Hi folks,
I just acquired a generator, which seems mostly good, at least it is after a new fuel tank and filter...
I am a control tech, with a reasonable grasp of things mechanical, but I know nothing about Lister Petter engines, beyond the very basics of small diesels.
The unit I have has stood for years, probably hasn't run in at least 3 and wasn't doing much of anything useful for several years prior to that!
Oil was changed, don't know about the oil filter, will deal with that as soon as I work out what filter element I need.
In tank fuel filter badly clogged, tank dirty. Fitted external tank added can and bowl filter, both of which seem fine.
Engine a bit smoky generally, worse above 50% load, looks like incomplete combustion, rather than oil burn. Not dramatic, Running injector cleaner right now and it seems to be cleaning up slowly.
I will take all the help and or advice I can get but the primary reason for this post is to ask about governor adjustment...
The set seems to run pretty well but the governor is sluggish, at best.
When the load changes quickly, microwave cycling or kettle turning off for example, so a 2kW drop in the latter case, the RPM is climbing quickly.
At start-up the Frq is good, about 51Hz.
Applying 3.5 to 4kW of load drops the Frq by 2-2.5 Hz, less than ideal but not a huge issue.
However when the load is suddenly reduced, significantly, the Frq climbs quickly, which trips my chargers and dumps all the load...
This results in the engine running way to fast, circa 55.5Hz which then slowly, over a minute or so, falls back 44Hz at which point the inverters reconnect, ramping in the load over 30S or so and pulling the Frq back to circa 49Hz.
Small changes, less than 25%$ of applied load seem to be handled reasonably and for a reasonably consistent load the Frq/RPM is remarkably stable.
I don't know how close the governors RPM control should be, but this amount of change seems excessive to me so I have questions...
How much variation should I expect when adding or removing load?
If I am seeing more than there should be, how would I go about adjusting that, or tracing whatever part isn't working?
Any and all help will be much appreciated, even if that involves telling me I am missing a point or being silly, Absolutely no clue about pretty much anything right now.
Thanks in advance,
Al
