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Reversing the direction of an AC capacitor 1/2 HP Emerson circa1962 motor

Reversing the direction of an AC capacitor 1/2 HP Emerson circa1962 motor


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Old 09-27-14, 05:08 PM
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Reversing the direction of an AC capacitor 1/2 HP Emerson circa1962 motor

I spent hours building a stand for a rock lapidary unit, and more hours hooking up the electrical. I was so pleased with myself until I turned it on. Everything worked great but the motor turns in the wrong direction.
The motor information plate is almost completely worn off. I can see that it is a type KS. Other numbers on it are a 60, a "50 Cont.", a large 13V is stamped on and 1725 which may be speed?
I don't know how to describe the terminal connections.
There are 4 nuts with the black wire from the plug going to the lower left connection. The white wire goes up inside to a circular connection that has another white wire. (Maybe a switch for the capacitor)
All the wires inside the motor between the terminals are white. Describing how they are connected and what they do is beyond me so I took pictures.

I'm 68 and an accomplished DIYer but I've never worked with electrical motors. Although I've read some of the other forums I am not familiar with the motor world terminologies.
Thank you for your time and for your suggestions.Name:  2015-04-15 20.26.17.jpg
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Last edited by Daulton Ruff; 09-27-14 at 05:09 PM. Reason: add photo
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Old 09-27-14, 05:13 PM
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Welcome to the forums.

Give us a picture of the inside of the wiring junction box.
Make it bright and closeup...... just the junction box.
 
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Old 09-27-14, 05:14 PM
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added photo

I'll try to add another photoAttachment 38961
Note how the four terminals, one hidden behind the black wire.
 
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Last edited by ray2047; 09-27-14 at 05:23 PM. Reason: Add image.
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Old 09-27-14, 05:26 PM
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I need a picture like this. Move the power cord too. If we can't see the posts in the box then we can't really help you.

Name:  2015-04-15 20.25.41.jpg
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Old 09-27-14, 06:01 PM
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Ok, done. If more pictures are needed I can do that . Thanks.
 
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Old 09-27-14, 06:54 PM
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Trying to upload new pictures. Having problems

Can't seem to get the picture upload to work.
 
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Old 09-27-14, 07:16 PM
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I've left you a private message. If you go to the top of the screen and click on private messages... you'll see it.
 
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Old 09-28-14, 02:36 PM
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attempt to send photo

In the first two photos the 4 terminals can be seen. The white wire goes up into the motor to what I presume might be a centrifuge switch.
Thank anyone, in particular PJmax, for viewing and for taking the time to help me with this

Name:  motor 1.jpg
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Last edited by PJmax; 09-28-14 at 05:21 PM. Reason: posted pic
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Old 09-28-14, 02:48 PM
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You only posted one picture. I put it in your post.

I was hoping to see labeling for the terminals.
I suspect those white wires come from the capacitor.
This may not be a reversible motor. The start winding would need to come out and be attached to the posts. The centrifugal switch is probably mounted on the back of that plate.

The only thing you can try is reversing those two white wires and see what happens.

If that doesn't change the rotation...... you would need to take the motor to a shop where they would open it up and possibly be able to change the start wiring orientation.
 

Last edited by ray2047; 09-28-14 at 03:55 PM. Reason: wound>would
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Old 09-28-14, 04:05 PM
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I'm going to hope for a minute that I can reverse the motor. For my clarification lets number the four terminals from top and from left to right. The forceps is nearest number 4. Before I came to the forum I tried attaching the black to the white wire and the white wire at number three, thus reversing the black and white wire which resulted in a popped breaker.
Exactly how do I reverse the two wires on the four terminals? Would you go from 1 to 2 with the first white wire? Then the 4 terminal wire goes to number 3?
 
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Old 09-28-14, 05:24 PM
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I went back and renumbered your picture. I see an internal white wire on #1 and internal white wire on #2. Switch those. Keep your power cord where it was if the motor was working correctly.
 
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Old 09-28-14, 07:24 PM
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Ok I'll try that in the morning. Thanks for your reply and I'll let you know what happens. Nice job numbering the terminals. I was wishing I knew how to do that.
 
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Old 09-28-14, 07:46 PM
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Someday when you want to play. Copy a picture in your computer or use one that isn't needed.
Right click on it and choose " open with paint". Once in the paint program you can draw anything on the picture and put in titles. You can always backstep to erase a mistake and you can always close paint and choose "don't save changes".

I taught myself how to use it based on Kevin... a past HVAC pro.
 
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Old 09-28-14, 08:40 PM
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IRFanView (free) is useful for cropping and resizing images. Gimp (free) is a bit frustrating to learn to use but is good for transparencies and doing layers.

Actually Gimp can do just about everything but it is just more difficult to use IMHO. I use a paint program or IRFanView for most things because they are easier.
 
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Old 09-29-14, 10:29 AM
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Tried several switched wires but failed to make motor reverse direction

Good morning. Thanks for the suggestions. I'll try messing with that later. I have Windows 8.1. I used to be the person people came to with their computer problems at my old job as super of the Whse at the VA in Fresno. Now I have to get my son to solve my problems.
Anyway, I just tried several combinations that failed to reverse the direction of the motor.
first I moved the wire to connect terminal 1 and 2, and 3 and 4, which popped the breaker.
Then I tried 1 to 4 and 3 to 2 and nothing happened. Then I tried moving my power to terminal 1 instead of 2 and it popped the breaker.

Do I have to conclude that I can't change the direction or is there something I haven't thought of?
 
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Old 09-29-14, 08:54 PM
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Fixed! My son came over and applied logic and methodology.

My son figured it out within 15 minutes. He systematically looked at the circuit and tried what I had not. After 3 tries it worked. He had never worked on motors either but is just inherently intelligent.
Thanks to TJmax and Ray for replying and helping me with this issue.

I have another old Singer sewing machine motor that reverses each time you apply power, but I'll save that for another post when I need to use it.
 
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Old 09-29-14, 09:10 PM
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Nice job Now enjoy your project.
 
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Old 09-30-14, 04:52 AM
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I am starting to mess with the collection of rocks we have picked up over the years and will make a flat lap grinder once the snow flies.
Can we see what you have built?
 
 

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