1906
UnclassifiedElectrical
What This Code Means
Generator Shuts Down for Under Voltage; Prolonged Undervoltage; Generator voltage below 80% of nominal for 10+ seconds.; Both Zero Crosses missing Undervoltage; Controller measuring no voltage resulting in undervoltage; Generator voltage less than 120V when undervoltage set; No field current during undervoltage alarm; Generator running underspeed for > 30 seconds when under - voltage alarm set; Single Zero Cross missing Undervoltage; After resuming from a load shed event, still undervoltage because of overload condition.; Generator Xfer Enabled Output has been mis - wired.; Incorrect DC AC wiring hook up.
Possible Causes
- •Faulty Main Circuit Breaker
- •Faulty Fixed Excitation Circuit
- •Faulty Rotor Insulation Resistance
- •Faulty Regulator Output
- •Faulty AC Sensing Circuit
- •Faulty Brushed Rotor Assembly
- •Faulty Stator
- •Faulty DPE Breaker
- •Faulty DPE Circuit
- •Faulty Flash Wiring
- •Faulty DB1 Diode
- •Faulty DB2 Diode
- •Faulty Wire 14 Field Flash Circuit
- •Faulty Field Flash Circuit
- •Faulty Controller
- •Faulty Stator (when Rotor is good)
- •Faulty Rotor (when Stator is good)
- •Faulty Rotor and Stator
- •Faulty Wire 14 (after tests indicate bad)
- •Brushless Alternator Problem 5 – Generator Shuts Down for Under Voltage page 57
Suggested Actions
- 1Test Main Circuit Breaker
- 2Test Fixed Excitation
- 3Perform Rotor Insulation Resistance Test
- 4Test Regulator Output
- 5Test AC Sensing Circuit
- 6Test Brushed Rotor Assembly
- 7Test Stator
- 8Test DPE Breaker
- 9Test DPE Circuit
- 10Test Flash Wiring
- 11Test DB1 Diode
- 12Test DB2 Diode
- 13Test Wire 14 Field Flash Circuit
- 14Test Field Flash Circuit
- 15Replace Controller
- 16Replace Stator Only
- 17Replace Rotor Only
- 18Replace Rotor and Stator
- 19Repair or Replace Wire 14
- 20Repair or Replace Rotor
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