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  1. #1
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    Part winding Starting



    For the PW starting method, we are normally run 1/2/3 first, then 7/8/9
    But can i reverse it by running 7/8/9 first and then 1/2/3 ??? what any problem ?

    Thanks pro.


    AVICO



  2. #2
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    Re: Part winding Starting

    How power on windings is distributed?
    50%/50% or 70%/30%

  3. #3
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    Re: Part winding Starting

    My question would be, why do you want to change it?
    Brian - Newton Abbot, Devon, UK
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    Re: Part winding Starting

    Quote Originally Posted by RusBuka View Post
    How power on windings is distributed?
    50%/50% or 70%/30%
    Hi, RusBuka. Power rate 70/30%


    Quote Originally Posted by Brian_UK View Post
    My question would be, why do you want to change it?

    Hi Brian_UK. Because sometime after overhauling, stator winding lead terminal mark is missing, so can not reg what (1/2/3 )or (7/8/9). So confusing

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    Re: Part winding Starting

    Assuming that your motor terminals are not swoped around after the overhaul you have to run the winding giving you 30%power output first then 70% 2nd. that is 123 first then 789 second

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    Re: Part winding Starting

    both of them is same PW 1 and PW2 winding in screw compressors ( betzer )and time between them is about 0.5 second
    what is your compressor type?

  7. #7
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    Re: Part winding Starting

    Hi if your not sure which half of winding is bigger,get a multimeter and take ohms reading the bigger half will have lower ohms reading and smaller half of winding will have higher ohms readings .So always bigger half of winding should start first ,because other wise if smaller half starts first it wont have the power to turn and it will eventually burn out.
    Last edited by GHAZ; 24-07-2014 at 10:56 PM. Reason: more info

  8. #8
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    Re: Part winding Starting

    Quote Originally Posted by PRESS View Post
    Assuming that your motor terminals are not swoped around after the overhaul you have to run the winding giving you 30%power output first then 70% 2nd. that is 123 first then 789 second
    Thank you
    But Do you agree with @GHAZ, wrote:

    Quote Originally Posted by GHAZ View Post
    So always bigger half of winding should start first ,because other wise if smaller half starts first it wont have the power to turn and it will eventually burn out.

    Quote Originally Posted by mbc View Post
    both of them is same PW 1 and PW2 winding in screw compressors ( betzer )and time between them is about 0.5 second
    what is your compressor type?
    Yes, that is 50/50 if PW1=PW2. my compressor is Frascold Italia, Screw type, 100Hp

    Quote Originally Posted by GHAZ View Post
    Hi if your not sure which half of winding is bigger,get a multimeter and take ohms reading the bigger half will have lower ohms reading and smaller half of winding will have higher ohms readings .So always bigger half of winding should start first ,because other wise if smaller half starts first it wont have the power to turn and it will eventually burn out.
    Thank you.

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