Reducing Humming Sound

I have 3 2400 tripp lite, they all make noise. Yup, open one up you can get bit pretty good.  I was thinking an enclosures outside the room for me.

I haven't quite figured out what to do yet either. I do notice it.  Those thing are a bit noisy though.. I wonder if a variac would quiet them down. You know a volt or two on the input side, up or down.? Just a thought..
Second, mine you can push down pretty hard on the case and they do quiet down a bit..Bag of lead shot, stand on it, tough to get in a listening position with one foot on each conditioner, what about the third one, I don't want to go there..LOL

Regards

One thing I have noticed, the hum in mine stays the same, no matter what's plugged into it, or if nothing at all is plugged in. THEY HUM..
Maybe the DC offset thing millercarbon offered up is an option.. I'd like to quiet mine down too. I use to have Topaz, Nothing like these..

I'll open one up and look, just need to be careful and discharge the caps a FEW times. I'll take some pics...

Regards

arvincastro OP80 posts03-17-2020 6:53pm@oldhvymec  

While I would love to see what you find out, I do hope you know what you’re doing...please stay safe!

Arvin

Arvin you are a fine fellow, and I will. Here is something my brother, whom I love only like a brother can, taught me. BTW he's retired now but a good and SAFE electrician, by all of his piers. Not me, I know he is..

WHEN the circuit is hot....YOU know it's hot, you know because YOU CHECKED.

Put one hand in you back pocket. PUT ONE HAND IN YOUR BACK POCKET..., hold your pocket. now work with the other hand..

It has never failed me working around a lot of 5-200kv gen sets. Confined space and visual issues.. Trailer mount enclosed..

In this case, two handed and unplugged, to remove the cover.
Find the caps and discharge them. simple to do, BUT noisey
sometimes..pops and such. I use a simple 40 watt bulb #12 wire with
wire clips and a light switch in an elect box..Clip both sides of the caps and flip the switch, a couple of times... and go to each one a couple of times...AGAIN in the box: use one hand to connect, and one hand in you pocket..

Then flip the switch. if you like a little distance. hee hee use longer leeds.. 

WHY??? You don't want it to go through your chest, the discharge can hurt you but through your chest... ok HAND IN YOUR POCKET.

holes in the shoes is a no no too. ok.. water is a no no. NO WATER, or liquids..EVER...DAMP flooring or kneeling is a no no... the path to ground can be a real issue....

Regards

Ok I took it apart.  I'm gonna put a better conductor in the box and hard wire mine in with a shorter cable and a pure copper end.  It has some very small caps inside on a logic board. NO problem with having to discharge ANYTHING....
The transformer has 4 corners, two are secured through the faceplate via the front handle and two are secured directly to the faceplate.  NO vibrational dampening of any type. 
Silicone is the best. Make sure it's NOT for ultra high temp. They use nickel, lead, or tin ALL conductive in some of the cocktails with silicone to get the temp rating HIGHER.
Clear silicone is fine temp wise.   I'm gonna look for silicone washers to go between the two mating surfaces. Fireproof dampening stick on stuff, or I'll just run beads of silicone the length of the enclosure let it set up. Thin bead of silicone on the mating surfaces and put it back together.

I used a thermal gun BEFORE the upgrade after an hour of running 85 degrees, room temp was 70.  We'll see if there is any change temp wise, after the silicone.

It is just a noisy enclosure. Should be easy to fix...

Regards

I took it apart and just used silicone, about a half a tube. I checkerboarded the inside and gave it a little smear. I didn't remove the transformer, I just put a good amount around, the mounts. I also wiped a thin layer on one side of the mating surfaces. Next day back together, about half the noise. I cut two pieces of  in/outdoor carpet close to the same size, one top one bottom, and placed an active XO on top. Pretty quiet now. About 1/2 again. I think with a stick on sound killer, 80% of the noise will be gone.  I'm at about 60% with the carpet..and silicone..

Regards