....http://i266.photobucket.com/albums/ii269/theogrit/1sm213sharepopcorn.gif




B,

 

Fixed for you B.

 

What did you do Tom, I get this when I use the "Special" emoticons thread when I use my iPad, did you remove something?



Thank you,,:thumbsup:



B,

 

Needs the image tags Brian

 

So I cant use them when I use my iPad ?sorry for the off topic chat...


B,

 

I have been thinking about this Long and Hard. Based on Leo's statement with which I whole heartedly agree "ALL transformers Hum"
I wish my wife was a Transformer.:devil:

 

Everybody posting here with the exception of a few seem to be missing the OP's concern. Instead most everybody, with the exception of a few, seem to be more concerned over whether or not a transformer should hum or not.

The OP isn't talking about an undetectable hum but rather one that can be heard from a distance AND in relation to the equipment FIVE STAR is speaking of there should never, ever be a detectable hum being emitting from the cabinet at a level that can be heard.

Walking up to the customer and informing them that nothing is perfect, including transformers, is unacceptable, unprofessional, and simply an excuse for not being able to figure out the problem. On top of everything else the customer is left with an ACTUAL problem left unfixed. A problem that is easily to fix.

 

Ok I'll bite how do you fix a humming transformer?

 

Ok I'll bite how do you fix a humming transformer?

I'd use a microphone, amp, speaker, shift the phase to create destructive interference so that you don't hear the hum.

I think when they manufacture the transformers some just arn't laminated properly or the machine that crimps the metal band around them just doesn't crimp it tight enough. Listen carefully and put any transformer to your ear, they all hum.

 

No they don't.

 

Ya, they do.

 

Transformers work via magnetic flux. The laminated core of a transformer is composed of ferrous material, which is mechanically affected by magnetic fields. A well made transformer with tight laminations under normal load will resist mechanical movement pretty well, but none do so completely. Yes, all transformers hum, whether you can hear it with the unaided ear or not.

Loose laminations will obviously not resist mechanical movement as well, and can be the cause of noticeable hum. An overloaded circuit, pulling above-spec current, will create a stronger magnetic flux/mechanical effect than the transformer was designed for and likely create a detectable hum where it wouldn't exist normally.

If everything works as designed and you just have a hum, chances are it's a defective transformer.

ALSO....TRANSFORMERS INSTALLED AT THE FACTORY HAVE A VA RATING. MAKE SURE THERE IS NOT MORE LINEAR FEET OF TSTAT WIRE THAN ALLOWED!!!

This is totally bogus with respect to hum. More wire means less load current, and consequently less potential mechanical action in the laminations.

 

no they don't.

 

So you've discovered a transformer that's impervious to magnetic flux? Pray tell, where might I find such a beast?

 

Ok I'll bite how do you fix a humming transformer?

Hammer and broom

 

So you've discovered a transformer that's impervious to magnetic flux? Pray tell, where might I find such a beast?

Delorian

 

Perhaps they do hum and one may need a stethascope to hear it. I have insalled, wired in, started up, diagnosed a million hvac systems and again, I've only heard a rtansformer hum when there was a problem. Other than that, completely silent. But I've never had a stethascope so who knows but I'm sticking with no they don't.

 

Perhaps they do hum and one may need a stethascope to hear it.

so again, no they don't.

So IOW, because you weren't there when the tree fell, it made no sound.

It's a physics fact, Doc, regardless of whether you've installed a jillion systems.

I do admit that in the practical world of your experience, your absolute statement may appear to hold water. But Momma always told me to beware of absolute statements, because they may very well come back to bite you in the butt. :laughing:

 

so again, no they don't.

 

I don't know about all this but.....

 

Interesting to see were this post is going. Very smart guys here. The way I am reading this, topic. If the transformer does humm, its probably due to a hot heater that has "compromised the lamination. Could be an overloaded / low voltage thing as well. Nonetheless great topic.

 

A transformer with a loose lamination is not a bad transformer, it is a noisy transformer

 

I think we all get the idea...

...transformers hum

...busted ass ones hum louder

...replace the noisy transformer

call it a day.

 

Or smack it with a hammer... :whistling

 

Hammer and broom

Im cleaner. :laughing:

 

throw some water on it.

 

my cheesburger was humming in the pan......now was it the cheesburger that was humming :blink: or was it my electric stove,.......:blink:





B,

 

Let's see if this works..

 

Did your cheeseburger have magnetic flux at a resonant frequency of 60Hz?

 

Yes sir! ....My cheeseburger did have a magnetic flux at a resonant frequency of 60Hz, and once it entered my mouth, I started humming....

.mmmmmmmmmmmmmmm....... this is SO DAM GOOD!!!


B,