. here is a link...
http://www.made-in-china.com/showroom/steveliury/product-detailNqunwEHvfgcy/China-High-Frequency-Welding-Machine-NAR3000-.html

Posted on Jul 31, 2009

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