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Wabco scrapers at work

Discussion in 'Scrapers' started by stepp3360, Jan 6, 2008.

  1. RZucker

    RZucker Senior Member

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    Sounds like several problems to me, need to find out if the weak phase starts at the generator output first, If the stator has a bad phase that can get expensive fast.
    I will try to make some time to give you a call tomorrow and give you some ideas of things to check out.
     
  2. DMiller

    DMiller Senior Member

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    Also wondering if there is not a short or a weak service wire issue going on here.
     
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  3. Arlington Farms

    Arlington Farms Member

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    update im checking at the contact and then comparing to gen out put at generator and in getting same voltage at both places ..... but sometimes i see 230 230 160 ..... and then other times i test i will see like 165 165 165 it will be the same at both places ... im talking to a gentleman that says i need transformers ... any thoughts and does anyone have any ?
     
  4. Arlington Farms

    Arlington Farms Member

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    another update ,,, looks like generator test good when unhooking transformer and testing gen alone bout 300 volts across all 3 phases
     
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  5. DMiller

    DMiller Senior Member

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    Transformer could have a intermittent to ground or a failed winding Tap point. Are still a FEW and not sure if any around you electrical shops that will rewind the old ones. Last dry pack I had my hands on was rebuilt in East St Louis IL, they are long gone.
     
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  6. RZucker

    RZucker Senior Member

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    Talked with the OP this afternoon for awhile and I'm leaning toward a diode failure in the booster rectifier. He says he's not getting any more than 24V DC at the field connections, with a load from an unloaded elevator that should go up to 60, even 80V from the starting surge. He mentioned the rectifier is converted to a diode bridge from the old plate rectifiers, but the bridge is in the old oil tank without cooling oil. Uncooled diodes are no Bueno. Later machines with diodes placed the diodes in the air cleaners for positive cooling. We'll see what he finds next. He's going to use some long leads on the multimeter to check the 3 phase harnesses.
     
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  7. weaknees

    weaknees Well-Known Member

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    This thread has been quiet for a while...
    I am currently building a dam in Central NSW, using two 222G's. It's the first job since buying them, having some teething troubles but have shifted 50,000 ccm so far, 65,000 ccm to go.
     

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  8. weaknees

    weaknees Well-Known Member

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    Uploading woes..
     

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  9. Tones

    Tones Senior Member

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  10. Tones

    Tones Senior Member

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  11. Tones

    Tones Senior Member

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    Last edited: Sep 18, 2021