Problem with Kemppi Mastertig LT250

  1. IronWeber New Member

    Messages:
    1
    Location:
    Lovech
    Hello,

    I've been digging this forum for few days trying to find solution to my problem, but with no success. So I decided to register and find help.

    On the problem. I a came across Kemppi Mastertig LT250, this is the model that need external power source. As I learnt you can't just plug it and use it. For that reason I bought 200A stick welder to us as a power source and made the connecting cables. When I connect everything the machine starts and run with no problems. The problem is that the machine came with non standard torch. The original plug is removed and some king of plug and socket is in its place. The machine is working fine when it is set on touch and lift, but the high frequency start is not working, which is the problem. When I set the machine to HF and press the trigger the machine starts buzzing, but there is no arc jumping between the electrode and the work piece. If I press the button and the touch the metal piece, the arc starts, but this is basically touch and lift setting, and I need the HF to work properly.

    The guy who gave me the machine, brought it to the official service place in my country. He says that they made the HF by switching to original Kemppi torch and connecting the wires, but he couldn't what they've done exactly.

    The plug for the torch has only two wires going into the machine and this is from the factory, and I thick the are just for the trigger.

    Can any one give me idea of the problem?

    Thank you in advance.
     
  2. Appyasme1

    Appyasme1 Member

    Messages:
    1,389
    Location:
    Lancashire
    Do you have an instruction manual for this machine.If not a good start would be to Google Kemppi LT 250.There you will see a download of the settings you will need to check before you go any futher.
     
  3. Tigman

    Tigman Forum Supporter

    Messages:
    2,779
    Location:
    Watford UK
    Sounds like the spark gap inside machine needs setting
     
    eSCHEn and Richard. like this.
  4. Dutch Welder Member

    Messages:
    238
    Location:
    Oss, The Netherlands
    Or the aftermarket torch connector has a HF leak.
     
  5. Richard.

    Richard. Member

    Messages:
    18,093
    Location:
    Cambridgeshire
    The fact you can hear the buzzing in hf mode is a good thing and suggests it’s working. The two last replies are probably the next two best steps. Find out what the points gap should be and set if necessary also check for hf leakage going to earth via another path rather than your torch. And it’s worth changing the torch to see if that’s causing the leakage. Sometimes they are just weak strikers and that’s just that. I’ve used machines where the tungsten needs to be about 1mm away before it will jump the gap and others will jump from an inch.
     
  6. Dutch Welder Member

    Messages:
    238
    Location:
    Oss, The Netherlands
    The buzzing seems to indicate the HF working indeed.
    If it does not come out of the torch it is going somewhere.
    With the aftermarket torch connector being mentioned that would be my first subject.
     
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