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  1. #1
    Join Date
    Apr 2008
    Location
    montgomery, AL
    Posts
    12

    single phase current

    working on chiller 30HXA126RZ-600BA circuit b throwing out alarm single phase current checked voltage ok also took contactors apart no abnormal wear checked connections on CT's and at CPM ok checked amp draw while running once alarm is reset circuit may trip in 2 hrs to 5 days looking thru book found no information on trouble shooting CT's or CPM's ohmed out CT's any way showes closed no resistance but so does circuit A which has no problems.

    Thanks for any help in advance

  2. #2
    Join Date
    Dec 2002
    Location
    Philly Area
    Posts
    133
    Did you confirm your incoming voltage is stable? That usually causes this issues. Physically check your torroids to make sure they are completely connected, no loose ends? Depending on which torroids (CT's) you have the resistance should either measure between 65 and 70 ohms (part # 30 GX502786) or between 38 and 42 ohms (part # 30GX504711). Finally you might want to dry run your starters to make sure all contacts are closing and none of them are pitted? No resistance across them? Can you give us the serial number so we know what vintage machine you have?

  3. #3
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,720
    Are you sure you didn`t have .6 ohms between the CT`s ? What is your voltage imbalance ? And what is your current imbalance ?
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  4. #4
    Join Date
    Apr 2008
    Location
    montgomery, AL
    Posts
    12
    serial # 1398F33837 incoming voltage L1 460 L2 462 L3 461 checked 4 different times throught out day. Have rebuilt all contactors in this machine 6 months ago due to pitting amp draw while running L1 53 L2 54 L3 51

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