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Thread: Is this motor correct
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13th Apr 2017, 11:24 PM #1Most Valued Member
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Is this motor correct
Could some one please confirm that this motor is right to run with a vfd.
Thanks
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14th Apr 2017, 03:15 AM #2
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....
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14th Apr 2017, 06:14 AM #3Most Valued Member
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14th Apr 2017, 09:36 PM #4
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14th Apr 2017, 10:15 PM #5Member: Blue and white apron brigade
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With that large a VFD make sure you program the max current to suit the motor or it could damage the motor.
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15th Apr 2017, 12:12 AM #6Most Valued Member
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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.
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15th Apr 2017, 09:39 AM #7Member: Blue and white apron brigade
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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?
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.
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15th Apr 2017, 10:13 AM #8Most Valued Member
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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.
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15th Apr 2017, 12:40 PM #9
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....
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15th Apr 2017, 01:44 PM #10Most Valued Member
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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
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15th Apr 2017, 07:49 PM #11Senior Member
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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.
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15th Apr 2017, 08:37 PM #12Most Valued Member
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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
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15th Apr 2017, 09:54 PM #13Senior Member
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Azz,
I have the VLT6000 manuals in hard copy (original).
Andrew.
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16th Apr 2017, 02:27 AM #14
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....
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16th Apr 2017, 03:49 AM #15Most Valued Member
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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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