Diesel Generator Problem
Diesel Generator Problem
(OP)
I have a 60hz 208v generator powered by a 371 cummins diesel. When I got it the DC power wire from the solenoid to the control box was badly burned. I replaced the DC breaker and rewired the bad wire. It was built in 1969 by Condec Corporation. It runs great but I cant control the voltage. I can govern it down and control the hz and the voltage adjusts comparably. The only problem is that I cant get 60 hz and 208v at the same time. The voltage adjust reostat has no affect. It checks out with an ohms meter. Could this be a voltage regulator problem? Any help would be great thanks.....Troy






RE: Diesel Generator Problem
ie: Engine controls?
AC/DC boards?
Are the 12 leads acurately flagged?
RE: Diesel Generator Problem
Regards
Khalid Khan
RE: Diesel Generator Problem
The voltage is controlled by field current.
You didn't mention whether the output voltage was too low or too high.
If it is too high then the field current is too high and if the voltage is too low the field current is too low.
The voltage regulator controls the field current.
The problem is likely to be a damaged VR.
RE: Diesel Generator Problem
RE: Diesel Generator Problem
I assume you want to ensure 208V on load, right ?
In this case, it is not unusual to have an off load voltage slightly higher (there is ususlly a 5% difference on transformers for instance...).
RE: Diesel Generator Problem
RE: Diesel Generator Problem
RE: Diesel Generator Problem
2. Assuming that you need an approximately full rated kW of the alternator, one way to implement it is over the Alternating Current (3-phase) to Direct Current to Alternating Current (1-phase) energy conversion. Another way to do it is over the connections of windings. This may need the alternator rewiring from 3-phase to 1-phase. An assessment of both approaches is needed to select the better one.
1. Reliability works in favor of 2nd
2. Cost is to be analyzed
3. Power quality works in favor of 2nd
4. If you happen to need the 3-phase power for some reason, the 1st option leaves some room for it
5. Etc.