Service Manual

7. Troubleshooting10-2019
151A062J683 (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.
Code 13 - Undervoltage
Logic: AC voltage 240 line-to-line is less than 216 VAC for 5 continuous seconds
Possible Causes:
• Generator set loads
• Wire connections
• Alternator windings
• Generator set overload
• Governor
Diagnosis & Repair:
1. Check the last fault recorded.
• If this fault has not been repaired, troubleshoot that fault.
2. Measure and verify the AC voltage at the generator set circuit breaker and at
pins P1-34 and P1-35.
3. Cycle loads to determine if a particular load will cause fault.
• Diagnose faulty load if necessary.
4. Verify balanced loads in 120/240 VAC applications.
• Balance loads within 10% line-to-line as required.