This 1800 RPM/ 1000 KW/440V/60Hz generator driven off a marine engine through a gear box started vibrating after 5 years in operation. Runs perfectly well on a test bench , the engine and gear box too work well without being connected to the generator. But as soon as the shaft generator is connected the vibrations are in excess of 100mm/s.
Since this is a floating vessel other changes on the deck , for example heavy loads added and removed at intervals do continue.
Suggestions welcome. Thanks
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