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Old 02-20-2008, 03:24 PM   #1
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Electric motor/wiring help please.


I'm trying to upgrade/replace the old motor on my wood lathe. I found an old 115volt 1hp Baldor motor. I've wired a regular on/off switch into the new power cord I put on it. Everytime I turn it on it works for just about a minute and then throws either the power strip breaker or the garage breaker in the house. I'm pretty sure the breaker for the garage is 15amp. Looking for possible reasons this is happening....some have told me it could be the capacitor on the motor being shot, others have said that I don't have enough power in my garage?? help please.

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Old 02-20-2008, 06:10 PM   #2
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Electric motor/wiring help please.


The motor could be defective.
The motor could be stuck on the start winding.
The motor could be set for 240 volts.
The circuit could be overloaded. Full load amps on that motor is about 13.5 amps.
The power cord or power strip could be undersized wire.

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Old 02-20-2008, 06:52 PM   #3
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Electric motor/wiring help please.


. .not enough info to be really useful . . .how about this . . .pop off the motor and take it to an electric motor shop and have them determine what you've got?

sorry I couldnt be more useful
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Old 02-21-2008, 08:55 AM   #4
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Electric motor/wiring help please.


Thanks for the replys guys...I found a shop that said they can take a look at it and see if they can figure out the problem...will update when I know more.
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Old 02-21-2008, 10:05 AM   #5
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Electric motor/wiring help please.


A 1.5 hp single phase motor pulls about 13.2 amps and requires much more current to start.

13.2 amps x 1.75 = 23.1 amps You need a 25 amp breaker. NEMA motor amp rating.

Check the price of a new motor before you go to a motor shop. They will charge you an inspection fee, plus parts and labor. You might get a new one for less money.
If you are handy, just replace the breaker (right wire size too) and put new bearings in the motor. You said it does run. Even if the motor shaft turns freely by hand it does not mean the bearings are good.
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Old 02-22-2008, 09:00 AM   #6
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Electric motor/wiring help please.


J.V. I found a electrical shop here locally that will do a quick looksee for no charge. My hope is that it's a quick fix or they have one that I can trade for...If not I will be buying a new motor. I'm handy, but not with electrical...my dad was a contractor and he always had a electrician come in to do electrical work that dealt with the breaker box.
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Old 02-22-2008, 10:04 AM   #7
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If you give me the specs off the motor nameplate I can get you a good price to work with. All the specs.
Is this a special motor or just a NEMA standard. If it is not a NEMA std then you might just have to let the motor shop handle all of it.
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Old 02-22-2008, 12:39 PM   #8
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Electric motor/wiring help please.


J.V. here are the specs...No idea about it being NEMA std?....any help would be most appreciated! Thanks. Jeff

Baldor Single Phase Motor
Spec. 36-3-202
Frame 182 620L
1HP
Volts 115/230
Amps 12/6
RPM 1725
Cycle 62 Ph. 1 Class A
Ser F115 Des L Code K
Rating 55 C
Cat N. L3601 Ser. 969

Last edited by jbksman; 02-22-2008 at 12:40 PM. Reason: forgot one line of specs
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Old 02-25-2008, 10:27 AM   #9
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Electric motor/wiring help please.


J.V. I think my post got pushed back under many others....again any help is greatly appreciated. I did wire a 1/4HP motor to the lathe with a jack shaft...you can see that here. Hope that it is ok to put a link in a post??? ....Jeff
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Old 07-15-2008, 03:04 PM   #10
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Electric motor/wiring help please.


God please answers me! My old motor died 1/4HP, 5 speed, 1075RPM, 115Volt, 5.0AMP. Got new motor the problem is only 3 speed and switch controller has more wires, since I am replacing 5 speed with a 3 speed. New motor does not have any diagram wiring. I do not know where to start. Please help!
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Old 07-15-2008, 03:39 PM   #11
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Electric motor/wiring help please.


Quote:
Originally Posted by J. V. View Post
If you give me the specs off the motor nameplate I can get you a good price to work with. All the specs.
Quote:
Originally Posted by J. V. View Post
Is this a special motor or just a NEMA standard. If it is not a NEMA std then you might just have to let the motor shop handle all of it.


While we're on the subject, how would I find typical power factors for motors like this? It seems to be a state secret.
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Old 07-15-2008, 04:18 PM   #12
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Electric motor/wiring help please.


http://catalog.wegelectric.com/img/Wiring_Diagrams.pdf
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Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC.
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Old 07-16-2008, 11:52 PM   #13
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Electric motor/wiring help please.


Most manufacturers websites will give power factors for their motors at various loads. Since single phase motors are small, and the vast majority of single phase services are not billed for VARs, power factor is generally not an issue.

It's almost comical to read the power factor spec.s of small motors, lightly loaded some of them are around 30%!

Rob
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Old 07-17-2008, 08:42 AM   #14
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Electric motor/wiring help please.


Quote:
Originally Posted by micromind View Post
Most manufacturers websites will give power factors for their motors at various loads. Since single phase motors are small, and the vast majority of single phase services are not billed for VARs, power factor is generally not an issue.

It's almost comical to read the power factor spec.s of small motors, lightly loaded some of them are around 30%!

Rob
So for 1/2 hp or so, I can expect ~80%? (Never mind, just saw your other post).


Last edited by Yoyizit; 07-17-2008 at 08:45 AM.
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