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Tested one of our generators this morning, only about 76KW engine set. Started up fine, took the load of the building fine, connected a load bank, fine. Voltage readings all 240ish, temperature as expected, oil temperature as expected, coolant temperature as expected. 1.5hours later. Chug chug chug. Generator fails. Switches back to mains supply.
Fault on genny is “alternator volts fail”.
My first instinct is failed AVR. Runs genny again off load, readings are 240,241,242v (3phase obviously). So now what? Lol.
Possibly a faulty alternator? Is it worth checking the stator winding? I’m electrically biased and my mechanical knowledge is basic I’ll prewarn you. Thanks in advance.
 
Does the standby set have any bushes that may be worn down to far and not making contact on the alternator slip rings?
 
Like I have said hundreds of times here, the Jocks are constantly pi$$ed lol, say no more pmsl
 
‘Chug chug chug’ to me suggests that maybe the engine has an issue maybe fuel filter or the water separator hasn’t been emptied in a while.
Ah yes Dave, couldn't really be electrical, if the Prime mover is playing up, fuel problems, injectors blocked, filter blocked, over heating, needs a diesel Mechanic to have a butcher I would think.
 
Sounds like a engine side failure. Because of the alternater fault I would check all the electrical connections related to it. If it is a stand by set I’m guessing the trickle charge set up will replenish the battery’s and perhaps hide the altonator fault if it’s only ran for short periods
 
Sounds like a engine side failure. Because of the alternater fault I would check all the electrical connections related to it. If it is a stand by set I’m guessing the trickle charge set up will replenish the battery’s and perhaps hide the altonator fault if it’s only ran for short periods
Yes mate it’s a standby set. 24v starter battery which is charged via a 24v rectifier (from the engine control cab).
I see what you’re saying though.
 
Ah yes Dave, couldn't really be electrical, if the Prime mover is playing up, fuel problems, injectors blocked, filter blocked, over heating, needs a diesel Mechanic to have a butcher I would think.
I think that’s a good idea checking the fuel filters etc. It’s in a remote area and probably runs for around 4-5 hours a year, if that
 

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