5-6
Table 5-3. Troubleshooting Chart
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. VOLTAGE DOES NOT BUILD UP TO RATED VALUE.
Step 1. Check for low residual voltage and/or incorrect polarity relationship between exciter
output and generator field.
If either condition exists, flash the generator field.
If neither condition exists, proceed to Step 2.
Step 2. Verify that the Voltage Shutdown Switch is closed.
If the Voltage Shutdown Switch is open, close the switch.
If the Voltage Shutdown Switch is closed, proceed to Step 3.
Step 3. Verify that the prime mover is operating at rated speed.
If the prime mover is not operating at rated speed, adjust speed.
If prime mover is operating at rated speed, proceed to step 4.
Step 4. Incorrect or missing voltage at regulator power input terminals (3 & 4).
If this condition exists, repair wiring.
If this condition does not exist, proceed to step 5.
Step 5. Verify regulator output voltage at terminals F+, F-, and A-.
If voltage is incorrect or missing, repair wiring and/or adjust/repair regulator.
If voltage is correct, proceed to step 6.
Step 6. Verify that generator output is neither shorted nor overloaded.
If generator output is shorted, remove short and repair wiring.
If generator is overloaded, shed excess load.
If generator output is not overloaded or shorted, proceed to step 7.
Step 7. Verify that the External Voltage Adjust Potentiometer (R1) is properly wired.
If the External Voltage Adjust Potentiometer is incorrectly wired, reconnect wiring
properly.
If the External Voltage Adjust Potentiometer is correctly wired, proceed to step 8.