Low voltage out of Genset

[John Suter]

Alan,

To Ralph's points (circuit board/regulator issues),
the fact that the voltage drop appears excessively
large when using the rear air, I would add the
possibility of corroded/faulty neutral generator feed
line. If you are sufficiently, technically,
electrically-capable, you could run an additional
temporary/parallel neutral to the rear air from the
gen using #8 or so, to rule in/out the neutral
problem. Don't try this if you have the least doubt
about your capabilities, however.

In your case, the "no load" rise from 108 - 108 to
104.5 - 110 under rear air load, is probably not
significant enough to signal stator/rotor problems;
Were it 90 - 130 or greater, I might have concern.

Do not allow the rear compressor to run any longer
than is absolute minimum time necessary to check the
readings, or damage may result, and avoid any
microwave or other electronics when 90v or below.

John



--- "Ralph L. Fullenwider" wrote:

> Alan:
>
> You have gotten some good advice on this. Do not
> increase the RMS changing
> the freq. It sounds like you have corroded
> connections or weak breakers on
> the gen set. Start by checking the voltage at the
> breakers, the input side
> then the out put. If the voltage drop is not found
> there, check the
> connections in the electrical box (should be just
> inside the gen
> compartment in the upper corner). Of course the
> voltage being read at the
> meters does go through shunts and those reporting
> wire connections could be
> corroded as well. With the readings below, your gent
> set sounds like it is
> fine. I do remember 2 occasions, after checking the
> input side of the
> breakers on the gen set, that the voltage was low
> there and had to replace
> the circuit board on one, and the regulator on the
> other, which took care
> of the problem in both cases.
>
> Safe travels,
>
> Ralph and Charolette Fullenwider
> Ralph's RV Solutions, Duncan, Oklahoma
> http://home.swbell.net/rlf47/index.htm
>
> At 04:38 AM 8/23/2006 +0000, you 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
> >
> >
> >
>
>


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