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Old 05-30-2019, 05:52 PM   #1
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Default Ceiling Fans

Hello,
I work on old coast guard dwelling units. Once in a while I run into a specific problem with the ceiling fans. All four ceiling fans make a humming sound. I replace the fans for new ones and all four keep making the same sound. After verifying the main grounded conductor and the grounding conductor and finding no voltage drop or unbalance, I still can not find or fix the problem. I wonder if anybody have an idea of what could be the problem. Thanks.
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Old 05-30-2019, 08:48 PM   #2
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Did you replace them with the same model? Or totally different fans?


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Old 05-30-2019, 09:14 PM   #3
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standard or no wall switch, not controlled by speed controls?
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Old 05-30-2019, 10:27 PM   #4
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Welcome to the forum Carlo.
I have not installed many ceiling fans. Especially the new ones today. I'm sure there will be some help ahead.
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Old 05-31-2019, 08:55 AM   #5
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I'm going to say, cheap fans hum at lower speeds. I haven't installed expensive ones so not sure about them?
Just my 2 cents.


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Old 05-31-2019, 10:05 AM   #6
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Originally Posted by readydave8 View Post
standard or no wall switch, not controlled by speed controls?
I've had speed controls cause this. Sometime very loud and obnoxious humming.
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Old 05-31-2019, 11:44 AM   #7
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Speed controls.

Maybe using one of Telsa's ferrite coils would fix that?
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Old 06-01-2019, 07:38 PM   #8
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Did you replace them with the same model? Or totally different fans?


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Yes. Not only that. I have had installed more than 25 of the same fans. They do not make the noise on all houses, just on a couple of them. On the other houses work just fine. I start to think that could be harmonics or some other problem coming from the transformer side. "That is just a speculation."
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Old 06-01-2019, 09:56 PM   #9
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You sure its not vibration? I installed a fan in my office. As soon as I turned it on you could hear it. Vibration. Little insulation in that area. Was a carport once.
I just took it down and to this very day, there is a round white blank up there......LOL
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Old 06-02-2019, 06:09 PM   #10
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You sure its not vibration? I installed a fan in my office. As soon as I turned it on you could hear it. Vibration. Little insulation in that area. Was a carport once.
I just took it down and to this very day, there is a round white blank up there......LOL
Have you been close to a homing step down transformer. That is the humming I am talking about.
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Old 06-02-2019, 06:12 PM   #11
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How is the power quality out there in PR?
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Old 06-02-2019, 06:23 PM   #12
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How is the power quality out there in PR?
If you mean. voltage values: 248/124volt all over the base. But, that does not explains, three fans on one house are noisy and 6 fans "the same" make no noise on many other houses.
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Old 06-02-2019, 07:02 PM   #13
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I just found this on a simple search "power quality in puerto rico".

When motors do what we don't expect and replacing the motor with a brand new motor results in the same thing, we look beyond the motor. That's the only reason I asked.

https://ieeexplore.ieee.org/document/1338511
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