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About Charles C. Jones
Expertise
Let Me help you with your problems with single phase and three phase electric motors. I can tell you how to troubleshoot your motor problems. From simple testing of capacitors, how to test your windings, replacing bearings, and general maintance. Before we go any further, remember these words of advice: Disconnect the power before you do anything! Please limit your questions to electric motors and there immediate components. I review each question, and if I can answer or help, then I will. If you receive a rejection, it means it is out of my expertise, and just do not have the answer. I'll be waiting for your question, and see if I can help you. Thanks for using AllExperts!
Experience
I have 30 years experience in the repair of electric motors and related equipment. I am a master machinist in the field of motor repair. I have been employed with my company for 27 years. When you ask your question, give me all the information you can about your problem. I have a lots more to add, but for the everyday do-it yourself kinda person, it might get to technical. So ask away, if I can't give you a good answer, I'll find someone who can
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You are here: Experts > Industry > Electric Power/Utilities > Electric Power & Utilities > wiring a 220 volt Doerr motor
Expert: Charles C. Jones - 10/28/2009
Question
I was given a Doerr motor to replace the 3-phase motor on an
old engine lathe (Sheldon) that I just bought. The problem is that there is no wiring diagram on the motor. The specs. on the plate are: 1/2 HP, single phase, 230 volt, 6.0 amp, 850 RPM.
Other numbers on the plate are 74481EL891 and 262-474C1. The wires are labeled T1, T3, T5, T8, T9. That's all the info I have!
Can you tell me how to hook up these wires?
The lathe has an Allen Bradley FWD-REV drum switch that has a diagram. I think I can figure this out if I know what the motor
leads are.
Thanks!
Answer
Les, all I can supply is this NEMA standard wiring diagram,
http://farm1.static.flickr.com/114/253735324_c7d4920bc5_o.jpg
I do not understand why they have a number T3 and T9 brought out from the winding. For a single voltage 230 volt motor, it should be T1-T5 L1, and T4-T8 L2. I would really need to see the motor so I could trace the leads.
Another thing that puzzles me is why you have such a low rpm motor. As I am a machinist, such a low rpm motor is usually seen on large boring machines an large mills. I have two large lathes and one small lathe in my shop, and all these are equipped with 1800 rpm motors.
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