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Emerson 29648 runs backwards


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Posted (edited)

Hi all !

 

I’m a newby and I own a voltmeter and I’ve read a lot about testing resistance and I’m confused as to where I’m testing to and from. Can anyone refer me to a source for that information or tell me where to test?

I bought this Emerson 29648 at an antique store for $100.  It sat in a closet for many years until my recent retirement. 

I got it out and plugged it in and it runs great…but it runs backwards!

So I changed B and C.  The motor runs much better and doesn’t smoke now (!!). 

But it’s still running backwards. The fan blade looks like it might have been a replacement fan blade… and maybe it’s backwards? I.e. the pitch of the blades is backwards?

Any suggestions for a newby would be appreciated!

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Edited by Dave Kraus
Duplicate text
Posted

Still not wired correctly, blade is correct. When I get one like that, I label three wires ABC, the others 123, then start going through the combinations

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Posted (edited)

Dave, did you quote my query from a few years back?  That passage looks awfully familiar 😉   Did you check the resistance between each pair of the three (disconnected from switch) wires A, B, and C coming out of the stator?  That is, resistance between A-B, A-C, and B-C ?  If so, what were the readings?

Be sure to take lots of pics first before disconnecting anything, so you can see how the wires go back in place.  Label the three stator wires also (A, B, and C), as well as the three wires on the switch (1, 2, and 3) to which the three stator wires are connected.  Hope that all made sense!

Edited by Todd Adornato
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Posted (edited)

I used different colored electric tape to mark each wire as previous owner had it wired. At the stator and at the switch then cut away the old wires. 
I re-soldered wires at the stator which I had identified the wires with different colored electric tape prior to the switch and coming from the switch. 
I hooked it up how previous owner had it. 
Todd, thanks for clarification where I’m measuring. 
So if I’m understanding, I’ll record 6 readings among the 3 wires. I’ll be looking for a high, medium, and low resistance.
Help me understand how I identify each individual wire as the high, medium, and low resistance. I think I see how from diagram I reposted. But still unsure. 
I’m out of town at the moment… 
I’ll post the readings when I’m home after the holidays. 
Thank you both for your input!

Dave 

Edited by Dave Kraus
Added clarification
Posted (edited)
1 hour ago, Dave Kraus said:

I used different colored electric tape to mark each wire as previous owner had it wired. At the stator and at the switch then cut away the old wires. 
I re-soldered wires at the stator which I had identified the wires with different colored electric tape prior to the switch and coming from the switch. 
I hooked it up how previous owner had it. 
Todd, thanks for clarification where I’m measuring. 
So if I’m understanding, I’ll record 6 readings among the 3 wires. I’ll be looking for a high, medium, and low resistance.
Help me understand how I identify each individual wire as the high, medium, and low resistance. I think I see how from diagram I reposted. But still unsure. 
I’m out of town at the moment… 
I’ll post the readings when I’m home after the holidays. 
Thank you both for your input!

Dave 

Dave,

I believe - could be wrong - you’ll need to separate the stator wires from the switch wires to get proper readings. At least, I’ve always measured while either the stator or the switch was out of the fan. Using the ends of the three stator wires, you would record three readings, not six: A to B, A to C, and B to C.    A properly set up fan will show three resistance values - a high reading, a low reading, and a third in between those two.  As I understand it and have seen on the handful of fans I’ve measured, the medium and low readings added together should be the same as, or very close to, the high reading.  Then you use the diagram to wire the fan.

Edited by Todd Adornato
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Posted

Oh. Gotcha 

I have the new wires I soldered to the stator marked with colored tape (and the same for the wires coming from the 3 speed control-which I’ll ignore for now).


Then I’ll follow your instructions above for the wires coming from the stator. 

Then hook up according to diagram provided Tom Newcity (?) 

Thank you Todd !!

Posted

Keep in mind that if something got hot enough to smoke, you likely already damaged insulation irreparably. You may find that you need to replace whichever part was smoking. 

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Posted

Try this little technique.  Works on 29648 also.

emerson stator to spd cntrl hookup.jpg

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  • 2 weeks later...
Posted

Ok. I sorted the wires out as described and connected them as described and … viola! It turns clockwise i.e. the correct direction. 

Thank you all for walking me through the process!

Now…. When I plug the fan in… it hums/buzzes and won’t start on its own without a little nudge. 
The center post is greased and the rotor turns freely. 
Sould I clean the contact between the rotor and stator with some steel wool… or a specific solvent? 
Any suggestions? 
Thank you!

Dave 

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Posted

Wait a second! 
it hummed/buzzed when I wired as above …
it was turning correctly but unknown to me… wires B had come disconnected. 
so, I connected them … and now it runs counterclockwise!  So, I switched wires B and C … and … it ran counterclockwise again. 
If I disconnect wires B (center of coil for on/off speed adjustment) it runs clockwise but not without a nudge. 
Now I’m Stumped! 
Any words of wisdom?

thank you

Dave 

Posted
Posted

First question is who told you to use grease on the rotor shaft?  You are blocking the flow of the oil to lubricate the rotor shaft.  You need to flush out all of the grease, making sure that the oil slots on the rotor shaft are clear.   

Second question is has the fan ever started on its own?  

Posted

Oh? I can remove grease from shaft. 
As I said, I’m a newby. 
Yes, when all 3 wires are connected, it starts on its own… but runs backwards. I switched wires B and C and it starts on its own but runs backwards either way.
It runs clockwise if I leave wire connected to the center DISconnected. However, it hums/buzzes and needs a nudge to start spinning. 


**Update

**It spins clockwise if I nudge it clockwise… and counterclockwise if I nudge it counterclockwise when the center wire on on/off switch is disconnected when I plug it in to power. In this configuration, only wires A and B from Tom’s diagram are connected. Wire C is disconnected. 
 

Does this paint a clear picture of the problem?

Thank you for any advice 

Dave

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Posted

Could you please number the stator wires 1,2,3 or provide what numbers the colored tape represent in reference to my diagram?  I seem to have missed your explanation.

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Posted

Also provide the ohms readings.

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Posted
36 minutes ago, Thomas Newcity said:

Also provide the ohms readings from the 3 stator wires.

Also, with the 3 stator wires disconnected from the speed control, take ohms readings from the speed control top wire to each of the 3 solder points on the base of the control.  

Also, when connecting wires together, the wires should be bare for a good connection.  

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Posted

Thanks Tom:

The gunk on the wires is flux. I was getting ready to solder but stopped. 
 

Measurements in ohms:

from the wires soldered to stator:

A-B 29.6 ohms

A-C 14.5

B-C 42.2

from the top of speed control (A) to each of the 3 soldered points of the speed control (1,2,3)

A-1 17.5

A-2 17.1

A-3 15.9

Wire to wire on speed control:

Top Wire (A) 

Wire soldered to one of 2 screws to wall plug (B)

Wire soldered to speed control (C)

 

A-B 0

A-C 16

B-C 0

Does this provide any clarity?

thank you for your help!

Daveimage.thumb.jpg.5a782fe93b8c890618c501ba31f7df31.jpg

 

 

Posted

Switch B and C.  According to your data and my diagram, B is #1, A is #2, and C is #3.  That means that #1 to #2 is the High pair and #2 to #3 the Low pair.  

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Posted

Wooohooo!!  Thank you Tom !!

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