Generator producing excess AC voltage

[ex-12m-guy]

Full link will not copy. It is a link to a PDF file. I got there by searching on duckduckgo.com with the generator name and model number. Look for the results below and then click in the included link to download the manual.


Installation, Service & Maintenance Manual - Diesel Generator

this generator manual and become familiar with it and the equipment. ... Markon generators are manufactured to Q.A. procedures ... BL105E SL105E BL105F SL105F
hardydiesel.com/generator-ends/dl/markon-generator-manual...

[ex-12m-guy]

Here is the complete link to the alternator manual:

hardydiesel.com/generator-ends/dl/markon-generator-manual.pdf

[ex-12m-guy]

If you depend on an AC genset to provide the comforts
of home aboard, and you cruise the boonies, I recommended
carrying the following spare parts:

AVR (automatic voltage regulator circuit board.)

Several sets of fuses for the AVR. They are often non-standard and hard to find

A complete set of diodes. (Depending on the style of the alternator, these may be
individual, or in sub-assemblies named "suppressor diodes" "diode ring" etc.)

Capacitors, if your alternator includes them. (Many larger alternators do not use caps.)

Given these parts, a shade tree mechanic / electrician can usually revive a dead
alternator.

[deblen]

I have had a Briggs & Stratton Sirometer for many yrs-way before inexpensive digital freq meters,etc.
Works very well,simple & inexpensive RPM or Vibration measurements.

Made by a company called Treyfit

Briggs & Stratton Tachometer - 19200

Cheers/ Len

[GrahamW]

Cds2, Ex 12Mguy and Deblen,
Thanks for all your very helpful replies. Will report back once I have carried out further investigations.
G

[GrahamW]

Dear all,

This is by way of a report back following my further investigations.

I confirmed the frequency was ok and then monitored the output voltage under various scenarios :

- No load it fluctuated between 270 -280V.

- Turning on the Mastevolt charger had no effect, presumably because it recognised the input voltage was outside the acceptable range.

- Turning on the water heater brought the voltage down to a more steady 220V.

- With the water heater heater turned on it was then possible to successfully run the charger and the voltage remained very steady at 220V.

-The charger then continued to run even if the water heater was turned off, with the voltage remaining steady at 220 - 230.

Note that the voltages above were taken using the analogue meter installed on the boat - it appeared to under read by about 10V when compared to testing with a digital meter at the generator output.

With a photo tachometer I found that the revs were at 3230 RPM as as opposed to the 3000 the manual called for. I thought that was not far off and was unlikely to be the cause of the problem......

I then put in a new capacitor, but with no effect.

So I then started to alter the RPM by adjusting the throttle lever which was previously fixed in place. I found that a relatively small change in RPM had quite a big impact on the voltage. I eventually fixed the RPM at 3150 which produced an output of 240V with no load, which dropped under load to a steady 230V.

I´m going to run it over the next few days to see if anything changes, but am hopeful that the issue is fixed.

But If anybody thinks that I have missed something or that I´m being too optimistic then please let me know!

Thanks,

Graham

[Sailmonkey]

Your frequency cannot be ok if your engine was/is running 250 rpm faster than spec.


Sent from my iPhone using Cruisers Sailing Forum

[zengirl]

Sorry, could not find right thread for this. I am thinking of spending the winter up north. Would this heater work for me? Bristol 30'

Buy the Dyson Hot+Cool - dyson.com‎
Adwww.dyson.com/Heaters‎
3.9
rating for dyson.com

Thanks for all input. I have no idea if I hijacked a thread, where this will show up. It says "new post" but it's just posts that have been posted. And I can't see where it says "new thread" and if I do a search on "heaters" everything but the kitchen sink comes up, but not heaters, so once again, I apologize.