SW4024 with control problems [RE-wrenches]

[Mark Edmunds]

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Hi Drake,

I think Matt is on the right track. Check the reason why the inverter
thinks it needs to start the gen, under Menu Heading 2. A Voltage Start
would confirm the cable drop issue.

Cheers,

Mark



Mark Edmunds
Xantrex Technology Inc.

-----Original Message-----

Drake,

Wow; is this de ja vu, or what? I just got back from an off-grid install
I put in a number of years ago with very similar symptoms. In this case,
however, I think I've traced all the problems back to a 4/0 cable
connection (-) that managed to loosen-up over about 4 years. It wasn't
so difficult to find the problem, seeing as how the DC bonding block got
hot enough to fry some of the insulation off a controller lead connected
to the same block. =(:-0 !!

The report from the owners (who never seem to check anything until it
breaks) was that: in auto mode the generator would run for hours, stop
for about 15 minutes, then run for hours, ad nauseum. Even with the
genny going full-tilt the bad connection prevented a full charge from
ever being accomplished (for very long). I am not a big fan of the
bonding block arrangement in the Trace DC box for several reasons, not
the least of which is it's deep location - way to one side, which can be
a hassle in some installations.

So, even if your problem is not the negative connection, I suggest
re-torquing all the connections within the DC enclosure to original
spec's as a preventative measure. But you probably already did that!

Matt T

Drake Chamberlin wrote:

>
> Hi Wrenches,
>
> I'm working on an SW4024 that is being used in as a grid back up, that

> exhibited two strange malfunctions while on the wall.
>
> 1)  It would take several seconds to come on after the grid was shut
off.
>
> 2) Whenever the generator was in the AUTO mode, it would run the 
> generator.   OFF turned the generator off, but AUTO works the same as 
> ON.  The battery bank is full and the generator goes on even with very

> small loads, so it doesn't appear to be a load start issue.
>
> After cold starting the inverter, it would work normally for a short 
> time, then revert to its strange behavior.
>
> Now the inverter is in the shop, but they can't find anything wrong 
> with it.  Does anyone have any idea what is going on?
>
> Thanks,
>
> Drake
>
> 

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