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Where To Start ..?

Discussion in 'Troubleshooting and Repair' started by ThermO, Oct 29, 2017.

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  1. ThermO

    ThermO

    3
    0
    Oct 29, 2017
    I am trying to fix a couple 'quite new still'
    "TW163 Thermocouple Welder's" that just stopped spot welding.
    There are 5 of them, and it seems almost like they are all faulty
    (yes, sent them back for warranty repairs already, but they are goofed again)
    Batteries strong @ 12.7Volts..can't wait the months it takes to get them done again,
    What/where is the issue on these things do you think?
    Caps? (non are exploded/leaking)
    All other components not burnt, or any obvious damage
    Where to start..?

    Exact model can be seen in last pic here:
    http://www.maritimestress.com/thermo_weld_units.html
     
  2. kellys_eye

    kellys_eye

    4,300
    1,158
    Jun 25, 2010
    Only two real areas to look at - the controlling switch (to discharge the capacitors) and the capacitors themselves.

    In my experience (of electric fence energisers), systems that rely on heavy discharge of capacitors to provide a pulse invariably suffer capacitor failure/degradation. Occasionally the switching device goes 'open' (sometime shorted, but not often).

    Short-circuits and open-circuits are relatively easy to diagnose but the simplest way to prove a capacitor fault is just to replace them. Get a replacement and wire it in parallel with the existing capacitor first - it may just restore operation to prove the issue. Then swap out as necessary.

    Pics of the internals would help a lot though.
     
    ThermO likes this.
  3. ThermO

    ThermO

    3
    0
    Oct 29, 2017
    Thanks a ton kellys!!
    I have pics,
    but the driver to upload from my cell to computer is now
    down/missing/corrupted.. I scored the iinternet for the internals, but no luck.
    There's 2 big Caps & 1 smaller one.
     
  4. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    ThermO,
    Please take care those caps are very dangerous !!!:eek:
    Properly discharge them before handling and check with a DVM that they are discharged ,
    don't ever short them !
     
    ThermO likes this.
  5. ThermO

    ThermO

    3
    0
    Oct 29, 2017
    You Bet !!
    And
    Thx!!
     
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