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  1. #1
    Join Date
    Mar 2008
    Location
    Mesa, Az
    Posts
    107
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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
    36
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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
    107
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    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

  4. #4
    Join Date
    Jun 2013
    Posts
    9
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    Hi,
    What software are you using to interface with these machines?
    Thanks,

  5. #5
    Join Date
    Nov 2016
    Location
    London
    Posts
    65
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    If the chiller will run fine for a week- there is nothing wrong with the chiller. The controls are finicky and don't work. The controls are the problem

    Why not rip all the wires out of the panel and fit a simple controller? Over here Carel is a very reliable controller that doesn't trip out all the time. In The States: MCS is popular. Follow this link to read more https://www.maximuschillers.com/chil...hment-rebuild/ The first time I did it it took some guts! I mean: can you imagine going into a panel with a pair of snips and a terminal driver and ripping it all out? Doing that goes against all the instincts of a service engineer. Not all the wiring: the 3 phase, common neutral and the transformer can stay. Just all the annoying, finicky wires that fault out all the time: the sensors, transducers and controller. Once you have done that: you can go back in the morning with a different head on, have a cup of tea and wire it in one wire at a time. The program settings come as default in the new, reliable controller so only the odd one need to be tweaked. Now the machine will run seamlessly with no more stupid silly tripp outs
    Centrifugal, Water Cooled and Air Cooled Chillers. Ammonia Industrial Refrigeration Maximus Chillers Ltd.

  6. #6
    Join Date
    Nov 2011
    Location
    East Side
    Posts
    6,163
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    isn't that just reinventing the wheel?

    what if he does all that, and finds out there is a problem external to the machine causing it?

    "oh, sorry Mr. Customer, I know you just paid me $10,000 to fix your machine, I just missed this one wiring issue, and could have had it fixed in 5 minutes......oh, well, you had to spend that money anyway right?!"

  7. #7
    Join Date
    Nov 2016
    Location
    London
    Posts
    65
    Post Likes
    Your right it could just be a little thing and a new controller a big job. It just reminded me of a job I have done recently where a simpler controller resolved nuisance trips. Let's hope he sorts it
    Centrifugal, Water Cooled and Air Cooled Chillers. Ammonia Industrial Refrigeration Maximus Chillers Ltd.

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