SW fault [RE-wrenches]

Mon May 13 00:59:39 PDT 2002

Travis,

Thanks for your response.

I did not realise that the sync. in LBX was load dependant.  I guess that that means
that if the LBTX is achieved and the load drops before the SW is in sync and the LBTX
low voltage level is not sustained, the whole process starts again.

Once the LBTX was achieved I expected the sync to be quick.  I guess I waited a
couple of minutes.

I take it that the SW would 'voltage cycle' even if the incoming grid volts were
absent !?

I will be out at the site again later in the week so I will check the system in float
more first.

Carl E.

"Travis Creswell, Ozark Solar" wrote:

> I'm not sure how the 230v 50hz versions operate.  I know that when the US
> version of the SW is not synced to the AC source (anytime the "AC1(2) IN
> GOOD" light flashing), the reading on the SW's meter goes up then comes back
> down at a very predictable rate.  The first time I saw it happen I was a
> little shocked but I've since noticed that every SW I've installed does it.
> I always assumed it was taking voltage samples at some point on the sine
> wave then displaying that voltage sample (stupid design, yes) and that as
> long as the RMS voltage stayed within the window there was no problem with
> the unit hooking back up to the grid.
>
> But, you say that yours isn't connecting back to the grid.  Still, it might
> not be a problem with the inverter.  I assume that you observed the system
> while the voltage approached then reached the LBX transfer point and it
> didn't transfer back to the grid?  How long did you wait?  If the loads are
> light it might take hours. I fiddled with LBX on several units but it was
> always a problem getting to work anywhere near where I wanted it to.  LBX
> just hasn't proved to be a very useful or easy to implement feature.  If you
> switch the inverter back to FLOAT mode does it hook back up to the grid in
> the usual minute or so?
>
> Travis Creswell
> Ozark Energy Services
>
> ----------
> >From: "Carl Emerson, Free Power Ltd." <freepower at freepower.co.nz>
> >To: RE-wrenches at topica.com
> >Subject: Re: SW fault [RE-wrenches]
> >Date: Sat, May 11, 2002, 12:34 AM
> >
>
> >Hi there,
> >
> >I was out at a site today that has been in flawless service as a 'stand alone'
> >for about 5 years.
> >
> >The client has just had the grid connected and I programmed the SW for LBX mode.
> >
> >When I tested the LBX cutting in I noticed the AC1 meter reading was 'hunting'
> >over a wide AC voltage range and not reading the grid volts correctly. It was
> >cycling continually from 175 to 260 volts on a 240 volt system.
> >
> >Because of this the SW failed to synchronize with the grid and refused to come
> >on charge.
> >
> >Is this a common fault ?
> >
> >I noticed the AC2 was also 'hunting' and not giving a stable reading of the
> >generators output. We managed to bet the generator to sync. so that saved the
> >embarrassment of a flat bank.
> >
> >I would be interested to know what causes this fault if anyone knows.
> >
> >Thanks
> >
> >Carl Emerson
> >
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--
Regards,

Carl Emerson
Manager
FREEPOWER LTD.  "Harnessing Natural Energy"
P.O. Box 10-1207 N.S.M.C. Auckland, NEW ZEALAND.
Ph. 09 4275206 fax 09 4275208  cell 021-633999  web www.freepower.co.nz

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