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Thread: Carrier 30gxr

  1. #1
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    Carrier 30gxr

    Hey i have a carrier 30gxr225f611cl ecologic r-134a screw chiller today i walked up to it today to 4 alarms those were a152 (down due to failure) t055 (compressor b1 failure no current) and t052 and t051 (compresor a1 and a2 off due to current unbalance. I first checked the wireing to the klixon module 3 in total and check them to the mail control board and all connections were good. then i reset the chiller and got compressors a1 and b1 to come on and i check for voltage imbalance and amprage imbalance at the klixon modules and ch power at disconnect all were below 5% devation Any other ideas?

  2. #2
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    Loose connections or you really had some sort of weird power issue with all 3 compressors going flaky.

  3. #3
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    I had this same issue at about 3 weeks ago and i found one of the 0/1 wires going to compressor a1 at the crimp connection was bad and corroding. i had the same issue 3 weks ago same codes. ive check the contactior and check voltage drop across and they were under .03v across the contactors, so i know the contactors are good any other ideas

  4. #4
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    Quote Originally Posted by fordtrucksrule View Post
    I had this same issue at about 3 weeks ago and i found one of the 0/1 wires going to compressor a1 at the crimp connection was bad and corroding. i had the same issue 3 weks ago same codes. ive check the contactior and check voltage drop across and they were under .03v across the contactors, so i know the contactors are good any other ideas
    Not unless someone changed the imbalance setpoint and you haven`t changed out a starter lately, it is wye delta right?

  5. #5
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    yes it is a wye delta starter. as far as i know no one has messed with the parameters.

  6. #6
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    A1 & A2 compressor "unbalance setpoint should be 15% default" it alarms after a continuous 15% or more for 25 minutes.

    B1 "no current" if there is a call for B1 comp and there is no amp draw on all 3 legs for more than 3 seconds it will alarm.

    Are than any other alarms in history log? power fails, phase loss etc.. Thats pretty strange, might be the beggining of a board problem.

    Might check primary connections and voltages to transformers serving Klixon modules (CCP's) and secondary connections and voltages. could also be a transformer problem. It would be more logical if there are not any other alarms in history log. especially because it is with 3 compresors and it is on the amperage side (alarms) with no voltage alarms
    Last edited by emcontrols; 02-16-2011 at 12:46 AM.

  7. #7
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    which is the voltage deviation? could give more details? readings of voltage and amperage

  8. #8
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    The voltages are as flopped 477 479 482 ave is 479 so max devation is 3 volts on l3 and 2 volts on line 1

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    amp?

  10. #10
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    the percentage of voltage imbalance is 0.6%
    where maximum deviation 3volts x 100 = 300/479 = 0.626%

  11. #11
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    The voltage imbalance setting can cause you to have alot of nuisance trips on the 30HX and 30GX chillers . It will not hurt anything to set it up to 22%. If you still have trips set it higher.

  12. #12
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    ok the amp draws are as follows 76.4 78.8 and 81.4

  13. #13
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    the% current imbalance is 3.29 is thenormal, maximum by the plant is 15%, check electrical connections to the module cpm.etc

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