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  1. #1

    Confused York YS Power fault

    Hello: York YS chiller keeps giving me a POWER FAULT on display. Chiller starts runs for 2-3 minutes then i get this power fault code? Chiller has a ssms model 5557l-46a. I have checked wiring between boards and found no problem that i could see. HELP!!!!!!!

  2. #2
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,490
    this problem is usually related to the current transformers. watch your amp draw on the panel to see what it is doing during the start up and up to the 2-3 minutes before the fault occurs.
    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

  3. #3
    t1 548 t2-551 t3-551 amps at start before shut down t1-134 t2-114 t3-134 amps

  4. #4
    Join Date
    Jan 2011
    Posts
    1,212
    From the operation manual:

    “LCSSS - POWER FAULT”The Liquid Cooled Solid State Starter Logic/Trigger
    Board has detected that the compressor motor current in
    one or more phases has decreased to <10% of the FLA
    for a minimum of 1 line cycle. This check is inhibited
    during the first 4 seconds of SYSTEM RUN and until
    the motor current is >25% of the FLA. The chiller will
    automatically restart upon completion of SYSTEM
    COASTDOWN.

    Like, jayguy said, check CTs and associated wiring from CTs to trigger board and BTW tou have a SSS7L-46A (not 555)

  5. #5
    How do i check The CTs ?

  6. #6
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,490
    Quote Originally Posted by SPD View Post
    How do i check The CTs ?
    got an ohm meter? look for loose connections. like KY posted, 1 line cycle is very quick and the panel will not update fast enough for you to see it. if everything seems ok, you may need to call in a heavy hitter.
    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

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