Low voltage out of Genset

[pattypape]

Alan,

On the driver side last rear bay compartment , just under the
utility compartment , we have a 110V circuit breaker box.
This is a good place to measure the generator voltage, directly out
of the gennerator with or without a load. There are 50 amp breakers
in this box, I changed these to a lower amp rating, Because the Onan
is only rated at 8000 watts.
Some 87FC'S did not have the 8K Onan,
Which generator do you have in your 87???

Bill 88 FC Michigan



--- In WanderlodgeForum@yahoogroups.com, "one_dusty_hoot"
wrote:
>
> 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@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
> > >
> >
>