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Old 06-24-2014, 09:40 PM   #11
2011 Berkshire 390BH
 
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I was looking on another forum for some insight. The opinions there was the transfer switch is only suppose to clunk when it goes from gen-set to shore power and vise-versa, or when you initially plug into shore power. They indicated to check for loose connection within the switch, dirty connections, a bad male connection at the plug end or the shore power coming in was to fault. Tom, you can now take your ear away from the light socket! Lol


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Old 06-24-2014, 10:39 PM   #12
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My understanding is that the transfer switch default is the genertor and should not clunk when going to or on the generator. Since it is a mechanical switch, will only clunk when shore power is applied and then again when disconnected and going back to the default position of the generator. Next time when disconnecting from shore power going to listen for the clunk. Only thinking.
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Old 06-24-2014, 10:54 PM   #13
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Couple weeks ago, I had the MH out at the curb with 100ft of extension cord. When I plugged in, I heard the usual clunk, but then it clunked off and on repeatedly. My Progressive surge protector showed a good E0 code but then a funny P something. Also the voltage was low ( because of the. Cord). I then got out a heavy duty cord, the voltage was good, but the same P code. I then plugged the cord into the 20 amp outlet that I installed for storage, the P code went away and the clunking stopped.

The transfer switch is a electro-mechanical relay and should not be gone on and off repeatedly. Each time it does, there is an arc across the contacts and this will wear the switch out eventually.

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Old 06-24-2014, 11:13 PM   #14
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Quote:
Originally Posted by I-RV View Post
Couple weeks ago, I had the MH out at the curb with 100ft of extension cord. When I plugged in, I heard the usual clunk, but then it clunked off and on repeatedly. My Progressive surge protector showed a good E0 code but then a funny P something. Also the voltage was low ( because of the. Cord). I then got out a heavy duty cord, the voltage was good, but the same P code. I then plugged the cord into the 20 amp outlet that I installed for storage, the P code went away and the clunking stopped.

The transfer switch is a electro-mechanical relay and should not be gone on and off repeatedly. Each time it does, there is an arc across the contacts and this will wear the switch out eventually.

Hank
Adding to what you said-The transfer switch is really a two position contactor. In the normal state it connects to the generator output, in the energized state the contactor with power from shore will energize the magnetic coil and pull up a armature carrying contacts to the shore power position. That's why with gen running, it stays on shore power. The clunk is the armature reaching its travel and the contacts closing. If it clunks with power applied at random something is wrong. Could be it begins to fall out and the surge of the coil pulls it back in.

This contactor is break before make to prevent parallel of generator and shorepower. You can imagine trying to power the power company with the onboard genset. Anyway intermittent opening will destroy the contactor. I suspect the closing circuit is part electronic and that's probably where the problem lies.
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