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Old 07-10-2016, 11:17 AM   #1
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Loud noise from Transfer Switch

I replaced my transfer switch about 18 months ago and have had no issues. Today, it is making an awful LOUD noise when on Gen Power Only. No problems with shore power. Also, it won't power up even just the AC fan. It attempts to start the unit but then shuts down within 3 seconds.

When I first start the gen, it everything is fine. Then, as the gen gets into it rhythm and the RPM'S change a bit, that is when the very loud noise occurs.

Any ideas? Assume I'll have to check the wiring in the transfer switch. Weird though because it worked fine for 18 months so I know I must have wired it correctly.

Thanks
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Old 07-10-2016, 04:56 PM   #2
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What transfer switch did you install.

Do you have any type of meter to check the frequency, it should be 60 hertz. Before I installed my Progressive Surge Protector I used a Kila-watt that had the voltage and hertz output. The generator is probably an inverter type and the output should be 120 volt with 60 hertz.
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Old 07-10-2016, 06:54 PM   #3
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Thanks for the reply. It's an ESCO ES50-65N and the noise it makes when hooked up to gen power is so loud you'd think it was about to explode. Deafening really. This just started happening as it's been hooked up for 18 months. I think I'll call ESCO tomorrow to get some guidance. I may have blown something on the circuit board or possibly the contactor for gen power. Like I said in my post, it works fine on shore power.
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Old 07-11-2016, 09:11 AM   #4
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It sounds like your relay is not pulling in correctly. Many things can cause this problem, so calling the manufacturer is a good first step.
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Old 07-11-2016, 11:12 AM   #5
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I spoke with ESCO and ran the diagnstics. Looks like the problem is a bad pc board. Ordered a new one. If this doesn't fix it, I'll be ordering the LPT50BRD which apparently is much quieter than a working ES50-65N.

Apparently the LPT'S use a DC relay instead of an AC relay.
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Old 07-16-2016, 04:52 PM   #6
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Fixed the problem myself and just wanted to update this thread in case someone else encounters this problem.

So, I check the resistance across the generator contact and it was reading normal. Then I verified incoming voltage from generator and it was within specs. Ended up taking out the pc board and ordered a new one. I received the new one today and the horribly LOUD, deafening buzzing sound persisted. I decided to remove the lower (generator) contact for a closer inspection. I found that a stink bug had crawled in between the contact plates and was preventing a good connection when gen power was on. The lack of a good contact because of the insect (they are fat and bulky) was preventing power to be delivered to the coach AND it caused the metal plate to vibrate crazily. I cleaned out the bug debris, reinstalled the contact, and the problem was solved.

Bottom line, if you notice that the humming is getting much louder from your transfer switch, check to see if any of God's little creatures has made its way in between the contact plates causing increase/abnormal vibration and humming.
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Old 07-17-2016, 05:39 AM   #7
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Glad you found it!

I work maintenance in a CG in the Florida Keys, and it's amazing how many lizards are capable of crawling into the power-pedestal box and committing suicide across the terminals.
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Old 07-17-2016, 07:01 AM   #8
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Quote:
Originally Posted by RustyTools View Post
Glad you found it!

I work maintenance in a CG in the Florida Keys, and it's amazing how many lizards are capable of crawling into the power-pedestal box and committing suicide across the terminals.
:-)
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Old 07-17-2016, 07:18 AM   #9
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I had the exact same problem 3 years ago with the same transfer switch. The stink bugs must like the tight warm space.
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