Doerr 220v Electric Motor How to Change Directions?

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Old 01-23-19, 12:54 PM
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Doerr 220v Electric Motor How to Change Directions?

I have a 2hp 220v electric motor that came off a compressor. I am trying to use it on an old surface planer but it turns the wrong direction.. The numbers on the motor are LR22132 and R604935BL803. I have searched this motor and I see there are many types of this motor. It has a capacitor on the top. Under the cover on the motor there are only three wires. White, Black and Green. My guess is I will have to take the back part of the motor off to see the wires inside. Appreciate your Help!!
 
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Old 01-23-19, 01:00 PM
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I forgot to add that there are only the two connection posts under the cover on the motor one for black and one for the white wire?
 
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Old 01-23-19, 02:14 PM
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You need to find the connections to the start winding and reverse them. It doesn't sound like they are readily available.
 
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Old 01-23-19, 07:27 PM
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It's the wires that connect to those terminals coming from inside the motor that would be of interest...top and bottom of the board. Off hand, it is probably a definite purpose motor(compressor) and as such(being 220v) they likely center tapped the phase winding...meaning you might have to go into the winding and lift up connections to locate what you need. As you said, if you had the end off the motor we would know more. Also, if the capacitor is rated 120v, that could be a hint as to how the motor is connected internally.
 
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Old 01-24-19, 04:55 AM
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It would be helpful if you provided all the nameplate info from the motor because there are multiple variables to consider in answering your question.
 
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Old 01-24-19, 11:46 AM
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Doerr was acquired from Grainger by Emerson Electric about 1986 and Emerson Motor Company was acquired by Nidec in 2010. You might try calling Nidec USA engineering at 888-637-7333.


Nidec Motors - Creating Dynamic Motor & Drive Solutions
 
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Old 01-24-19, 11:55 AM
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I am attaching some pictures, does not look promising to me to change directions. There is a capacitor on top. The one picture with the two leads on top left one comes from capacitor, rights one goes to winding's. The other lead from capacitor goes to winding's.
 
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Old 01-24-19, 03:32 PM
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Dreamen...the motor CAN be reversed, what I am trying to decide is if it is practical for you to do so...I still need to know the voltage rating on the capacitor...should be stamped on the side...be careful...capacitors will hold a charge. Your pictures are great but too close in for me to tell for sure where all the wires go, I can only see one end at a time.Perhaps a picture a little farther back, then we will see. Thanks!
 
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Old 01-25-19, 07:50 AM
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I really appreciate your help in this. I put a lot of time in mounting this motor and forgot to check its rotation. Hope these pictures help
 
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Old 01-25-19, 09:16 AM
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Here is a wiring diagram for a typical capacitor start motor, which you have. In order to reverse it you need to reverse the connection on the winding labelled 'aux winding'.

I can see one end of the aux winding connected to the right top on the start switch plate. Unfortunately I can't see the other end of the aux winding.

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Old 01-25-19, 11:24 AM
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Ah..great pictures...
The reason you can only find one side of the phase(aux) winding is because the other side has been center tapped to the main winding, so the connection is buried in the winding ties. However, on a 220v motor with a 120v phase winding(indicated by the 110v capacitor) you can essentially do the same thing with one wire...usually. And I THINK that ONE wire is the wire going from the capacitor to what appears to be the winding, but I am hoping it is only tied to the other lead wire that comes from the same point and goes to the bottom of the terminal block(as per pics). I say that also because if you look at the wire coming from the starting switch and going to the winding, it does appear to me that it is actually connecting to the winding, not just another lead wire. SO...end result...and understand there is a little guess work here...but I would take the wire going from the capacitor to the 'winding' OFF THE CAPACITOR and insulate/tape the wire end really well. I would then run a new wire from that empty capacitor terminal to the TOP terminal of the terminal plate...(which is tricky b/c it is a single spade connection so you may have to pigtail it). The concept here is to put the one phase wire we think we have identified on the OTHER SIDE OF THE LINE...in essence reversing the phase winding with respect to the main winding...all made available by the center tap (which is not shown on the diagram above).
At the risk of farther confusion...I wanted to run the new wire so you could return the motor to its original wiring without a lot of hassle...generally we would have cut the wire from the cap at the 'winding' entrance and ran that to the top terminal post, but then going back to the original state would be more difficult.
Don't hesitate to ask if you are not clear about all this or if my assumptions don't appear correct to you.
 
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Old 01-25-19, 03:11 PM
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Just so I am clear. There are two wires from the top capacitor. One which appears to be a heavier wire goes to the top of the back plate cover on left side. Starter? The other wire from the capacitor goes to the wingdings and is a smaller dia wire. You want me to cut that wire in the middle and tape the one from the capacitor or the end from the winding's? And which ever wire that is not taped is pigtailed too which wire? The one wire from the starting switch seems to go to inside winding and the wire I think you want me to cut from the capacitor goes to an outside winding?
 
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Old 01-25-19, 04:03 PM
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we are close....after you short out the capacitor (to be sure it has no residual charge in it) remove the wire from the capacitor...the smaller wire...it is connected via a spade connector, just pulls off. Don't cut it. Then tape that connector up so it is well insulated. With a NEW wire, and a new spade connector, connect the new wire to the empty terminal on the capacitor (where the small wire used to be connected). The other end of the NEW wire connects to the TOP post of the terminal board..(as it is oriented in today's pictures)
Be sure to use the correct type of wire, no rubber cord etc..if needed you can get a short piece of motor lead wire from any motor shop, #16 or #14.
When you assemble the motor, be very careful not to pinch any wires and keep them out of the rotating mechanism.
ok?
 
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Old 01-25-19, 04:30 PM
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so when you get to the terminal board, you can see there is only one male spade connector (bottom end of the blue line)and it already has a wire on it...these will help...
https://www.amazon.com/Glarks-Insula...SIN=B01ECFCHP4
.
 
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Old 01-25-19, 07:51 PM
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I think I got it!! Will try tomorrow and let you know. I have one of the double connectors.
 
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Old 01-26-19, 06:06 AM
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Motor nameplate usually indicates wires to swap when a split single phase induction motor is manufactured for rotation reversal. This motor nameplate has no such information so I assume what Cloudy is suggesting is the windings would need some disassembly to free the start winding ends and reverse them. Cloudy, Curious about the 110 vac capacitor with a 220 vac line. Could you provide a schematic as how this is accomplished?
 
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Old 01-26-19, 10:11 AM
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WOW!!! By Golly Gee!!! It Worked!!!



Thank You Thank You!
 
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Old 01-26-19, 01:38 PM
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Good job..glad it worked out!!
 
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Old 01-26-19, 01:50 PM
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Bbob...the main winding has 2 'coils'.(3450 rpm)...on a 220v motor..that gives us 110v drop across each one so by connecting one phase wire to the center we can use a 110v phase winding.
 
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Old 01-26-19, 03:54 PM
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Great solution Cloudy. Must be what I call tribal knowledge or tricks of the trade because textbooks don't go into the detail you used to solve the connection for reversal. Since the motor nameplate only listed 220 vac, what gave you the clue the run winding may be center tapped and connected to the start winding?
 
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Old 01-26-19, 04:18 PM
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It was a definite purpose motor..fewer leads = cheaper....and the 120v capacitor...
 
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