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surge guard 3550 making noisy


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When I hooked up my shore power to my inverters, I installed this surge guard. It works just fine. But just this week it has started making a noisy. It comes and goes. It almost sounds like a bus coming and going. It will quit after while. It has done this twice so far. Just this morning went out and found what it was. Have display inside and no faults or anything. Can a relay make this noise. like it internally vibrate for a short time 

Edited by GlennWest

2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1

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Just do it in the mornings. Have my inverters set to change to shorepower at 51 volts. This happens in the early morning hours. This is when this starts. But not every time. So I thinking when the 3550 starts sending current thru it does this. After an hour or so stops. It loud enough that we hear it inside. 

Edited by GlennWest

2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1

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Found problem. My mount was a piece of plywood screwed to a piece of thin plywood. It vibrated. Didn't think it would make that much movement to cause that. Removed it and bolted to floor. did place a 2X6 on floor to raise up. 

2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1

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1 hour ago, GlennWest said:

Found problem. My mount was a piece of plywood screwed to a piece of thin plywood. It vibrated. Didn't think it would make that much movement to cause that. Removed it and bolted to floor. did place a 2X6 on floor to raise up. 

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Well it is still noisy. Believe it is louder now. I may bypass that unit and use the pedestal one. Fairly sure it is faulty. Researched and none reported doing like mine. This morning when it switched over loud thud and unit shut down. My batteries provided power for us but display dead. About an houre later came back on. Had fault and show hi voltage on L1. But when it came on started that thudding noisy. Do this for about an hour. On and off with noisy. It is loud enough to hear even with tv going. There is a contractor in there that engages if power clean. Think it is not closing good. 

Edited by GlennWest

2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1

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