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Old 08-18-2013, 12:45 PM   #1
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Humming noise from converter

I have a humming noise almost all the time from the converter areal in my 2013 Jayco 5th wheel, is that typical?

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Old 08-18-2013, 01:19 PM   #2
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That humming noise is most likely the core laminations of the power transformer in the converter vibrating at 6o Hz. You might be able to tighten up the small bolts or large machine screws that hold the core together. The transformer should have been dipped in varnish before it was installed, but it might not have been sufficiently impregnated.


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Old 08-18-2013, 03:28 PM   #3
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I agree with J Birder. You might check to see how well the converter is bolted to the RV. A few loose screws in the box, or a loose lid could cause the noise. Try pressing on the case when humming, see if you can change the sound. Remounting on a different surface might help too.

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Old 08-18-2013, 04:49 PM   #4
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Yup, I will join the hum along chorus as well.. There are two types of converters, Transformer type which, as they get older they tend to forget the words so they hum along (Ok, that's a joke) Will explain what really happens later.

And Switching units which are much smaller, Lighter and tend not to hum so much.

here is what is happening.

The "Core" (Metal frame) of the transformer is made up of many "leaves" or thin layers of metal, as they stack 'em up they varnish them, the varnish is sticky and holds them all together so they do not vibrate or hum.

As the unit gets older and older the varnish dries out and cracks.. The result is the leaves are now free to vibrate, Hence the HUM
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