Diesel 3 phase 100 Kva electric generator shuts down?

Question

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

Answer 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

Answer 2

Depends on the local rules. Power companies don't care, since once he is cut off he will not be back feeding the line. We've had a few people around here do it, including several who were far enough from the powerlines that it would have been prohibitively expense to hook them up. I just want to add that if you live in a cold climate and set yourself up to utilize the waste heat from the generator, the cost of fuel and generator may be cheaper than paying for electricity and heat together, even assuming you have to buy a replacement generator every year. If you add in appropriate alternate energy, while using the bottom line as your decision driver, you may cut your costs over conventional sources. Depends on how you do it.

Answer 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.
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Answer 4

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.