Low voltage out of Genset

[one_dusty_hoot]

Fluke is good. Well maybe you have gone about
as far as you can without detailed instructions.
I looked at what information I had on the Onan
8.0 DKD for troubleshooting to see if there was
anything there that might help you, NADA!

Might very well be the printed circuit board.
I would NOT adjust the transformer taps.

Bob Janes '87FC35 Greenville, SC

--- In WanderlodgeForum@yahoogroups.com, "Alan Johnson"
wrote:
>
> Bob,
>
>
>
> Thanks for your help. I should have mentioned that the voltage
readings I
> posted are at the circuit breaker box using a Fluke multimeter. I
took the
> box cover off and measured the volts coming into the main circuit
breakers.
>
>
>
>
> _____
>
> From: WanderlodgeForum@yahoogroups.com
> [mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of
one_dusty_hoot
> Sent: Wednesday, August 23, 2006 10:57 AM
> To: WanderlodgeForum@yahoogroups.com
> Subject: [WanderlodgeForum] Re: Low voltage out of Genset
>
>
>
> Alan, the generator is holding the rpm very well,
> +/- a half cycle, can't get much better than that.
>
> Increasing the speed from 1800 rpm may increase
> your voltage slightly but at the same time all
> AC components like to run on 60 cps, not 65-70,
> whatever it would take, and you would have excess
> heating of the AC motors as well.
>
> Your coach meters indicate they are correct by
> measuring the incoming shore power at 120 VAC.
>
> It is now necessary to measure the voltage by
> a meter other than the coach meters. You need
> to know if the output voltage at the genset is
> the same as what you have read and noted.
>
> If it is the same, then it's generator output V.
> It it is higher, then it's a voltage drop between
> the genset and coach meters.
>
> If it is the same, meaning the generator output
> is low, I don't know the cause. I read that this
> generator did not have brushes and if so they
> cannot be the problem.
>
> If the voltage is higher then you will have to
> trace the lines from the generator to the
> trasfer switch, the common point where you did
> get 120 VAC shore power.
>
> Sorry, this is as far as I can help you.
>
> Bob Janes, '87FC35 Greenville, sc
>
> --- In WanderlodgeForum@
> yahoogroups.com, "Alan"
> wrote:
> >
> > Ok, here are my findings so far.
> >
> > 1. Engine RPMs - right at 1800 (I bought a vibration tach, as
> > suggested.)
> > 2. Frequency stays right between 59.5 and 60.5 whether under
heavy
> > load or not.
> >
> > Leg 1 Leg 2
> > ------ ------
> > No (very little) load 108v 108v
> > Front a/c only 104.5 110
> > Both a/c's on 104 101.5
> > Rear a/c only 100 91 (a/c compressor is having
> > trouble running)
> >
> > When on shore power I've got right at 120v. On the generator, I'm
> > obviously low on voltage all the time, but do these different
> > readings tell you guys anything? Do I just need to up the rpms,
or
> > will that mess up my frequency??
> >
> > Thanks!
> > Alan Johnson
> > 87FC35
> >
> >
> >
> >
> >
> >
> > --- In WanderlodgeForum@ 40yahoogroups.com>
> yahoogroups.com, "Alan"
> > wrote:
> > >
> > > My 87FC35 has a 8.0 kW genset. I am getting low voltage out of
> it
> > > (around 95 volts). On my last onan genset (77 GMC - carbed
gas),
> > > this was a common problem and was simply corrected by
increasing
> > > RPMs. (If this is the fix, how do I adjust idle speed? This
> fuel
> > > injection isn't as intuitive for me as I've been a carburetor
> guy.)
> > >
> > > I found an installation manual for the genset and it says to
> > adjust
> > > some "taps" on a transformer regulator. It also says "output
> > > frequency is determined by engine speed and normally does not
> > > require adjustment." I'm not exactly sure what it means
> > by "output
> > > frequency". Is that voltage??
> > >
> > > Is this problem more complicated than adjusting the RPMs? Maybe
> I
> > > don't have one of the Onan manuals..?? I have a parts manual
and
> > an
> > > installation manual.
> > >
> > > I have searched the forums and did not find a post that seemed
to
> > > address my situation. Let me know if I missed it.
> > >
> > > Thanks in advance,
> > > Alan Johnson
> > > 87FC35
> > >
> >
>
>
>
>
>
> [Non-text portions of this message have been removed]
>