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Old 05-03-2012, 05:51 PM   #1
tkb
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Default Motor Connections
We just installed new Baldor 40hp and 60hp Super-E motors today and the windings are a delta configutation.
I can't say I've seen that in a motor in a long time.

The 208 connections were 1-7-6, 2-8-4, 3-9-5.
http://dl.dropbox.com/u/33217279/Pag...%20EM4314T.pdf

When the guys energized the 60hp motor it drew over 300 amps and tripped out the drive before it even got to 10hz.

When we megged out the windings it turned out that the 4 and 7 leads were mismarked from the factory.

How does Baldor let that happen?
Aren't all large motors tested before they leave the factory?

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Old 05-03-2012, 08:17 PM   #2
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Originally Posted by tkb View Post
...
How does Baldor let that happen?
Aren't all large motors tested before they leave the factory?
One would think. But remeber, Baldor isn't Baldor any longer, it's ABB now.

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Old 05-03-2012, 08:21 PM   #3
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Quote:
Originally Posted by tkb View Post
We just installed new Baldor 40hp and 60hp Super-E motors today and the windings are a delta configutation.
I can't say I've seen that in a motor in a long time.

The 208 connections were 1-7-6, 2-8-4, 3-9-5.
http://dl.dropbox.com/u/33217279/Pag...%20EM4314T.pdf

When the guys energized the 60hp motor it drew over 300 amps and tripped out the drive before it even got to 10hz.

When we megged out the windings it turned out that the 4 and 7 leads were mismarked from the factory.

How does Baldor let that happen?
Aren't all large motors tested before they leave the factory?
wow thats very bad
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Old 05-03-2012, 08:45 PM   #4
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About 12 years ago I installed a new 10 HP Baldor for an air compressor.
The rear windings "Fell off" the first night.
It
Wasn't secured to the rest of the windings. Man did the sparks fly on that one. LoL
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Old 05-04-2012, 12:10 PM   #5
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About 12 years ago I installed a new 10 HP Baldor for an air compressor.
The rear windings "Fell off" the first night.
It
Wasn't secured to the rest of the windings. Man did the sparks fly on that one. LoL

What do you mean by the "rear" windings? And how can a winding fall off?
The windings travel the complete length of the motor and cannot fall off.
Did you mean the end bell fell off?
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Old 05-04-2012, 12:31 PM   #6
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Originally Posted by John Valdes

What do you mean by the "rear" windings? And how can a winding fall off?
The windings travel the complete length of the motor and cannot fall off.
Did you mean the end bell fell off?
No the end bell didn't fall off.
One winding had been wrapped in a coil and was slipped over the rear of the winding bundle.
It was a factory Opps. When we wired it and was about to start it up is when I came walking into the space. We didn't look closely at it before we installed it. It was just a replacement motor for a dual unit Quincy compressor.
It started a with a bang, like it had a problem breaking free and slowly came up almost to speed. Then the bundle fell back towards the end cap and went BANG.
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Old 05-08-2012, 12:08 AM   #7
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I've seen a few mismarked leads, not very often though.

The really tricky ones are when the ends of the same coil are mismarked. Like 1 and 4. Takes a while to figure those out.

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