"Karl Townsend" wrote in
news

If I were you I'd make 9 legible labels, printing them on label tape.
Then I'd go after that sucker with a connectivity tester, knowing the
standard 9-points-on-a-spiral diagram. Clean the existing labels as

I don't know what you mean here. What's a nine point on a spiral
diagram? FWIW, the wires are labeled u1 u2 u3 v1 v2 v3 w1 w2 w3, not 1
- 9. The little label on the motor cover talks about connections R, S,
and T and I can't find this anywhere. These wires have been soaking
in hydraulic fluid for twenty years - kinda hard on ink.


best you can and use strong light and magnifying lenses. Figure out
what the labels are using your brain and the measured connectivity
data and the labels you can discern, and then relabel them properly.

How do I measure connectivity? Am I looking for a certain ohm reading
between wires? There's 9! (factorial) combinations of wires to test
ohms between. I've done my VERY best at sluething with strong lights
etc. but there's a very real chance I have it wrong as at least four
of the wires are totally unreadable.

Sorry to be such a dumby, I need a little more help here. Or won't it
hurt to just plug it in for 2 seconds to see if it spins? I think its
right, but I don't KNOW its right.

Perhaps this will help. There are 6 windings in your motor. Since each
winding has a wire coming out at each end there are 12 wires to connect.
You only have 9 wires coming out of the motor, so clearly some wires are
already connected.

Three of the windings have both wires coming out, that's 6. Three of the
windings only have one wire coming out for a total of 9. The three wires
left are all wired together inside the motor.

All of the windings have the same resistance. If you take an ohm meter
and start measuring pairs of wires, you will get 3 different answers
depending on which pair you happen to choose. You will get a resistance
we will call R, you will get a resistance of twice R, and you will get a
resistance which pegs the meter which means no connection. You should
get 3 pairs with resistance R. Those are the windings with both wires
coming out and should account for 6 wires. You should get 3 pairs with
resistance 2R which should be the three distinct pairs you can make from
the remaining 3 wires.

In the US at least, the standard way to label the wires is T1 to T9 in
the following way. One pair with resistance R between them will have
wires T1 and T4. One will have T2 and T5. One will have T3 and T6.
The three wires which have the 2R resistance pair by pair are labeled T7,
T8, and T9.

For the lower of the name plate voltages, connect T4,T5,andT6. Connect
T3,T9,L1 (where L means line). Connect T2,T8,L2. Connect T1,T7,L3.
Swapping any two lines will reverse the direction.

For the high voltage, connect T6 and T9. Connect T5 and T8. Connect T4
and T7. Connect each of the remaining wires (T1,T2,T3) to one of the
line wires. Again, swapping any pair of line wires will reverse
direction.