Wiring a three phase motor

[A Trebor]

Motor on 6 inch auger went bang, sent it off to be looked at and made a note of connections, motor not repairable so ended up with a new one, know how to wire it up but should it be done star or delta? Electrician in hospital having on op today so not available to ask

 

[goodevans]

Motor on 6 inch auger went bang, sent it off to be looked at and made a note of connections, motor not repairable so ended up with a new one, know how to wire it up but should it be done star or delta? Electrician in hospital having on op today so not available to ask

Theres normally a diagram on the inside of the terminal cover,but I bet you it will go the wrong way first time

 

[A Trebor]

Theres normally a diagram on the inside of the terminal cover,but I bet you it will go the wrong way first time

There is but it shows it for delta and star, know what colours to what terminals but don’t know which way to do it

 

[Barry7529]

There is but it shows it for delta and star, know what colours to what terminals but don’t know which way to do it
[/QUOTE

There is but it shows it for delta and star, know what colours to what terminals but don’t know which way to do it

Can you show us a photo of the motor nameplate. Can tell you from that

 

[spark plug]

is the motor wired to the 3 phase mains with a box with a start and stop button?

 

[Netherfield]

Delta is what you want

 

[335d]

When you made a note of the connections, I take it you didn’t note the way the links were? Or have a photo?

 

[Lincsman]

Do you not have a star delta starter on it?.. its a big auger for it not to be... in which case you use six wires.

 

[milkloss]

Probably delta as it makes use of the torque available from three phase(440v per coil). Wye is simply 3 coils of single phase, runs nice and smooth but no power.

 

[mixed breed]

Does this help?

 

[A Trebor]

@spark plug pm sent
@Barry7529

 

[njneer]

Only thing I know , or at least I was told , about three phase is that, depending on how it’s wired , motors can drive in either direction and changing any two phases over will reverse the direction , again I was told this many years ago and have not tried it .
I stand to be corrected or told I am talking “shot” at any time by anyone who knows this is or isn’t factually correct.

 

[Netherfield]

Factually correct, changing any two phases changes the rotation.

 

[Pheasant Surprise]

Only thing I know , or at least I was told , about three phase is that, depending on how it’s wired , motors can drive in either direction and changing any two phases over will reverse the direction , again I was told this many years ago and have not tried it .
I stand to be corrected or told I am talking “shot” at any time by anyone who knows this is or isn’t factually correct.

Yes it’s definitely correct. A good spark will check phase rotation is according to the manufacturer before energising. This can be easily checked with the proper meter. Some gear / pumps etc doesn’t like to be run in reverse. So it’s important to get right.

 

[Barry7529]

@spark plug pm sent
@Barry7529

@spark plug pm sent
@Barry7529

The motor is wired delta. If it rotates the auger the wrong way simply swap 2of the phases over

 

[Lincsman]

@spark plug pm sent
@Barry7529

Pretty sure that needs a star delta starter, I saw and old auger today thats 5kw with a star delta starter fitted

 

[Pheasant Surprise]

Pretty sure that needs a star delta starter, I saw and old auger today thats 5kw with a star delta starter fitted

It a big old motor for direct online (DOL) starting.

The photo of the nameplate from the OP suggests 11A per phase run current in delta. If you were to start it in Delta / DOL it could draw anywhere between 55 and 66 Amps.

Simple test is will it trip the breaker in DOL start.

 

[Courier]

And nine times out of ten you will find that it will rotate in the opposite manner to that which you desire at the first attempt