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Participant

Join Date: Aug 2012
Posts: 1

Diesel Engine Generator Trip On Overspeed

08/12/2012 12:59 PM

Hi, I had a problem with my 1000kVa diesel engine generator whereby it had tripped on overspeed alarm. The generator was previously tested fine but after we relocate to different location and connect with new diesel supply the problem occur. Before the generator down it was hunting. Could it be because of air lock or diesel contaminated? FYI, the diesel supply previously was used for another unit of diesel engine generator and nothing wrong with it. Appreciate your expertise to help me to solve this problem.

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Guru

Join Date: Oct 2008
Posts: 42290
Good Answers: 1662
#1

Re: Diesel engine Generator trip on overspeed

08/12/2012 1:04 PM

Make a list of everything that has changed.

Check each variable, one at a time, until you have checked everything on the list.

Call the service tech and have him come fix the problem. Save the list for him.

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Guru

Join Date: Jun 2010
Posts: 1296
Good Answers: 102
#2

Re: Diesel Engine Generator Trip On Overspeed

08/12/2012 3:01 PM

Bleeding the injectors should be easy enough, but I don't think that's the problem.

Check the throttle/governor linkage for binding or slack. Did anything get damaged or bent in the move? Is this the only generator on this line?

How much and what kind of load was on the generator when it triipped?

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Active Contributor

Join Date: Apr 2007
Location: Los Angeles, CA
Posts: 19
#3

Re: Diesel Engine Generator Trip On Overspeed

08/12/2012 10:42 PM

Check the memory in the speed switch for the time/date stamp and rpm of the overspeed condition.

This will allow you to focus effort when the operating condition occured.

I support the govenenor linkage condition being a prime culprit

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Guru

Join Date: Aug 2010
Location: Melbourne, Australia
Posts: 740
Good Answers: 24
#4

Re: Diesel Engine Generator Trip On Overspeed

08/12/2012 11:53 PM

Perhaps one of your fuel connections is not nipped up tight and it is sucking some air with the fuel.....

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Participant

Join Date: Jul 2012
Posts: 1
#5

Re: Diesel Engine Generator Trip On Overspeed

08/13/2012 2:43 AM

Hi,

If your engine generator have controled intergaretion so you should check memory again.

other you should check the governor linkage. it happen when you move the engine.

Thanks.

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Commentator

Join Date: Apr 2009
Posts: 94
Good Answers: 3
#6

Re: Diesel Engine Generator Trip On Overspeed

08/13/2012 12:56 PM

What is the make of the governor control and actuator?

Is the governor control the same one that contolled another unit?

What is the make and model of the engine?

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Participant

Join Date: Aug 2012
Posts: 3
#7

Re: Diesel Engine Generator Trip On Overspeed

08/13/2012 3:27 PM

Your issue will be either in the linkage or it is the govenor on your unit. Some (govenors) are electric over mechanical, so it could be just a bad connection. "Hunting" is a sign the govenor is bad or has a problem within that individual circuit.

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Guru

Join Date: Jun 2009
Location: Ontario Canada
Posts: 930
Good Answers: 31
#8

Re: Diesel Engine Generator Trip On Overspeed

08/13/2012 6:32 PM

Most of my success with governor controlled engines hunting was bad bearings in the governor assuming this unit has a mechanical governor. Also check to see if the generator load is consistent. Binding linkage can also be the culprit so check carefully and lubricate each joint of the linkage.

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