Low voltage out of Genset
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08-23-2006, 10:30
Post: #21
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Low voltage out of Genset
Fluke is good. Well maybe you have gone about
as far as you can without detailed instructions. I looked at what information I had on the Onan 8.0 DKD for troubleshooting to see if there was anything there that might help you, NADA! Might very well be the printed circuit board. I would NOT adjust the transformer taps. Bob Janes '87FC35 Greenville, SC --- In WanderlodgeForum@yahoogroups.com, "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" > > > > > > > > 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] > |
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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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