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  1. #1
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    623

    trane intellipak vfd

    the vfd had a fault that said earth fault. to me it would mean it sensed a ground fault ohmed the blower motor and traced all the power cables leaving the drive going to the motor. I did not meg the motor maybe the insulation is breaking down. I didn't find anything bad so I restart unit and it operated fine. I restarted unit 2 times just to see if it will reoccur. I called one of the top dogs in the company and told them he said this unit has a history with that same fault so now im curious to know what causes it and what are some things to check for?? im sure I wont be going back another tech would but for future reference I would like to know..... it was the tr1 series trane vfd I was told its the same as a danfoss.

  2. #2
    Join Date
    Dec 2001
    Location
    Phoenix, Az
    Posts
    1,247
    Meg your motor, check wiring for weak insulation. Could also be coming from ground issues outside of the unit. Last resort would be to disable the alarm but not recommended.

  3. #3
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    I had a drive a little while ago that took a bath in water then started hoeing a ground fault. Did everything you just did then replaced the drive, and it's all good now. Did you not have a megger on you?

  4. #4
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,378
    Meg your motors and fully checkout your connections. There was a batch of tr1 drives that had a faulty set of ribbon cables in it that caused this issue. I don't have my brain with me right now (computer) but when I do I can look it up. Can you get the serial number and/or the date of manufacture?

  5. #5
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    623
    Quote Originally Posted by jayguy View Post
    Meg your motors and fully checkout your connections. There was a batch of tr1 drives that had a faulty set of ribbon cables in it that caused this issue. I don't have my brain with me right now (computer) but when I do I can look it up. Can you get the serial number and/or the date of manufacture?
    I spoke with another guy and he did tell me one time he replaced the ribbon cable for the same model about 10 months ago it was giving the same fault ever since then its still running but I thought maybe he was throwing something at me. that could be the problem. nameplate on the drive trane m#tr16016gt4cn1strodlf00aooco S#033032h117

  6. #6
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    623
    Quote Originally Posted by jayguy View Post
    Meg your motors and fully checkout your connections. There was a batch of tr1 drives that had a faulty set of ribbon cables in it that caused this issue. I don't have my brain with me right now (computer) but when I do I can look it up. Can you get the serial number and/or the date of manufacture?
    just curious what type of megger do you use? people mention the supco but id rather buy a quality tool once and know I can trust what its saying especially if im condemming a large motor!!!

  7. #7
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,378
    Quote Originally Posted by anthonyac1 View Post
    just curious what type of megger do you use? people mention the supco but id rather buy a quality tool once and know I can trust what its saying especially if im condemming a large motor!!!
    Don't buy the supco toys! I personally love my amprobe amb1. Fluke makes 1 that is better but costs about double.

  8. #8
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    623
    Quote Originally Posted by jayguy View Post
    Don't buy the supco toys! I personally love my amprobe amb1. Fluke makes 1 that is better but costs about double.
    what model fluke are you referring too? I see there are a couple of fluke meters that are multimeters with the megger function built in. I know I was looking at two different models one was about 450.oo the other was like 600.00 is something like that any good?

  9. #9
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,378
    I am not a fan of the 'megger in a meter' idea, but I also admit that I have never used one before either. The amprobe one I got at Graingers was about 500 if I remember correctly. If you want to really get into megging, then you want one that at least has a timer feature and not all of the flukes have that feature. I meg motors and compressors using the 1 minute/10 minute method whose name escapes me at the moment.

  10. #10
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,378
    Scratch that...AMB45 is the model and it is 650 bucks at Graingers.

  11. #11
    Quote Originally Posted by anthonyac1 View Post
    the vfd had a fault that said earth fault. to me it would mean it sensed a ground fault ohmed the blower motor and traced all the power cables leaving the drive going to the motor. I did not meg the motor maybe the insulation is breaking down. I didn't find anything bad so I restart unit and it operated fine. I restarted unit 2 times just to see if it will reoccur. I called one of the top dogs in the company and told them he said this unit has a history with that same fault so now im curious to know what causes it and what are some things to check for?? im sure I wont be going back another tech would but for future reference I would like to know..... it was the tr1 series trane vfd I was told its the same as a danfoss.
    Possibly Could Be Excessive Moisture Getting In PeCkerhead Of Your Motor,Verify Your Airflow,And Temperatures Maybe seal The Peckerhead Cover, Have Seen Moisture Cause This Problem Many times

  12. #12
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,378
    Quote Originally Posted by anthonyac1 View Post
    ...m#tr16016gt4cn1strodlf00aooco S#033032h117
    date of manufacture code is after the 'H'...11th week, 2007. the affected ribbon cable date codes were 46th week, 2006 (467) to 20th week, 2007 (207)

    you will need Danfoss part number: 175Z1821, 2 per drive. you should be able to go through trane to get them. reference TR1-SVA01-EN

    obviously, please check for a grounded motor or motor wires first as new ribbon cables will not fix that.
    "Mother" is the name for God on the lips and hearts of children....The Crow

  13. #13
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    Fluke 87 V is a great meter and has a meg ohm function however it is not a true Megger or equal to Biddle/Megger
    Attached Images Attached Images
    But I am still learning and looking for a new mentor.
    _______________________
    In a strict sense troubleshooting is not part of the repair..........understand the symptoms and you will find a solution.

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