Various type of shaft driven generating system has been applied on board to save maintenance cost as well as save fuel cost.The mainstream of such system with large capacity is the one with load commutated inverter system. By adding‘Fault Diagnosis Function’ derived from‘Direct Digital Control’ and‘Graphic Display Function’ utillizing recent micro electronic technology, MTTR (Mean Time To Reopair) has been shortened.We have developed a Direct Digital Controlled Shaft Driven Generating System that adopts above technology first in japan. Aiming increased Reliability, Availability and Serviceability and delivered the first product in Oct. '95.