Split Phase motor startup

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  #1  
Old 05-19-15, 04:51 PM
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Split Phase motor startup

I have an industrial mounted fan for my garage that has a 1/4hp Dayton "split Phase" 120v. The motor runs great but it will not start if I don't give the blade a spin manually. Not much point of mounting it to the ceiling if I have to climb a ladder to start it! Any suggestions/ideas?
 
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  #2  
Old 05-19-15, 07:16 PM
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Hi RickD1245,

If the motor won't start except if is started by giving a spin manually, that means that there is a problem (most likely to be mechanical) with the Centrifugal Switch and/or the Startup Winding. Because your fan it does run great after started manually, it means that its Main Winding is working fine. In the case you have an electrical problem is only at the Startup Winding, but most of the time in these cases the problem is due to a mechanical failure.

If the fan is under warranty you should contact its manufacturer; if not, you have to repair it. Sometimes it helps to clean and lubricate the moving parts inside the motor. If not, some parts may need to be mechanically fixed or replaced.

Your actual fan problem is more mechanical than electrical.


Hope this helps.


Thanks.


Jos
 

Last edited by JosiQDIY2015; 05-19-15 at 08:08 PM.
  #3  
Old 05-19-15, 07:31 PM
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The problem could be also due to a faulty Start Capacitor or Electric Relay; but definitely related to the Startup winding only, because your fan motor runs great after being manually started.
 
  #4  
Old 05-19-15, 07:53 PM
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Welcome to the forums.

Can you post the Dayton model number for us ?
 
  #5  
Old 05-20-15, 05:29 AM
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Thanks for everyone's input! The model number is 6k4068. I was hoping that it might be something that I could do, like a capacitor, and not that it is scrap. A new Dayton 1/4hp 1,725rpm motor is over $100 and the fan isn't worth that!
 
  #6  
Old 05-20-15, 07:32 AM
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I've never had a Dayton model number not found. Are you sure what you posted is correct ?
 
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Old 05-20-15, 11:00 AM
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Hi RickD1245,

Your Industrial Fan Split Phase Motor is very likely to don't use a Capacitor. It uses a Startup Winding a Centrifugal Switch and a Main Winding.

This model could be the closest to your model: Dayton 6k406 1/4hp Split Phase Motor.

DAYTON 6K406 Motor, 1/4 HP, Yoke - Walmart.com

These are the listed specs that can be found in the link above about it:

''•10 Ft. Cord & Pull Chain Switch : No
•Ambient (C) : 40
•Bearings : Ball
•Body Dia. (In.) : 5-5/8
•Capacitor Required : No
•Duty : Continuous
•Enclosure : Totally Enclosed Air-Over
•Full Load Amps : 4.7
•HP : 1/4
•Hz : 60
•Insulation Class : B
•Item : Pedestal Fan Motor
•Motor Type : Split-Phase
•Mounting : Yoke
•Nameplate RPM : 1725
•NEMA/IEC Frame : 48YZ
•Number of Speeds : 1
•Overall Length (In.) : 9-5/8
•Phase : 1
•Rotation : CW/CCW
•Service Factor : 1.00
•Shaft Dia. (In.) : 1/2
•Shaft Length (In.) : 2
•Thermal Protection : Auto
•RPM Range : 1701-1800
•Voltage : 115
•Capacitor Included : No
•Overall Length : 9-3/8"
•Shaft Length : 2"
•Frame : 48YZ
•Body Dia. : 5-5/8"
•Ambient Temperature : 40 Degrees C
•Shaft Dia. : 1/2"
•Motor Application : HVAC/R
•Motor Sub Application : Pedestal Fan
•Motor Design : Split-Phase
•Motor Mounting Type : Yoke
•Motor Shaft Rotation : CW/CCW
•Motor Enclosure Design : Totally Enclosed Air-Over''

I found same list of specs at other websites; however, I was unable to find more information about its internal, mechanical and electrical components. In this case the only way to proceed is to open the motor and inspect its mechanical/electrical components in order to determine what is causing the Startup winding to fail.


Thanks a lot.


Jos
 
  #8  
Old 05-20-15, 12:26 PM
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Model #

My eyes are not what they once were so I took a picture of the plate and then blew it up. I only missed it by one - the model is 6K406B, so what I listed as 8 was a B.
 
  #9  
Old 05-20-15, 01:26 PM
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the model is 6K406B
Like this one?

Name:  Dayton 6K406B JGPEG.jpg
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Name:  Dayton 6K406B JGPEG 2.jpg
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Jos
 
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  #10  
Old 05-20-15, 02:19 PM
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That looks like it exactly!
 
  #11  
Old 05-20-15, 02:48 PM
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The information I gave to you is accurate. And therefore your Split Phase Motor don't use a capacitor. It uses a Startup Winding and a Main Winding. Your problem is definitely with the Startup winding only. As I told you best way to proceed is to open it and inspect all its internal components to be able to determine the specific cause of the failure.

Try to find someone locally at a small appliances shop or a neighbor that know how to make repairs to fan motors, etc. that way with luck it can be repaired with around $20 to $40 bucks, maybe less but I am not sure about it.


Good luck.


Jos
 
  #12  
Old 05-20-15, 03:03 PM
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This additional information could be useful:


*Image and information form LEESON Electric Corporation.* Used for Educational Purposes Only.


Name:  Split Phase Information.jpg
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Name:  Split Phase Information 2.jpg
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  #13  
Old 05-20-15, 04:04 PM
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That's an older Dayton motor. I'm almost certain the problem is the centrifugal switch. Remove the end bell nearest the wiring connections & see if centrifugal weights operate freely, and that the switch contacts are clean & not welded together.
Andy
 
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