Sorry folks .
After many a trials it was finally found that the rubber coupling between the gear box and the shaft generator was the problem. Though it did not show any signs of wear , aging or damage.
The coupling from another engine was swapped to this engine and the system is performing...
Good Day,
The frequency is 100mm/s RMS.
The Generator vibrates without any excitation at rated speed.
The vibrations increase on loading the generator.
Could an earlier botched up alignment and chocking job be the reason. This job was later done by professionals but this never worked?
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...
