Tony Wells
Senior Member
I was merrily testing my converted trommel yesterday, and after a few minutes, the machine (one 60hp-480/60/3 ()on a soft start unit) pump drive motor, and a 3/4 hp cooling fan motor), everything got quiet. I did not have the machine actually in action, just the pump and fan running. After about 10 minutes, the genset just went dark. Cummins power never blinked and starts/runs fine. Just won't make any power. Any phase. Well, I can get 25 volts or so across the 480 buss. Three are three fuses in the load sense circuit that are good, the main breaker did not trip, there is one 8 amp fuse on the AVR board....all good. It had not the time to get hot. I have run this setup for about 40 hours in the last few weeks without issue.
The only help the troubleshooting section of the manual offers is to polarize the windings which may have lost the residual magnetism. Can't be that, it quit generating while operating normally. I've seen that on older units after they set unused for a long time.
Sooo, looking for ideas on where to start digging. I can't see dropping a main winding taking all three phases out but not checked yet. Can't imagine losing an exciter diode with no load. I do have the original books, with diagrams, they are just lacking any how-to-get-to-it and component locations. I know where the AVR board it, but no testing info.
Any volunteers?
The only help the troubleshooting section of the manual offers is to polarize the windings which may have lost the residual magnetism. Can't be that, it quit generating while operating normally. I've seen that on older units after they set unused for a long time.
Sooo, looking for ideas on where to start digging. I can't see dropping a main winding taking all three phases out but not checked yet. Can't imagine losing an exciter diode with no load. I do have the original books, with diagrams, they are just lacking any how-to-get-to-it and component locations. I know where the AVR board it, but no testing info.
Any volunteers?