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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

You are here: Experts > Industry > Electric Power/Utilities > Electric Power & Utilities > Marathon B311

Topic: Electric Power & Utilities

Expert: Charles C. Jones
Date: 7/3/2008
Subject: Marathon B311

Question
We have a Marathon B311 motor that we would like to utilize a Dayton 2X440 drum switch with to reverse the rotation. The motor is reversible, but it is not factory pre-wired for switching. The motor is wired for 115V and switching the terminals of 2 and 5 (red and Black) reverses the rotation. Can this be accomplished with the addition of leads from 2 and 5 to the drum switch?

Answer
Due to safety reasons, the only way I wire a drum switch is to bring out all six leads to the drum switch. Any other way may leave one set of terminals "HOT" even though the drum switch is in the off position.

Here is a diagram for the color codes and numbering system:

http://www.flickr.com/photos/96245499@N00/253735324/sizes/m/

And here the actual drum switch wiring diagram:

http://farm1.static.flickr.com/195/466646785_a873232004.jpg

Note: You may or may not have the P2 or P1 lead. It is used for motors with a overload protector.

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