Machinery hook up

[Toros]

Hi
i am to design the supply to sawing machine imported from Spain that

the label or spec says 125 HP. 174 FLA. @490V

available source is 124/240 3ph 4-wire

i am going to use an dry type transformer operating on 480 to. 120/240 3ph 3 wire but installed on reverse
Is this right ????

tanx



i

 

[petersonra]

Hi
i am to design the supply to sawing machine imported from Spain that

the label or spec says 125 HP. 174 FLA. @490V

available source is 124/240 3ph 4-wire

i am going to use an dry type transformer operating on 480 to. 120/240 3ph 3 wire but installed on reverse
Is this right ????

tanx



i

I think you would just connect up the three 240V lines to the xfmr low voltage side and come out with 480V 3 phase on the high voltage side.

I would caution you on several points. Most European machinery is made to operate on 50 Hz. It may not be appropriate to run it on 60 Hz. It may also work just fine on 60 Hz. It is not possible to even speculate intelligently on this issue without a lot more information.

The other thing is that most European machinery is designed around wye systems so you should probably make sure the 480V side ends up as a wye system.

 

[Tony S]

If you use three wire on European equipment you are liable to run in to problems with the control supply.

Look for a DYn transformer unless you?re absolutely certain about the control. Some countries have a bad habit of using line + ground for control supplies.

I was recently called in to look at a grain drier from an eastern European country, all of the control had to be rewired. They hadn?t even bothered to check on our machine standards (UK) and weren?t happy when final payment was withheld.

 

[Toros]

I think you would just connect up the three 240V lines to the xfmr low voltage side and come out with 480V 3 phase on the high voltage side.

I would caution you on several points. Most European machinery is made to operate on 50 Hz. It may not be appropriate to run it on 60 Hz. It may also work just fine on 60 Hz. It is not possible to even speculate intelligently on this issue without a lot more information.

The other thing is that most European machinery is designed around wye systems so you should probably make sure the 480V side ends up as a wye system.

tanx