Electric Power & Utilities/Baldor L1408T electric motor

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QUESTION: I have a Baldor L1408T 3 HP 115/220 motor that the capacitors fell out of when the box was opened. It is an old motor and the numbers on the wires and caps are illegible. I can replace the caps from a local supply if I can determine the proper hookup. I am an electronic technician familiar with ac motor wiring and can probably figure out the wire leads, if I can establish the cap sizes this motor requires and a diagram.

I have the wiring diagram from Baldor's website but it does not show all three caps or identify the MFD sizes.

Can you help?

ANSWER: The start capacitors are 850-1050 mfd., 125 volt. The run capacitor is 30uf-370 volt.

---------- FOLLOW-UP ----------

QUESTION: I thank you for your response.

Is the MFD indicated for the start, the sum total of two caps in parallel and do I need to increase the working voltage on them for 220v operation?

Regards

Answer
That is the range for each capacitor. In a dual voltage motor, the start capacitors are always rated for the lower voltage, as the start windings are always connected for 115 volts, regardless of the motor voltage. It is safe to use a higher voltage on the run capacitor.  

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Charles C. Jones

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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 maintenance. 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.

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I have 40 years experience in the repair of electric motors and related equipment. I am a master machinist in the field of motor repair. I was employed with my company for 35 years, but retired in May of 2013. The downside to that is I lost access to a lot of technical data. I will still try to give you the most accurate advice that I can.

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