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Three Phase Motor with Ten (10) Leads

12/07/2017 4:36 PM

We have a motor with 10 leads connected to 240 3p 60 hz, and we need to change to 480 volts 3p 60 hz.

The existing connection for the low voltage (240) is the following:

4+5+6+0

T1+1+7, T2+2+8, T3+3+9

Thank you

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#1

Re: Three Phase Motor with ten (10) leads

12/07/2017 6:02 PM

If it is a dual voltage motor, there should be a diagram on the tag that has the proper wiring configuration....What is the make and model of the motor? I'm not familiar with a 10 lead motor, usually it's 6. 9 or 12.....the 9 and 12 are usually dual voltage motors

..."Three-phase motors with 9 leads are nearly always dual-voltage motors. Connecting these is a bit more complicated, and mistakes are actually common. Typically, these motors don’t permit a wye start with delta run; you can usually wire them only for a delta start. But there are exceptions (IEC motors, for example).

For the wye start, dual voltage nine lead motor on the lower voltage, connect 1 and 7 to L1, 2 and 8 to L2, and 3 and 9 to L3. Connect the remaining leads (4, 5, and 6) together. For the higher voltage, connect 1 to L1, 2 to L2, and 3 to L3. Connect 4 to 7, 5 to 8, and 6 to 9.

For the delta start, dual voltage nine lead motor on the lower voltage, connect 1, 6, and 7 to L1. Connect 2, 4, and 8 to L2. Connect 3, 5, and 9 to L3. For the higher voltage, connect 1 to L1, 2 to L2, and 3 to L3. Connect 4 to 7, 5 to 8, and 6 to 9."...

http://www.goevans.com/filesSite/EHB_pgs0803.pdf

http://www.ecmweb.com/electrical-testing/motor-wiring-part-2

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#2
In reply to #1

Re: Three Phase Motor with ten (10) leads

12/07/2017 7:39 PM

The information of the motor is the following:

Pope Machinery Corporation, HaverHill, Mass, USA

Style P32 TH , serial AJ1986

1.5 HP - 3150 RPM, 516 SPL frame,

220/440 V - 60 Hz -

Thanks

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#4
In reply to #2

Re: Three Phase Motor with ten (10) leads

12/07/2017 7:54 PM
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#5
In reply to #4

Re: Three Phase Motor with ten (10) leads

12/07/2017 8:01 PM

They are out of market, long time ago.

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#6
In reply to #1

Re: Three Phase Motor with ten (10) leads

12/07/2017 9:36 PM

I'm not familiar with a 10 lead motor...

It seems that the number of leads would have to be divisible by 3. Perhaps the 10th lead is frame ground, easy for the OP to check out.

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#8
In reply to #6

Re: Three Phase Motor with ten (10) leads

12/07/2017 11:02 PM

Could be, this is a unique antique before NEMA ratings motor, we don't know the history, it may have been rewired at some point for a special purpose, or maybe they did it like that in the old days....but I guess he can figure it out with a little time and a multimeter,, dusted carefully with a bit of common sense....If not well it certainly is replaceable...

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#3

Re: Three Phase Motor with ten (10) leads

12/07/2017 7:52 PM

Seems to me that you have a dual voltage star motor.

If it is as I suspect, the motor will have 6 windings, 3 of which will have a permanent star point (most likely the other ends of 7, 8 & 9). It's possible that terminal 0 is the star point for 7, 8 & 9, and that it is also being used to form a common star point for both windings in your present case or it may be that it is simply a joining post with no connection to other windings.

The other windings will be 1-4, 2-5, 3-6. You can easily do a continuity test to confirm (or rebut) any or all of the above.

It would appear to be connected in low voltage star formation at present as shown below in Cct A, where the connections match your description and so form two star windings in parallel. Terminal 0 may or may not be common to both stars.

To convert to high voltage (still star) connect as in Cct B

Or... I may be totally wrong

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#7
In reply to #3

Re: Three Phase Motor with ten (10) leads

12/07/2017 10:51 PM

I missed a connection on Cct A - revision below

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#9

Re: Three Phase Motor with ten (10) leads

12/08/2017 6:02 AM

RubenQ100, what about a photo upload of the motor terminal block and of the control contactors. We may be able to confirm some of the wiring posts.

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#10
In reply to #9

Re: Three Phase Motor with ten (10) leads

12/08/2017 10:07 AM

Hello:

The motor has only the wires, no terminal block.

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#11
In reply to #10

Re: Three Phase Motor with ten (10) leads

12/08/2017 11:13 AM

That's a GE motor for a Pope spindle....

These are rebuilders for Pope spindles...

http://motorcityrepair.com/oem-spindles-we-service/pope-spindle-repair/

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#12
In reply to #10

Re: Three Phase Motor with ten (10) leads

12/08/2017 12:21 PM

Louis Allis manufacture

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#13
In reply to #12

Re: Three Phase Motor with ten (10) leads

12/08/2017 12:29 PM

Yes on his...there seems to be different motor manufacturers...

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#14

Re: Three Phase Motor with Ten (10) Leads

12/08/2017 1:05 PM

This is the correct wiring for this motor

Thanks to All of you

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#15
In reply to #14

Re: Three Phase Motor with Ten (10) Leads

12/08/2017 1:50 PM

The first sentence of the first post....(sic)

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#16

Re: Three Phase Motor with Ten (10) Leads

12/08/2017 5:08 PM

It sounds like you mean that 9 of the leads are conductors and 1 of the leads is a ground.

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#17
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Re: Three Phase Motor with Ten (10) Leads

12/08/2017 5:54 PM

Not at all, when is connected to high (440V) the T0 is not connected

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#18
In reply to #17

Re: Three Phase Motor with Ten (10) Leads

12/11/2017 1:13 PM

Take A DVM and check lead #10 against motor case, to see if a ground. Usually when there are multiple leads shorted by tying together, it is not a bad idea to ground those, especially when they have no connection to L1, L2, or L3.

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