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  1. #1
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    Default Is this motor correct

    Could some one please confirm that this motor is right to run with a vfd.
    Thanks






    Sent from my iPhone using Tapatalk

  2. #2
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    Perfectly well! Make sure your VFD has at least 2.2kW (not kVA!) output.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  3. #3
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    Quote Originally Posted by jhovel View Post
    Perfectly well! Make sure your VFD has at least 2.2kW (not kVA!) output.
    Thanks joe . That's great . I'm pretty sure it's a 4.5kw drive.


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  4. #4
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    Default

    Quote Originally Posted by azzrock View Post
    Thanks Joe . That's great . I'm pretty sure it's a 4.5kw drive.
    That's a VERY LARGE vfd drive! How did you find that?
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  5. #5
    BobL is offline Member: Blue and white apron brigade
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    Default

    With that large a VFD make sure you program the max current to suit the motor or it could damage the motor.

  6. #6
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    Default 4.5 kw

    hi bob how are you?
    Joee i think it 4.5kw. i brought it here ages ago in the market place.
    how do you tell the rating?
    i do have a 2.2 kw drive its a danfos. i think 2.2 kw is to close to
    motor rating and i believe i have lots more chance of getting the
    cheap drive to run the motor.

  7. #7
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by azzrock View Post
    hi bob how are you?.
    Good mate, I haven't been posting much lately. Helping my son and family move. they got caught between houses and the contents of my sons shed ended up on our front veranda (some of it is still there). Lots of stuff to fix on their new place and I have been over there near every day in the last 2 weeks.

    Joee i think it 4.5kw. i brought it here ages ago in the market place.
    how do you tell the rating?
    It should say on it.

    i do have a 2.2 kw drive its a danfos. i think 2.2 kw is to close to
    motor rating and i believe i have lots more chance of getting the
    cheap drive to run the motor.
    Those Danfos units are good and I would think about using that one

  8. #8
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    Default motor controlers

    ahh your a good dad mate.
    the reason i didnt reach for the danfos is ive never programmed or used one before. so i though it might make the job more complicated.
    as well as this. the motor is 2.2kw and so is the danfos drive. so not a great match.

    Any way it all went well and the motor ran first go. the only problem was the center hight of the new motor was to low so i had to shim it up about 40 mm.



    Quote Originally Posted by BobL View Post
    Good mate, I haven't been posting much lately. Helping my son and family move. they got caught between houses and the contents of my sons shed ended up on our front veranda (some of it is still there). Lots of stuff to fix on their new place and I have been over there near every day in the last 2 weeks.


    It should say on it.


    Those Danfos units are good and I would think about using that one

  9. #9
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    Default

    I would have thought the Danfoss was a perfect match. Why did you think otherwise?
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  10. #10
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    funny joe. i think this has been talked about a bit here.
    i believe that the drive should be over rated compaired to the motor
    rating by 1/3.
    azz

  11. #11
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    Azz,

    If its a Danfoss VLT 6000, the drive should be de-rated by 30% with the loss of a phase, according to the manual.

    Andrew.

  12. #12
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    hi Andrew. thats a good tip. its not a 6000 its a vlt 2800.
    did you dowm load the manual that you were reading?
    azz

  13. #13
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    Azz,
    I have the VLT6000 manuals in hard copy (original).

    Andrew.

  14. #14
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    I always understood that the derating of VFDs was only for 3-phase INPUT VFDs that were used with a single phase input.... My understanding was that a single phase VFD was rated for 100% of their nominal output.

    However, I had a quick look and found that the 'VLT 2800' is a series of VFDs, starting at 1/3HP output shaft power, not a specific model. Can you confirm if you have a VLT 2822 or a VLT 2822PD? They seem to be the 2.2kW output shaft modes. Only the latter one is suitable for single phase input and does not have to be derated except in high temperature, at high altitudes or in high humidity environments.....
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  15. #15
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    Quote Originally Posted by jhovel View Post
    I always understood that the derating of VFDs was only for 3-phase INPUT VFDs that were used with a single phase input.... My understanding was that a single phase VFD was rated for 100% of their nominal output.

    However, I had a quick look and found that the 'VLT 2800' is a series of VFDs, starting at 1/3HP output shaft power, not a specific model. Can you confirm if you have a VLT 2822 or a VLT 2822PD? They seem to be the 2.2kW output shaft modes. Only the latter one is suitable for single phase input and does not have to be derated except in high temperature, at high altitudes or in high humidity environments.....

    Joe thats interesting. right now i wish i had some facts to backup my belief\comment regarding this.
    I think in general regardless of there type. even three phase in 3 phase out. VFD'sWshould be 1/3 bigger rating than the motor it controls.
    Where i learned this i cant remember. E
    ither at tafe or from a engineer at work. You have sparked my curiosity thou.I have a feeling
    that its not crucial but is widely practaced. Maybee.
    your probably right joe.
    azz


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