Hooking up a 3hp 230V Baldwin motor.

jsbush

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Nov 13, 2000
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I've got a 3HP baldwin motor to replace a burnt motor on a compressor. There's two wires that come out the regulator a red and black. The motor has two black wires. To my understanding in AC electricity red and black are considered hot wires and white is neutral.


Does it matter where I put on wires?
 

brandonbull

Diamond Member
May 3, 2005
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Originally posted by: jsbush
I've got a 3HP baldwin motor to replace a burnt motor on a compressor. There's two wires that come out the regulator a red and black. The motor has two black wires. To my understanding in AC electricity red and black are considered hot wires and white is neutral.


Does it matter where I put on wires?

Not really for single phase. As long as you connect the power leads to the hot wires. For most 230v AC, you would have 2 hot wires and a neutral. White tends to be the neutral wire.

 

brandonbull

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May 3, 2005
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Originally posted by: MisterJackson
That's one thoughtless little pig of a motor!

Yep. He's making an ass out of himself trying to get the wires connected and it doesn't have the brains or the decency to have a wiring diagram on it.

 

jsbush

Diamond Member
Nov 13, 2000
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Originally posted by: brandonbull
Originally posted by: MisterJackson
That's one thoughtless little pig of a motor!

Yep. He's making an ass out of himself trying to get the wires connected and it doesn't have the brains or the decency to have a wiring diagram on it.

huh...
 

Rubycon

Madame President
Aug 10, 2005
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Never heard of a Baldwin motor brand before.

You sure it's not Baldor?

If it's 230V single phase it has to have at least one capacitor. Most of these smaller motors may also have the capability to be wired to run on either 120 or 240VAC. Don't expect it to run off a normal 15A "house plug" on 120V though. :laugh:

In the U.S. red and black are strapped across the line transformer's 240V winding in single phase systems. These are commonly called L1 and L2. Going from either one of these to the white wire (called a neutral) will give you 120VAC. (electrically the neutral could be considered the center tap and at the service entrance this is normally bonded to the bare grounding wire which may be green at the junction box).

Two black wires are OK as well - black denotes hot and in a lot of cases where THNN is pulled through EMT a pair of black wires will be seen but it's generally considered correct to have a red and black. Where common 12/2 with ground is used, the wireman will tape over the white wire so the circuit is not confused with 120V!

Just be certain these are indeed wires belonging to L1 and L2 of your motor and (of course!) do not forget to ground the frame of the motor! If this is confusing you may want to seek help from someone familiar with line voltages as mistakes are often shocking. ;)
 

cKGunslinger

Lifer
Nov 29, 1999
16,410
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Originally posted by: jsbush
Originally posted by: brandonbull
Originally posted by: MisterJackson
That's one thoughtless little pig of a motor!

Yep. He's making an ass out of himself trying to get the wires connected and it doesn't have the brains or the decency to have a wiring diagram on it.

huh...

*whoosh*
 

Mike2002

Senior member
Jan 11, 2004
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Originally posted by: Rubycon
Never heard of a Baldwin motor brand before.

You sure it's not Baldor?

If it's 230V single phase it has to have at least one capacitor. Most of these smaller motors may also have the capability to be wired to run on either 120 or 240VAC. Don't expect it to run off a normal 15A "house plug" on 120V though. :laugh:

In the U.S. red and black are strapped across the line transformer's 240V winding in single phase systems. These are commonly called L1 and L2. Going from either one of these to the white wire (called a neutral) will give you 120VAC. (electrically the neutral could be considered the center tap and at the service entrance this is normally bonded to the bare grounding wire which may be green at the junction box).

Two black wires are OK as well - black denotes hot and in a lot of cases where THNN is pulled through EMT a pair of black wires will be seen but it's generally considered correct to have a red and black. Where common 12/2 with ground is used, the wireman will tape over the white wire so the circuit is not confused with 120V!

Just be certain these are indeed wires belonging to L1 and L2 of your motor and (of course!) do not forget to ground the frame of the motor! If this is confusing you may want to seek help from someone familiar with line voltages as mistakes are often shocking. ;)

Geez Rubycon how do you know so much stuff. You're like the encyclopedia on anything mechanical in the whole world.
 

Rubycon

Madame President
Aug 10, 2005
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485
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Originally posted by: Mike2002

Geez Rubycon how do you know so much stuff. You're like the encyclopedia on anything mechanical in the whole world.

Lots of exposure to many people that know their stuff!

My kitchen is far from ordinary. ;)
 

jsbush

Diamond Member
Nov 13, 2000
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76
Originally posted by: Rubycon
Never heard of a Baldwin motor brand before.

You sure it's not Baldor?

If it's 230V single phase it has to have at least one capacitor. Most of these smaller motors may also have the capability to be wired to run on either 120 or 240VAC. Don't expect it to run off a normal 15A "house plug" on 120V though. :laugh:

In the U.S. red and black are strapped across the line transformer's 240V winding in single phase systems. These are commonly called L1 and L2. Going from either one of these to the white wire (called a neutral) will give you 120VAC. (electrically the neutral could be considered the center tap and at the service entrance this is normally bonded to the bare grounding wire which may be green at the junction box).

Two black wires are OK as well - black denotes hot and in a lot of cases where THNN is pulled through EMT a pair of black wires will be seen but it's generally considered correct to have a red and black. Where common 12/2 with ground is used, the wireman will tape over the white wire so the circuit is not confused with 120V!

Just be certain these are indeed wires belonging to L1 and L2 of your motor and (of course!) do not forget to ground the frame of the motor! If this is confusing you may want to seek help from someone familiar with line voltages as mistakes are often shocking. ;)

This was my understanding of it. Just wanted to be sure before I plugged everything in. Anyways, it works fine now. Yes sorry it is a baldor motor, not a baldwin, lol. Thanks!
 

Old Hippie

Diamond Member
Oct 8, 2005
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Geez Rubycon how do you know so much stuff. You're like the encyclopedia on anything mechanical in the whole world.
Dude, in case you haven't noticed, this is an electrical question.....Which means she knows everything! :Q

Lots of exposure to many people that know their stuff!
OK Ruby, But the thing is, you remember it! :D
 

AMCRambler

Diamond Member
Jan 23, 2001
7,715
31
91
Originally posted by: Rubycon
Never heard of a Baldwin motor brand before.

You sure it's not Baldor?

If it's 230V single phase it has to have at least one capacitor. Most of these smaller motors may also have the capability to be wired to run on either 120 or 240VAC. Don't expect it to run off a normal 15A "house plug" on 120V though. :laugh:

In the U.S. red and black are strapped across the line transformer's 240V winding in single phase systems. These are commonly called L1 and L2. Going from either one of these to the white wire (called a neutral) will give you 120VAC. (electrically the neutral could be considered the center tap and at the service entrance this is normally bonded to the bare grounding wire which may be green at the junction box).

Two black wires are OK as well - black denotes hot and in a lot of cases where THNN is pulled through EMT a pair of black wires will be seen but it's generally considered correct to have a red and black. Where common 12/2 with ground is used, the wireman will tape over the white wire so the circuit is not confused with 120V!

Just be certain these are indeed wires belonging to L1 and L2 of your motor and (of course!) do not forget to ground the frame of the motor! If this is confusing you may want to seek help from someone familiar with line voltages as mistakes are often shocking. ;)

omg! * head asplodes!