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  1. #1
    Join Date
    Mar 2008
    Location
    Mesa, Az
    Posts
    82
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    Carrier 30GXR393AA640CY Nuisance alarms

    Carrier air cooled screw chiller
    model#30GXR393A640CY
    serial#1502F46668
    Hello all so I've been having some strange alarms on this air cooled machine i just inherited a couple months ago. It has a master and slave unit chilled water barrels piped in series. I get these random T051 T052 T055 alarms. Usually will be no motor current, ground fault trip, or contactor failure they seem to jump around between all the circuits no particular order. I reset the alarm machine runs fine for a week then a different alarm generates on a different circuit. Have gone thru all my connections, settings and motor testing and compressor testing everything checks out. I even swapped torrid current sensor with another circuit to see if it would follow that then everything worked fine. very intermittent. all modules are original inside master and slave unit except for a CCP2 module in slave unit. wondering there are some software updates that are needed or if anyone has experienced something like this. any help is appreciated. cooling wise machine works great except for these nuisance alarms.

  2. #2
    Join Date
    Aug 2018
    Location
    Columbus,Ohio
    Posts
    22
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    Have you checked your contacts on your contractor? Voltage imbalance , phase imbalance?

    Sent from my SM-G955U using Tapatalk

  3. #3
    Join Date
    Mar 2008
    Location
    Mesa, Az
    Posts
    82
    Post Likes
    Thread Starter
    Gorilla that’s my next step. Gonna take apart clean with air pressure and contact cleaner and test phase imbalance. Have heard these are kinda touchy on factory phase imbalance setting I think like 16%. I did find a service bulletin that affects series 4,5,6 machines with the Siemens wye delta starter. Mine is a series 4 but it doesn’t have the Siemens starters. I have the telemecanique wye delta starter. Service bulletin is
    DSB07-0002
    Attached Files Attached Files

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