suggestion for controlling vibration of DG set.

Really need more info...

Have you taken in vibration data? Is it on the engine side or the generator side? What aspect or part of the machine is the vibration noticable on? It is fine on full load, bad at 50%, how is it at no load? Anything broken? Motor mounts in good shape?

What Vibrations are you getting??

Vibrations within the Generator Set or Vibrations through the Building Structure??

The first could be caused by Broken Mounts etc mentioned previously.

The Vibrations through the Building are quite ofter caused but Harmonics where the Genset Vibrations resonate with the building at a given point.

You need to identify what Vibrations you are getting before you get to far find you are chasing a non-existant mechanical problem.

Regards
Sapper

From my experience , broken mounts or resonance are the culprit.

A 200KVA is a relatively small machine.

Verify the spped at 505 load and confirm if the governor is holding the speed the same at 100% load.

If not and you can shift the speed at 505 to match the speed at 100% this will eliminate the suspicion that it is a speed resoannce at the 50% load.

saw it happen many times .

Even saw an output terminal box with slack bolts cause a partial load resonance but that was on a 1.5MVA man B&W.

last titbit, if the machine was ruunning fine all along then even if it tis resonance , something has changed.

broken mounts , loose anchor bolts, does the machine have a "soft leg"?

Is it puffing any smoke at part load? If it is maybe a bad injector is to blame. I suggest you get the engine manufacturer to perform a PM clinic on the engine, it could save bigger expense.

Thanks for your comments.it is giving more smoke at the start only.planning to check injectors and then calibration of the injection pump.your valuable comments are welcome.

I would go with the Bad injectors,causing the vibration line of thought.

cheers