CVHF Trips
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Thread: CVHF Trips

  1. #1
    Join Date
    Jul 2006
    Location
    Cape Cod
    Posts
    157

    CVHF Trips

    I have 3 CVHF Chillers. I'm having intermitten Main Breaker Trips. Motor Megs fine, Contacts great. It does have a tracer connected to siemens apogee.
    Chiller runs great. It could be at 60% and trip or 80%. It's only on one chiller. Monitered voltage for several weeks looks ok. has anyone heard of oil heater tripping a main? Any ideas. Pondered change out the Breaker too much $$ to throw a try.

  2. #2
    Join Date
    Feb 2007
    Location
    Sugar Land, Texas
    Posts
    80

    Hmm

    Don't know if this has anything to do with it or not. I am finishing up a teardown on a CVHF 910, it had several trips at main breaker. The last time I went in had shut down on a diagnostic, found contacts burnt. Unwired motor and megged put and motor megged fine. Two weeks later customer approved replacement of contacts, we went over to replace. Machine came online and tripped main breaker. Megged motor out again and guess what, bad motor. Don't know if this is a trend but I have never had anything like this happen before. Good luck

  3. #3
    Join Date
    Sep 2004
    Posts
    519
    I have seen breakers trip prematurely when the starter cabinet gets hot.Does the starter panel have fans and are they working? Just a thought .

  4. #4
    Join Date
    Jul 2006
    Location
    Cape Cod
    Posts
    157
    We added fans this winter.

  5. #5
    Join Date
    Dec 2003
    Location
    45th Parallel
    Posts
    954
    Have the breaker tested.

  6. #6
    Join Date
    Jun 2006
    Location
    Midwest
    Posts
    284
    Does the breaker have a shunt trip coil?
    It's All Good!!!

  7. #7
    Join Date
    Oct 2006
    Location
    Central Texas
    Posts
    625
    An oil heater will not trip a main breaker. If your megger results read fine, and your starter contacts are clean, is all electrical tight? Is there any corrosion any where? Are the terminals @ the peckerhead clean & snug? Is the starter unit mounted or remote? Meg the line and load wires DISABLING them from both the main & peckerhead. There could possibly be a short in the conduit somewhere. You said you have 3 chillers, I am assuming that only one of them is having the problem. Like one of the other fellas said you could have breaker issues. Its going to be a process of elimination. Hope this helps.
    Sic Semper Tyrannis.

  8. #8
    Join Date
    Jul 2003
    Location
    Central New Jersey
    Posts
    108

    Breaker trips

    if your current draw is normal, have your breaker tested
    Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world... AE

  9. #9
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,225
    Quote Originally Posted by drivewizard View Post
    Have the breaker tested.
    yup. we had a breaker trip several years ago on a 1280 ton machine...it did have a hole blown through the windings so...ok. rebuilt unit. recommended having the breaker checked out since it did trip. they said they did. maybe, maybe not. ran chiller after overhaul...ran great. shut the chiller down. unit was in post lube cycle...1/4 hp motor at 115 VAC. tripped the circuit breaker. we RE-recommended that they have the breaker checked again. another unit started tripping the breaker...bad shunt. replaced breaker...all ok.

    good luck.
    You either love bacon or you are wrong.

    4 gallons of gas, 2 miles of travel, teaching my daughters how to drive in the high school parking lot...priceless!

  10. #10
    Join Date
    May 2007
    Posts
    141

    Chiller Breaker Problems

    In my opinion, it depends on the design and rating of the breaker, what type of fault and how long it exists that may trip the breaker. Any load, no matter how insignificant may trip a breaker if the magnetic inrush exceeds the rating of the device. I would get a new megger or rent one and test all of the conductors, devices, and the motor. Contact the Breaker manufacture and get their input on how many faults the device can suffer before testing or replacement is recommended. Maybe call on a large electric motor rebuider in the area to see if they might recommend an outfit that can monitor the circuit with equipment that will recognize the fault. Good luck.

  11. #11
    Join Date
    Jul 2006
    Location
    Cape Cod
    Posts
    157
    Quote Originally Posted by jimbob73 View Post
    Does the breaker have a shunt trip coil?
    It has a Digi trip, which was replaced at the time of the 1st trip.

  12. #12
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    1,439
    have some pictures taken with a thermal camera of your switch gear, inside the starter cabinet, and the compressor terminals, during a loaded condition. this will show if poor connections are at fault.

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