Low voltage out of Genset

[John Suter]

Hi Bob,

> John, excellent point, "assume" can get one
> into a lot of trouble. And yes, I was assuming
> that both leg voltages were nearly equal.
>
> But...Suppose leg 1 had a normal voltage reading
> of 120 VAC and leg 2 read the 95 VAC. Then it
> is possible because of heavy load on leg 2, maybe
> a hi-amp charge rate, or, dragging AC motor, the
> additional current requirement has decreased the
> voltage to 95 VAC and the genset is fine.

True. However, I was attempting to rule out a
potential stator/rotor problem which often presents as
differing leg voltages, regardless of load. I hope we
hear from Alan with information on each leg's voltage
when there is no significant load on either leg.

John

> The only assumption that can safely be made is
> that it did operate properly at one time.
>
> Alan, give us some more infomation on the voltage
> using a multimeter. Could be a defective gage as
> well?
>
> Bob Janes '87FC35 Greenville, SC
>
>
> --- In WanderlodgeForum@yahoogroups.com, John Suter
>
> wrote:
> >
> > Alan, we (the group) are assuming the low voltage
> you
> > report is equally low for both legs. If not,
> advise
> > the as we might have to modify the advice.
> >
> > John Suter
> >
> >
> > --- one_dusty_hoot wrote:
> >
> > > 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
> > > > >
> > > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> > __________________________________________________
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> protection around
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> >
>
>
>
>
>
>


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[one_dusty_hoot]

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
> >
>

[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
> > >
> >
>

[Ralph L. Fullenwider]

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
>
>
>

[The Squires]

Alan,

It actually is holding pretty well from no load to full load. Can you find
any additional taps at the genset? It looks to me that it needs to be
tapped (change your output wires to different terminals) up so that your
zero load is in the 125V range.

Jimmy
-----Original Message-----
From: WanderlodgeForum@yahoogroups.com
[mailto:WanderlodgeForum@yahoogroups.com]On Behalf Of Alan
Sent: Tuesday, August 22, 2006 11:39 PM
To: WanderlodgeForum@yahoogroups.com
Subject: [WanderlodgeForum] Re: Low voltage out of Genset


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
>






[Non-text portions of this message have been removed]

[Alan Johnson]

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@
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]

[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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[Stephen Birtles]

Just a thought but if the rear air seems to be pulling excessive
current Iwould check the fan motor I replaced 2 this rear when I
thought it was power and shore problems it was in fact partially
seized fan motors and when removed in the spring you could not even
turn them with a pair of monster pair of grips
Stephen 77fc35


--- In WanderlodgeForum@yahoogroups.com, John Suter
wrote:
>
> 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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[erniecarpet@...]

Alan, I thought all generators were on a slide. Looks like I learned
something new today.

Ernie Ekberg
83 PT40
Livingston, Montana



[Non-text portions of this message have been removed]

[Alan Johnson]

All,



Here was my latest test. Under the sink going in to the Generator/Shore/Off
switch, I found the wire that is apparently directly from the generator. It
is only hot when the gen is running and it is hot regardless of how the
switch is set. (It is hot when the Generator/Shore/Off switch is set to
OFF.) I tested the voltages on those wires with my Fluke multimeter. With
the genset running, I get the same results there as I do at the input side
of the Main breakers.



Based on what you guys are telling me, I think these are possibly my
problems.

1. Regulator needs to be adjusted. (probably my best case scenario).
Manual mentions that, but not much help on where the regulator is, or how to
adjust it.
2. Circuit board problem (or regulator problem)
3. A corroded/faulty neutral right at the generator itself.



My biggest disappointment when I was looking at this BB, was that the genset
is NOT on a tray. :-( .And low, I'm already feeling the pain from that. I
can't tell where the power comes out of the genset. Does anyone else have
one of these 8.0 DKDs that don't pull out?



Are there any last suggestions before I take this in for service?



Thanks,

Alan Johnson

87FC35







_____

From: WanderlodgeForum@yahoogroups.com
[mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of John Suter
Sent: Wednesday, August 23, 2006 1:42 PM
To: WanderlodgeForum@yahoogroups.com
Subject: Re: [WanderlodgeForum] Re: Low voltage out of Genset



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" net>
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. <http://home.swbell.net/rlf47/index.htm>
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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[Non-text portions of this message have been removed]