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Thread: YORK YMC2 VSD - HIGH C PHASE MOTOR BASEPLATE TEMP

  1. #1
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    YORK YMC2 VSD - HIGH C PHASE MOTOR BASEPLATE TEMP

    Help?? I have a YORK YMC2 that trips on VSD - HIGH C PHASE MOTOR BASEPLATE TEMP. Coolant has been replaced, heat exchanger has been cleaned.

  2. #2
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    What the temperature compared to the other phases? Could be a failing sensor.
    Or the the heat transfer plates are very dirty. The is a cleaning solution from JCI that may get you back on line.
    If not may have to pull apart and hand clean the transfer plates.


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  3. #3
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    Thread Starter
    Phase A = 162*
    Phase B = 165*
    Phase C = 190*

  4. #4
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    If the amp draw is equal on all legs looks like it could be dirty.
    Do you know if the coolant has been changed before you and if it was discolored. Should be light blue or clear.


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  5. #5
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    Yes, amp draw and voltage are within reason. Nothing out of the ordinary.

    The entire VSD was previously serviced by JCI. When I initially took over this chiller the coolant was a rusty/brownish color. Since then the VSD “cool” side was flushed with distilled water and refilled accordingly. The color of the coolant is alarming, I could not imagine the coolant being the older inhibitor on a 2 year old machine.

  6. #6
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    Never thought of that, makes sense.

    If amp draw is within reason on all three phases, maybe C phase baseplate is dirty??

  7. #7
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    Distilled water won’t clean it out. The rusty / brown is sign that a proper cleaning needs to be done.
    There is a JCI SI letter on what is needed and how to do it. I can look it up tomorrow.


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  9. #8
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    Quote Originally Posted by Chev5372 View Post
    Distilled water won’t clean it out. The rusty / brown is sign that a proper cleaning needs to be done.
    There is a JCI SI letter on what is needed and how to do it. I can look it up tomorrow.


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    Yes, please do. Thanks,

  10. #9
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    Like Chev said, your best bet is going to be to disassemble the drive and clean the backside of the IGBTs. Is it a 774?

  11. #10
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    Sorry I can’t letter with the part numbers and procedures.
    Hopefully someone will come along and post it.


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  12. #11
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    Don't overlook Chev's suggestion of a failing sensor. We recently had one on an old YS screw's Solid State Starter.
    In honor of RichardL: "Ain't 'None' of us as smart as 'All' of us".

  13. #12
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    See if this works.
    Attached Files Attached Files

  14. #13
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    Quote Originally Posted by Lddc View Post
    See if this works.
    this bulletin is for the older Style "A" Solid State Starters. The OP has as a new style VSD.
    "Right" is not the same as "Wise".

    Don't step on my favorite part of the Constitution just to point out your favorite part.

  15. #14
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    Quote Originally Posted by jayguy View Post
    this bulletin is for the older Style "A" Solid State Starters. The OP has as a new style VSD.
    Yah, I couldn't find it for the newer VSDs. Particularly for the YMC2 but the process to replace e the brown colored coolant should be the same. Just want to show that JCI is aware that it changes color. Could never find an reason why. I do know that it is made with more then 90% water according to the sds sheet.

  16. #15
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    The one I remember was 3-4 pages with color pictures of the solution changing from brown to clear as the process is followed. Had a list of what was needed with part numbers. Was in SI or SB format.

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  19. #17
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    Thank you made my self nutz. Could not find that on the knowledge exchange.


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  20. #18
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    these discussion gives some lights on the importance of cleaning the internal cooling loop of VSD. here Dubai, most tech practice only top up the glycol when the level is diminishing, no effort to inspect the condition of the solution. thanks

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