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marksman diesel generator power loss ?

using this on 240 volts this afternoon, all OK. Restarted it as usual, no power, circuit breaker tripped. reset this and engine laboured heavily (no load on circuit) and smoked as though under heavy load. No visible signs of short circuits etc could be found! Generator works perfectly at 115 volts, switch to 240 v and the same fault occurs. Anyone have any ideas? Thanks
Dave, July 2009
Suspect short on 1 winding to earth. Tests with insulaton test unit (Megger) would confirm

JH, November 2009
As the engine labours, it is finding the generator very hard to turn. As the trip has fired, it would indicate a fault to earth on the 250 volt generator windings.

John, July 2009