Low voltage out of Genset
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08-24-2006, 16:14
Post: #26
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Low voltage out of Genset
All,
Here's an update. I went by Parker Power Systems here in Dallas today to pick up a service manual (I drove the coach over there just in case I could get someone to help me.) .More of us should go in the APU business. They are all backed up 3-4 weeks before they can work on something. Anyway, one of the guys there was really helpful. He came out and spent about 30 minutes on my genset. I have an Onan model "DKD". He said even when the were new they were always a little low on the voltage. But since mine was running around 59.5 hertz, that we should bump it up to 61 hertz. So he did. We increased the rpms slightly till it was putting out right around 61 hertz. That seemed to give me a significant boost in volts. I think it will put me around 110-115v. I say "I think" because I haven't finished tightening everything up and then re-checking voltages under different loads. Hopefully this will be the end of this issue. I'll send out another update just to let everyone know for sure. Thanks for all your help. Alan Johnson 87FC35 _____ From: WanderlodgeForum@yahoogroups.com [mailto:WanderlodgeForum@yahoogroups.com] On Behalf Of John Suter Sent: Thursday, August 24, 2006 10:59 AM To: WanderlodgeForum@yahoogroups.com Subject: RE: [WanderlodgeForum] Re: Low voltage out of Genset Alan, > 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. I assume you disconnected the shore power to complete this test to eliminate the possibility you would read voltage other than gen provided. Be veeeery careful, as the fact you are able to measure voltage with the disconnect switch off may indicate you are measuring a neutral wire that is being backfed from some other source, or the disconnect switch itself has become faulty and is passing current, or you are not measuring the leg(s) you believe. The measured wire might be used for metering, wherein it would drive an independent volt meter somewhere, whether or not the power source is coupled to anything else thru your disconnect. Understand your digital Fluke meter presents a very light resistive load so it can measure voltage; however, the same measurement position, when coupled with an appliance resistive load might drop the voltage reading to zero on the meter, although the full voltage could be present. John Suter --- Alan Johnson wrote: > 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" > 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. <http://home.swbell.net/rlf47/index.htm> 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 > > > > > > > > > > > > > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam > protection around > http://mail. <http://mail. <http://mail.yahoo.com> yahoo.com> yahoo.com > > > > > > [Non-text portions of this message have been > removed] > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail. <http://mail.yahoo.com> yahoo.com [Non-text portions of this message have been removed] |
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Messages In This Thread |
Low voltage out of Genset - Alan - 08-21-2006, 16:18
Low voltage out of Genset - Curt Sprenger - 08-22-2006, 03:14
Low voltage out of Genset - Pete Masterson - 08-22-2006, 04:37
Low voltage out of Genset - Wilhelmus Schreurs - 08-22-2006, 05:02
Low voltage out of Genset - one_dusty_hoot - 08-22-2006, 06:47
Low voltage out of Genset - one_dusty_hoot - 08-22-2006, 07:06
Low voltage out of Genset - John Suter - 08-22-2006, 09:58
Low voltage out of Genset - Bruce Morris - 08-22-2006, 15:28
Low voltage out of Genset - one_dusty_hoot - 08-22-2006, 15:39
Low voltage out of Genset - Alan - 08-22-2006, 16:38
Low voltage out of Genset - John Suter - 08-22-2006, 23:20
Low voltage out of Genset - one_dusty_hoot - 08-23-2006, 03:56
Low voltage out of Genset - pattypape - 08-23-2006, 05:18
Low voltage out of Genset - Ralph L. Fullenwider - 08-23-2006, 05:34
Low voltage out of Genset - The Squires - 08-23-2006, 05:36
Low voltage out of Genset - Alan Johnson - 08-23-2006, 06:34
Low voltage out of Genset - John Suter - 08-23-2006, 06:42
Low voltage out of Genset - Stephen Birtles - 08-23-2006, 06:52
Low voltage out of Genset - erniecarpet@... - 08-23-2006, 08:06
Low voltage out of Genset - Alan Johnson - 08-23-2006, 08:31
Low voltage out of Genset - one_dusty_hoot - 08-23-2006, 10:30
Low voltage out of Genset - one_dusty_hoot - 08-23-2006, 12:31
Low voltage out of Genset - Gardner Yeaw - 08-23-2006, 12:37
Low voltage out of Genset - Wilhelmus Schreurs - 08-23-2006, 17:58
Low voltage out of Genset - John Suter - 08-24-2006, 03:58
Low voltage out of Genset - Alan Johnson - 08-24-2006 16:14
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