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Diesel 3 phase 100 Kva electric generator shuts down?

I have a Diesel generator using leroy sommers alternator and which uses intelilite MRS 11 controller , it is 380 V , 50 Hz , yesterday i started having problems , after running the genset for like 12 seconds it shuts down and i get two error msgs the first one is : Shutdown Level for Phase 1 under volts the second error msg is : Shutdown Level for Gen voltage Unbalance . in the first 12 seconds the voltage on 3 phases got no problem and after 12 seconds the generator auto shuts down and i cannot seem the find the problem , any help will be appreciated

Public Comments

1. Its seems ur AVR circuit circuits not functioning or mal functioning check all glass fuses & relays ( coil & contacts of pcb mounted miniature relays ) healthines in AVR PCB isn't open type or sealed type ?,. Check all input plugs & connection to speed sensor too.voltage monitoring relay should pick up (AVR pcb). go thro the manual if there any , what is the climate is ti too Humid chill & windy , Is ur Generator is fitted out side or inside building ? some time certain environment AVR circuit may mal function , some time there won't be a fault at all .once after checking all those points -try again best of Luck - or pm me
2. Having unbalanced voltage will surely shut down your system, or it will destroy any load you put in the system. Have a look on the rectifier or voltage regulator section of your alternator.These might need a change. The 12 secs is just a time delay before giving out error message.
3. As a rule of thumb, the first alarm is the one which triggers the rest, so, concentrate on that one. If you have only one phase with a low voltage alarm, a) there is a short somewhere on that phase. Check the phase currents before shut down. If everything looks ok , probably a generator winding is shorted. b) Check the phase voltages before shut down, if everything looks ok, the relay is faulty, have it checked. -