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Old 04-18-2016, 05:39 AM   #1
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EMS delay with generator

I have a 2012 AI. When I plug into shore power I get 120 V after a very brief delay - which I assume is due to the Progressive Industries surge protector doing its checking. But when I use the generator there is an immediate brief beep of the microwave then it powers off for a minute or two. During this minute of two the EMS appears to be doing some sort of diagnostics andthen I get power back to the microwave (and everything else). Wondering if others experience this delay when using the generator. If not, any ideas as to what is causing it and how to remedy it?

Or maybe this is something in the generator circuit that forces the generator to warm up a bit before it can absorb load?

Facts or opinions welcomed.
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Old 04-18-2016, 05:56 AM   #2
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It is part of the generator warmup routine. Not a problem.
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Old 04-18-2016, 08:08 AM   #3
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Totally normal.
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Old 04-18-2016, 10:06 AM   #4
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+1 Yes it is normal.


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Old 04-18-2016, 12:51 PM   #5
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Automatic Bus Transfer Switch (ABT)

It could be that your rig has an Automatic Bus Transfer (ABT) switch, or equivalent circuitry built in. These often provide two functions. They are normally generator-seeking, meaning if a generator is hooked up the electric loads will switch to it even if shore power is still available. Now they often include two circuitrys, 1) a time delay of approximately 45 seconds from the time a generator is hooked up and powered, until it then switches over to the generator. This gives the generator a slight warm up before being "hit" with the electric loads. 2) Some also include generator stabilization sensing, such that they don't switch until they sense the generator is stable then they switch to the generator.
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Old 04-19-2016, 05:51 AM   #6
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FWIW, there's an analogous delay in our T1N Interstate when initiating either shore power or generator power. We installed our own internal surge protector and this shore-power-related delay is not related to that... there's some other component in there. You know the expression "it ain't over 'till the fat lady sings"? Well, in our Interstate, it ain't over 'till the microwave light comes on and stays on.
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