Motor

What, like inside the motor terminal box?

The original equipment manufacturer shoudl be contacted in the first instance to confirm that in the six pairs of terminals inside the terminal box cover, U1 is opposite V2, V1 is opposite W2, and W1 is opposite U2. Otherwise, the motor would be very difficult to configure in delta, with three terminal links installed, or in star with only two links installed.

Ring the manufacturer to confirm.

PWSlack,

you are so optimistic, things in 3rd world countries are not as simple as in UK..

I am sure this is a motor collected from a scrapp yard and our guest is trying to install it somewhere..

Dear Guest,

you can use a ohm-meter to locate each coil, for the start and end of each coil, the wires coming from the top layer of windings is the end...easy

There is no indication of any country in Anonymous Poster's post.

Star delta starters

For Forward Rotation

L1-U1, V2

L2-V1, W2

L3-W1, V2

For Reverse Rotation

L1-V1, U2

L2-U1, W2

L3-W1, V2

Where L1, L2 & L3 are 3 phases...........u,v,w are motor winding terminals....

dol starters

For Forward Rotation

L1-U

L2-V

L3-W

For Reverse Rotation

L1-W

L2-V

L3-U

I think you all got the OP wrong. His questions is: having found out three sets of windings - after checking the continuity, how to tag starts (U1, V1 & W1)) and ends (U2, V2 & W2) of these three sets of windings. Remember there are no existing tags.

This can be done by a simple polarity test. Keep two windings open. Now for the third winding assume a certain terminal as "U1" and the other terminal of this winding as "U2". Connect a DC Source (a 1.5V Cell perhaps), thro a Push Switch, with "Positive" of the Cell to the assumed "U1" and the "Negative" of the Cell to the assumed "U2". Connect a "Zero-Center Galvanometer" to one of the other two windings with the assumed "V1" to positive of the meter and the assumed "V2" to the negative of the meter.

With this connections, when you press the push switch and inject a pulsed DC to the assumed "U1" & "U2", the zero centre galvanmometer would deflect in the positive direction, if the assumed "V1" & "V2" are correct. Else, the meter would deflect in the reverse. One can chenge the connections and test again.

This can be repeated for the third winding too.

sorry...my bad......thought he was askin fo circuit connections.......