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16th Jan 2021, 01:06 PM #1Senior Member
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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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16th Jan 2021, 01:49 PM #2Most Valued Member
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- Aug 2011
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- Melbourne
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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
Sent from my SM-G970F using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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16th Jan 2021, 02:02 PM #3Senior Member
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- Aug 2012
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- Greenmount, W.A.
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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.
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16th Jan 2021, 04:24 PM #4Senior Member
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- Jul 2010
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- Brisbane
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16th Jan 2021, 05:25 PM #5Senior Member
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- Nov 2010
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- Frankston south
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- 102
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
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16th Jan 2021, 06:06 PM #6Senior Member
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- Jul 2010
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- Brisbane
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- 143
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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16th Jan 2021, 06:18 PM #7Most Valued Member
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- Nov 2007
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- melbourne australia
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- 3,228
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
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16th Jan 2021, 09:28 PM #8
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.
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17th Jan 2021, 09:45 AM #9Most Valued Member
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- Nov 2007
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- melbourne australia
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17th Jan 2021, 05:43 PM #10Member
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- Nov 2016
- Location
- Gulfview Heights, Adelaide
- Posts
- 83
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
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17th Jan 2021, 08:13 PM #11Senior Member
- Join Date
- Nov 2010
- Location
- Frankston south
- Posts
- 102
As requested Ken, fan rotates clockwise. IMG_1003.JPGIMG_1004.JPG
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17th Jan 2021, 08:23 PM #12
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.
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17th Jan 2021, 08:34 PM #13Senior Member
- Join Date
- Nov 2010
- Location
- Frankston south
- Posts
- 102
Here’s a pic of my wiring 6726DCE9-1D95-4631-8DDA-9517C0C61007.jpg
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17th Jan 2021, 08:47 PM #14
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.
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17th Jan 2021, 08:48 PM #15Most Valued Member
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- Nov 2007
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- melbourne australia
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