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Old 12-14-2011, 06:42 PM   #1
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Default 6 Lead Motor

I found this on another site. I figured someone here would know. Looks to be IEC standard, not Nema


We have a 125 HP, 3 phase, 480VAC motor that has six leads coming out of the motor. Two leads are labeled "U2", two are labeled "V2", and two are labeled "W2". So I have 3 pairs of leads with the same label on them. Checking resistance between any two of the leads labeled the same indicates no continuity. However, you can read continuity between a U,V,W set. This indicates to me that there are two independent sets of motor windings. The debate between my co-workers is how to connect this motor. The thoughts are to connect both wires labeled the same to a leg of 3 phase. The other is to only connect one set of windings to the 3 phase. By the way, the motor cover shows a connection diagram for 9 wires. Any help is greatly appreciated.
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Old 12-14-2011, 06:54 PM   #2
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paging Motorwinder
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Old 12-14-2011, 07:04 PM   #3
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paging Motorwinder

Or The Frenchman

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Old 12-14-2011, 07:06 PM   #4
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I've never seen this, but if I did, I would tie the matched pairs together, one set to each phase.
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Old 12-14-2011, 07:12 PM   #5
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It's been a while since I've had to deal with that and I'm probably way off but I believe you do have two windings. Start and run. Usually these motors have parallel feeds. The draw for start up is much greater than run. There should actually be sensitive technology telling relays in which phase of the process the motor is in. I've run into this on fire pumps before. All technology was contained in the pump controller. Ok y'all go ahead and hammer me now
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Old 12-14-2011, 07:23 PM   #6
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I think you have a Single Voltage--External Delta Connection.

http://www.electricmotorwarehouse.co...n_diagrams.htm
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Old 12-14-2011, 07:26 PM   #7
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The stiff may be correct
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Old 12-14-2011, 07:27 PM   #8
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It's been a while since I've had to deal with that and I'm probably way off but I believe you do have two windings. Start and run. Usually these motors have parallel feeds. The draw for start up is much greater than run. There should actually be sensitive technology telling relays in which phase of the process the motor is in. I've run into this on fire pumps before. All technology was contained in the pump controller. Ok y'all go ahead and hammer me now
You're describing a wye/delta starter, and the windings are not labeled the same. Think about it, how would you know which leads to attach to the delta contactor and which to the wye?
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Old 12-14-2011, 07:43 PM   #9
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You're describing a wye/delta starter, and the windings are not labeled the same. Think about it, how would you know which leads to attach to the delta contactor and which to the wye?
Possibly. But I'm sure I've run across similar situation. Three leads and two sets. Had to pull out 500 and parallel smaller cable for start and run. Delta/ wye I've ever come across has specific diagram for both configurations, no leads labeled the same
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Old 12-14-2011, 07:46 PM   #10
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With all the advances in VFDs, do they even use Wye start Delta run motor controllers anymore?
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Old 12-14-2011, 08:33 PM   #11
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Finally a motor question.

Hook the wires marked the same to each other. U2 to U2, V2 to V2, Ect.. for each phase.

It's a star connected motor with the leads paralleled, so you can use smaller lead wire.

Next..
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Old 12-14-2011, 08:40 PM   #12
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I really am a motor winder BTW. This is the one I did today..


Back to the regular scheduled program..
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Old 12-14-2011, 08:43 PM   #13
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I really am a motor winder BTW. This is the one I did today..

Back to the regular scheduled program..
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Old 12-14-2011, 08:55 PM   #14
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Old 12-14-2011, 09:01 PM   #15
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I knew you would be the one to figure it out.



And it's not dual voltage, or Delta Start Wye run ?

Last edited by dronai; 12-14-2011 at 09:34 PM.
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Old 12-14-2011, 09:13 PM   #16
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Finally a motor question.

Hook the wires marked the same to each other. U2 to U2, V2 to V2, Ect.. for each phase.

It's a star connected motor with the leads paralleled, so you can use smaller lead wire.

Next..
Exactly.

This motor is suitable for part-winding start, but not wye-delta.

Last week, I connected a couple of 450HP motors that had 4 sets of T1, T2 and T3s.

Think of it as 4 motors in one frame.

Big generators are like this as well.
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Old 12-14-2011, 10:52 PM   #17
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Quote:
Originally Posted by hardworkingstiff
With all the advances in VFDs, do they even use Wye start Delta run motor controllers anymore?
There are still a lot of plants using both air and refrigeration compressors that use wye-start delta-run controls.

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Old 12-15-2011, 12:00 AM   #18
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The stiff may be correct
Who is a stiff..?
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Old 12-15-2011, 12:48 AM   #19
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With all the advances in VFDs, do they even use Wye start Delta run motor controllers anymore?
One reason is because old-timers can repair a wye-delta starter, but not anything electronic.
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Old 12-15-2011, 12:52 AM   #20
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Quote:
Originally Posted by micromind

One reason is because old-timers can repair a wye-delta starter, but not anything electronic.
No..... In a lot of these plants, maintenance still goes by "If it ain't broke, don't fix it!"


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