Low voltage out of Genset

[one_dusty_hoot]

Alan, the genset puts out 2 cycles per revolution,it
should run at 1800 rpm, govenor controlled. This would
output 1800 X 2=60 cycles per second. As load is
increased, the speed decreases, then more fuel is
given by the govenor to maintain speed.

Look at the governor next on the motor, there is an
arm that goes against a stop when the generator is
started. There at the stop point is the speed adjustment.

Before you start adjusting the stop you need to know
what speed your motor is turning. You can buy a
vibration tachometer at small motor repair shops.
You can move the wand in and out by turning the
knob. When the harmonic frequency is reached, the
extended arm will begin vibrating rapidly. Mayve $20?

Do not attempt to adjust speed without something as
a reference.

Your problem may be that the motor is running sour,
could be the air filter is clogged, and possibly not
enough diesel by a dirty filter?

Bob Janes 87FC35 Greenville, SC




--- In WanderlodgeForum@yahoogroups.com, Curt Sprenger
wrote:
>
> I'm not an expert but found this on the Internet. For an
oscillating or
> varying current, frequency is the number of complete cycles per
second
> in alternating current direction. The standard unit of frequency is
the
> hertz, abbreviated Hz. If a current completes one cycle per second,
then
> the frequency is 1 Hz; 60 cycles per second equals 60 Hz (the
standard
> alternating-current utility frequency in the United States).
>
> I recall the Onan guy adjusting rpms on our previous gen. set to
get the
> frequency to 60 and to increase voltage.
>
> Sounds to me you are on the right track. If you can, turn up the
rpms
> and watch for voltage increase. Good luck. Please keep us posted.
>
> Curt Sprenger 1987 PT38, Anaheim Hills, Calif.
>
>
>
> 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
> >
> >
>