Service Manual

7. Troubleshooting 10-2019
152 A062J683 (Issue 1)Copyright © 2019 Cummins Inc.
5. Remove connector P1 from the control and re–install it, and then start the
generator set.
6. Verify that the P1 pin socket is fully inserted and inspect the pin socket
condition for corrosion and acceptable condition of contact wipers. To check
contact wipers, use one of the devices below:
• A mating pin connector
• A pin gauge the same size as the mating control connector pin (0.045 in)
• Any suitable device that will not damage the inside contact wipers of the
pin socket
If necessary:
• Clean, repair or replace the pin socket.
• Fully insert any partially inserted pin socket.
7. Inspect the condition of the P1 pin on the control board. If it is damaged or
severely corroded, clean or repair if possible, or replace the control board.
8. When reconnecting the harness plug to the connector, ensure that the pair are
fully seated next to each other.
9. Measure field, quadrature and main winding resistance.
• Clean the slip rings, replace the brushes, repair the harness, and replace
the rotor and stator assembly if necessary.
10. Check brush alignment:
a. Inspect brush wear on the slip rings and verify brush misalignment is
toward the windings.
b. If misalignment is toward the bearing, the cause is not a tolerance issue,
but is more likely the result of the end bell not being seated properly during
assembly.
• Inspect for cause and repair if necessary.
11. Check the governor actuator, actuator linkage, and throttle shaft for free smooth
motion without stop. Verify that the actuator is opening the throttle while
cranking.
Code 14 - Overfrequency
Logic:
• Instantaneous Fault: Frequency greater than 72 Hz
• Delayed Fault: Frequency greater than 66 Hz, but less than 72 Hz, for 6
continuous seconds
Possible Causes:
• Generator set loads
• Engine governor function
• Fuel supply