How to conect 3 phase motor 9 yellow wires from t1 to t9
Now I know that I supposed to Connect t4,t5,t6 together. Connect t1,t7 together for line 1. Connect t2,t8 together for line 2. Connect t3,t9 for line 3. However, I don't know which two are power cables and which one is neutral
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Rewire for ?? High voltage motor wiring is L1-T1, L2-T2, L3-T3, T4-T7, T5-T8, T6-T9. Low voltage is L1-T1-T4, L2-T2-T5, L3-T3-T6. The motor protection overloads will need to be sized accordingly, to the motor's FLA ( full load amps) for the voltage used. The control needs to be looked at also, if there is a control transformer, the transformer needs to be wired or repaced for the new supply power voltage used.
M8 in the serial number of your watch signifies that it was manufactured in 1968. Here is a list of codes that are used to identify the year the watch was manufactured just in case you were curious. A8 = 1948
A9 = 1949
Single phase motor for 230V, connect T4 and T5, to one line. T2, T3, T8 common connected. T1 to other line. Check Rotation, This should be for CCW rotation facing output shaft. Swap T5 and T8 for CW rotation.
motor leads on a three phase are T1, T2, T3, T4, T5, T6, T7, T8, T9. for high voltage  L1 to T1, L2 to T2, L3 to T3, connect together and tape - T4-T7, T5-T8, T6-T9. For LOW voltage  L1 to T1 & T7 & tape, L2 to T2-T8 & tape, L3 to T3 & T9 & tape. T4-T5-T6 together and tape.
the neutral or white is not used. if the fourth wire is a ground then it goes to the motor frame. if it is a dual voltage motor then here is the wiring: for 240 volt 3 phase connect 4-5-6 together and tape, 3-9 goes on L1, 2-8 together goes on L2, 1-7 together goes on L3. To reverse direction swap any two line wires. For 480 volts 3 phase: L1 goes on T1, L2 goes on T2, L3 goes on T3. Connect together T6-T9 and tape, connect T5-T8 and tape, connect T4-T7 and tape. again to reverse direction swap two line wires.