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Old 10-14-2015, 10:13 AM   #1
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Progressive ems hardwired "HUM"

In speaking with a progressive industries tech today about my 30 amp hardwired ems, I asked him about a hum some people have commented or complained about.

He said that's a "60 hertz" hum and can be almost totally eliminated by installing rubber washers under the four mounting points of the case which he recommended if your unit hums or not as the unit should have air space under it to keep it cooler but not necessary if unit cannot be raised off the floor.

Just an fyi.

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Old 10-14-2015, 10:15 AM   #2
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Good tip. Do you ever work? Later RJD
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Old 10-14-2015, 10:27 AM   #3
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I thought of this too. Mine hums too...I just blamed it on being mounted on cardboard...I mean an interior wall. Thanks


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Old 10-14-2015, 10:31 AM   #4
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Yes, I used rubber grommets for the "feet" when I secured it to the floor.
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Old 10-14-2015, 11:16 AM   #5
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Good tip. Do you ever work? Later RJD
No.

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Old 10-14-2015, 11:16 AM   #6
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Gentlemen suggested 1/2" thick rubber spacers.

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Old 10-14-2015, 11:25 AM   #7
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Thanks for giving me another project. (sarcasm)
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Old 10-14-2015, 11:26 AM   #8
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"Sarcasm" dually noted!

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Old 10-14-2015, 11:52 AM   #9
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On the EMS unit and my water pump I use rubber washers under the feet and under the screw head. I make the hole on the feet bigger so that the screw going through the feet does not touch the sides of the hole in the feet This gives total isolation and the noise transference goes WAY down. If you don't use rubber under the screw head the screw will touch the unit case and still transfer noise to the trailer.

There are fancy grommets you can buy that will take care of both sides of a foot. Something like this: http://www.armadarubber.com/isolation.html

Maybe as an option Progressive Industries could offer rubber isolators in the feet as an option.
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Old 10-14-2015, 12:31 PM   #10
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Progressive EMS 30 Amp Hard Wired Hum Experience

Quote:
Originally Posted by TURBS View Post
In speaking with a progressive industries tech today about my 30 amp hardwired ems, I asked him about a hum some people have commented or complained about.

He said that's a "60 hertz" hum and can be almost totally eliminated by installing rubber washers under the four mounting points of the case which he recommended if your unit hums or not as the unit should have air space under it to keep it cooler but not necessary if unit cannot be raised off the floor.

Just an fyi.

TURBS
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2015 camping "30 nights"
A while back I was one of the people who had asked you about it through a private message. I had just installed mine and it was humming like crazy. I called Progressive and the tech told me it was most likely due to the contacts in the contactor not making one hundred percent connection due to the cosmoline protectant they utilize during manufacturing to prevent corrosion before use. He told me to turn on as many loads as I could in the RV, then cycle my breaker at my power post panel numerous times allowing the contactor to actuate and each time it did so the heat from the arc would burn off the excess cosmoline and resolve the problem. He was correct in my situation, as after about a dozen times the hum was gone.

I could feel the vibration so strong before that it was traveling down the romex wire several feet that came out of the EMS and went to the power convertor. I had even installed extra wiring hold downs and tried the rubber under the mounting area of the EMS.

This may not be everyone's issue, but on new installations where the unit has not cycled off and on some it may very well be. Just wanted to pass along my personal experience in hopes it will help someone down the road.
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Old 10-14-2015, 12:34 PM   #11
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I've never heard mine hum, which is why I asked the tech.
I'm more informed now to!

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Old 10-14-2015, 12:36 PM   #12
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The armature in the relay is what is buzzing actually. If the contacts where buzzing there would be sparks and smoke.
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Old 10-14-2015, 12:40 PM   #13
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Quote:
Originally Posted by Ramblin Recks View Post
Yes, I used rubber grommets for the "feet" when I secured it to the floor.
Did it stop the hum?
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Old 10-14-2015, 01:05 PM   #14
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The armature in the relay is what is buzzing actually. If the contacts where buzzing there would be sparks and smoke.
Just relaying exactly what the tech told me and what worked for me. I see your point though, and maybe I didn't get into enough technical detail to describe the issue from an electrical engineers stand point. But, my hum was gone, my unit has worked flawlessly and I had hopes of assisting someone else if they had the same issue as I.
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Old 10-14-2015, 01:12 PM   #15
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lol mine doesn't hum but it has hawed.
(insert duck my head here - cause DW just read this and went to slap me)

good to know that the air under it keeps it cool.
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Old 10-14-2015, 07:59 PM   #16
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The REAL reason for it to hum?

It does not know the words!
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Old 10-14-2015, 08:28 PM   #17
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Good tip. Do you ever work? Later RJD
According to a very reliable source, he goes to a "place where other people work."
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Old 10-15-2015, 12:37 AM   #18
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Better if use softer rubber. Need 2 per screw. One on each side of screw.
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Old 10-15-2015, 06:32 AM   #19
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I have to wonder......
Is this happening with 30 or 50 amp units?

I had a 30 and never heard a hum.

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Old 10-15-2015, 06:40 AM   #20
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I have the 50 amp installed in my TT and have never heard any hum at all.
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