60 Hz motor in 50 Hz, half speed operation with VFD
60 Hz motor in 50 Hz, half speed operation with VFD
(OP)
My client is importing an used, 460 V, 250 HP, 1750 RPM motor from US and intends to use it with a 415 V, 50 Hz supply at half the speed of 875 RPM with a VFD. The VFD will be rated for 125 HP due to cost reasons.
How should he program the motor details in his VFD ? 460 V, 60 Hz or 415 V, 50 Hz ?
How should he set the desired speed in each case ?
How should he program the motor details in his VFD ? 460 V, 60 Hz or 415 V, 50 Hz ?
How should he set the desired speed in each case ?
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *





RE: 60 Hz motor in 50 Hz, half speed operation with VFD
Then, he has to set the maximum allowed frequency to 30hz.
RE: 60 Hz motor in 50 Hz, half speed operation with VFD
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 60 Hz motor in 50 Hz, half speed operation with VFD
If all you want is 875rpm and 125hp, I think the motor is an overly expensive choice for the application.
RE: 60 Hz motor in 50 Hz, half speed operation with VFD
RE: 60 Hz motor in 50 Hz, half speed operation with VFD
The motor is package of vertical turning center, of which the client has many. They are all running at around 125 to 150 RPM at around 60 to 75 HP.
This used machine has an inbuilt gear box outputting 370 RPM at 60 Hz. Hence, the motor speed reduction to half to get around 150 RPM at 50 Hz.
With 50% output reduction due to reduced speed, the client still has a margin of 50 hp to play around.
So, to understand all of you, it doesn't matter which set of data we input (460/60, 415/54, 230/30), right ?
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 60 Hz motor in 50 Hz, half speed operation with VFD
My initial thought was that since you wanted to run a 250hp at 125hp that you wouldn't want to go over 30hz anyways but that may not be true.