3 phase motor

[Northen]

Hi I am looking at importing some machines and the manufacturer fits a CE approved 3 phase motor which is 380v 50hz is this rating ok for our UK 3 phase supply ?

 

[Darkwood]

Where are they from CE means something else if from china, ive got some 380v motors on one of my customers lathes and ive fitted transformers to reduce voltage as all control system etc run on same voltage too, i wouldn't recommend you put on UK 3phase without reducing voltage, also check they are not been sent with transformer as spec' you received is usually for the machine and if sold to other markets with different voltage they sometimes ship the relevent transformer with it.

 

[Northen]

Not sure what you mean by reducing the voltage ? I thought UK 3 phase voltage spread was between 376v and 440v so why would it need to be reduced ?
Yes the machines are from China but the CE is by a German certifying company.

Where are they from CE means something else if from china, ive got some 380v motors on one of my customers lathes and ive fitted transformers to reduce voltage as all control system etc run on same voltage too, i wouldn't recommend you put on UK 3phase without reducing voltage, also check they are not been sent with transformer as spec' you received is usually for the machine and if sold to other markets with different voltage they sometimes ship the relevent transformer with it.

 

[Knobhead]

This may help
View attachment 13392
You might have to save it and enlarge it.

 

[Darkwood]

What you will tend to find is most 3ph is still hovering around the 420ish mark between phases, as tony has shown you the a comparible motor terminal voltage for easier understanding it shouldn't be too much of an issue with the motor itself but as mentioned before its the control system and electronics etc that may be effected, an insight to the machine and its control system is really needed. The regulation voltage (400v) is just a figure on paper and it wasn't that long ago since it was introduced as it used to be 415v but really nothing has changed so in effect you could be putting 40v+ extra into direct into some control gear, if transformers or dc power supplies are within the control system this will reduce the overvoltage proportionally to the output voltage but electronics can be very sensitive to overvoltage.
In a nutshell its dependent on the machine and its component parts and how suseptable to overvoltage they are, as a rule i do transform from 415 - 380 opting for a multi-tap input incase we need to tap at 400v at a later date if supply is brought in line with current given reg' values.