Just my luck. :(

  1. ukracer Forum Supporter

    I have a heat press my son was given to see if it could be fixed cheap enough.
    That was mechanically....... It was a bit if a mess as I don't think the cheap Chinese bolts etc could hold up to the not quite perfect design and the forces that was causing.
    Anyway if I can get it working it would be fine for a backup as it's one of the best built cheap Chinese presses I have seen.

    The part I need to test is this. IMG_20201120_210023.jpg

    But it's not metering as I would expect it.

    I seem to be getting OC when I test the 24 to 380 side.
    And I get very little from the 3 to 32 side, other than a flicker on the meter that seems to indicate that side is not OC but certainly not complete continuity.

    That said I don't know how these new fangled relays are supposed to meter out. Lol
     
  2. skotl

    skotl Forum Supporter

    Messages:
    7,371
    Location:
    Edinburgh, UK
    I'm confused - that's what I'd expect, given that the internals are likely to be a mosfet / triac switch.
    Have you tried just applying +12V to the input and see whether the output goes closed-circuit?
     
    Anguz likes this.
  3. Seadog

    Seadog Forum Supporter

    Messages:
    6,970
    Location:
    NE London - UK
    Stick your 3 to 32 volts in and the other two terminals should close. You may find that you won't detect it with just a multimeter. Better to have a power source in series with a lamp.
     
    Hopefuldave likes this.
  4. m_c Member

    Messages:
    568
    Location:
    East Lothian
    You'll need to test it in circuit and under load.
     
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  5. skotl

    skotl Forum Supporter

    Messages:
    7,371
    Location:
    Edinburgh, UK
    Good point re likely needing a load :thumbup:
     
    daleyd likes this.
  6. ukracer Forum Supporter

    Well in that case I have tested it...and it don't work. Lol
    But I guess I had better go and check I have something on the 32 volt side or it won't work.
     
  7. daleyd

    daleyd Member

    Messages:
    7,099
    Location:
    Wrexham, North Wales
    It needs a dc signal on the input side and an ac voltage on the output side as said above.

    You won’t get a meaningful reading on a meter if measuring resistance alone on the output side, unlike a “normal” mechanical relay.
     
    ukracer likes this.
  8. daleyd

    daleyd Member

    Messages:
    7,099
    Location:
    Wrexham, North Wales
    For a load you can stick an incandescent lightbulb in series, doesn’t need to be anything fancy.
    I’ve tested 500a thyristor stacks with a lightbulb, all you need is something to pull a bit of current.
     
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  9. ukracer Forum Supporter

    Yeah I sort of guessed it might be like that. Confirmed by the replies on here...in the meantime I purchased one of eBay. Lol

    Then found it's got a very obscure operating panel that does follow convention. I still don't know how to see how it's reached pressing temperature.
    Anyway thanks guys. Just need to find a manual for the press now. Wish me luck. ;) Oh and I need to find some slides as the balls have all fallen out of the ones fitted. Lol
     
    daleyd likes this.
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