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  1. #1
    Join Date
    Jul 2010
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    Brisbane
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    143

    Default Industrial Betts motors... running hot !

    Hi .. Just finished the resto on my Fanmaster industrial fan..goes OK, just seems to run very hot... After a few minutes the motor is so hot you cannot hold your hand on it. What I find unusual is the lack of ventilation !!.. no holes in the front cover, and a cone cap on the other end..
    How do these Betts motors keep cool ?
    Ken.
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  2. #2
    Join Date
    Aug 2011
    Location
    Melbourne
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    4,779

    Default

    Is it the bearings running hot?

    The reason I ask is that in once took apart a 3ph motor to convert to delta. It was in good condition, in fact I think it was new old stock.

    But when I pushed to two end back together and tightened the bolts that press the bearings back into the ends, I must have tightened them unevenly or not in correct order. The result was that the rotar bearings at each end were not seated perfectly in line. The motor still turned nicely by hand but when run for a few minutes without any load, the motor got hot. It was from the bearing getting warm.

    I took it apart and re-torqued the bolts gradually and evenly and it was fine.

    Lesson learned.

    Simon



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  3. #3
    Join Date
    Aug 2012
    Location
    Greenmount, W.A.
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    70
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    272

    Default

    The fan is supposed to keep the motor cool.

    Was it running before you started your work?
    Did you do any re-cabling of the supply?

    I take it the fan is single phase?
    If yes, does it have a centrifugal switch to open the "start" winding after it is running?
    If yes, does it open?

    Have you measured the current going into the fan?

    A picture of the terminals would help.

  4. #4
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    Jul 2010
    Location
    Brisbane
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    Default

    Quote Originally Posted by A J in WA View Post
    The fan is supposed to keep the motor cool.

    Was it running before you started your work?
    Did you do any re-cabling of the supply?

    I take it the fan is single phase?
    If yes, does it have a centrifugal switch to open the "start" winding after it is running?
    If yes, does it open?

    Have you measured the current going into the fan?

    A picture of the terminals would help.
    When I was given it, it had an exploded start capacitor that i replaced with a new one..no re-cabling was done by me...
    10 Min ago I removed the back cover.. will take some pics and update soon as i can.
    Ken

  5. #5
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    102

    Default

    I have a Fanmaster with a Betts motor, although it is open at the front. I have a Paramount that is sealed and runs with no issue. Capacitor on mine is 4 microfarad

  6. #6
    Join Date
    Jul 2010
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    Brisbane
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    Default

    Motor is single phase, 1.1 amp, 120 watts out..AOM Duty.
    Just cannot get any air flowing over the motor..
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  7. #7
    Join Date
    Nov 2007
    Location
    melbourne australia
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    3,228

    Default

    As AJ alluded to, the motor may have a centrifugal switch to engage a start winding. If that switch fails in the closed position the start winding will overheat very quickly. That would be worth investing I think. I doubt it’s lack of cooling airflow as the fan has been designed to run in that configuration.
    Chris

  8. #8
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
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    Default

    Hi Guys,

    Motors that small don't usually have a centrifugal switch !

    The windings usually have one end commoned to the neutral wire and the capacitor connected between the other ends. The live feed going to one end of the capacitor, depending upon direction.

    I don't think that the wiring is correct.

    Small motor.jpg
    It shouldn't make any difference if the ends of the windings are swapped over, the motor will run the other way.

    If there is a centrifugal switch it will be wired in series with the start winding.
    HTH.
    Best Regards:
    Baron J.

  9. #9
    Join Date
    Nov 2007
    Location
    melbourne australia
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    Default

    Quote Originally Posted by BaronJ View Post
    Motors that small don't usually have a centrifugal switch !
    True, but I can't think what else would cause the motor to get that hot. If no centrifugal switch and the capactor is new, perhaps it is wired correctly as you suggest.
    Chris

  10. #10
    Join Date
    Nov 2016
    Location
    Gulfview Heights, Adelaide
    Posts
    83

    Default

    Have you checked the motor windings to see if there is any damage to them?
    Maybe the old capacitor caused some damage somewhere when it exploded?
    You could try another start capacitor?

    Paul

  11. #11
    Join Date
    Nov 2010
    Location
    Frankston south
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    102

    Default

    As requested Ken, fan rotates clockwise. IMG_1003.JPGIMG_1004.JPG

  12. #12
    Join Date
    Sep 2012
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    York, North Yorkshire UK
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    Default

    Hi Guys,

    Looking at the motor wiring the right hand picture, the mains input live wire, appears to be connected to the end of two windings, the ones coloured red and white.

    The mains neutral appears to be connected to the end of one winding and one side of the capacitor. There is another terminal marked (4) which doesn't seem to have any connection to it other than the blue wire.

    The capacitor is connected to the other wire with a white marker. This leaves a blue wire without a connection !

    It would be informative to know which wires are connected to which winding and if its is a dual voltage motor.

    The overheating could be that its wired for 110 volts and on a 240 volt circuit !
    Best Regards:
    Baron J.

  13. #13
    Join Date
    Nov 2010
    Location
    Frankston south
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    Default

    Quote Originally Posted by BaronJ View Post
    Hi Guys,

    Looking at the motor wiring the right hand picture, the mains input live wire, appears to be connected to the end of two windings, the ones coloured red and white.

    The mains neutral appears to be connected to the end of one winding and one side of the capacitor. There is another terminal marked (4) which doesn't seem to have any connection to it other than the blue wire.

    The capacitor is connected to the other wire with a white marker. This leaves a blue wire without a connection !

    It would be informative to know which wires are connected to which winding and if its is a dual voltage motor.

    The overheating could be that its wired for 110 volts and on a 240 volt circuit !
    Here’s a pic of my wiring 6726DCE9-1D95-4631-8DDA-9517C0C61007.jpg
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  14. #14
    Join Date
    Sep 2012
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    York, North Yorkshire UK
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    Default

    Hi Waxen,

    Thank you for the pictures, but it doesn't really help, the angle doesn't allow the wiring to be identified.

    However do you have four or five wires on yours, and is it a dual voltage motor ?

    Dual voltage is the only way I can account for five wires ! A single voltage motor without a centrifugal switch would have two windings and four wires, with a centrifugal switch there would be six connections.
    Best Regards:
    Baron J.

  15. #15
    Join Date
    Nov 2007
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    melbourne australia
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    Default

    Quote Originally Posted by BaronJ View Post
    The overheating could be that its wired for 110 volts and on a 240 volt circuit !
    That would certainly do it!
    Chris

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