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Introduction
Diesel generator control systems are equipped with various fault indicators to ensure safe and efficient operation. These indicators alert users to potential issues such as voltage fluctuations, frequency anomalies, and other critical faults. Understanding these fault signals and their corresponding troubleshooting measures is essential for maintaining generator performance and preventing unexpected shutdowns.
Warning and Alarm Indicators
1. Under-Frequency Warning
Trigger Condition: When the generator frequency falls below the preset under-frequency threshold.
Response: The control module issues a warning signal.
2. Over-Voltage Warning
Trigger Condition: When the generator voltage exceeds the preset over-voltage threshold.
Response: The system generates a warning signal to alert the operator.
3. Under-Voltage Warning
Trigger Condition: When the generator voltage drops below the preset under-voltage threshold.
Response: The control module activates a warning signal.
4. Over-Current Warning
Trigger Condition: When the generator current surpasses the preset over-current threshold with a warning action type selected.
Response: The control system issues a warning signal.
5. Battery Over-Voltage Warning
Trigger Condition: When the battery voltage exceeds the preset threshold.
Response: The monitoring system triggers an alarm.
6. Battery Under-Voltage Warning
Trigger Condition: When the battery voltage falls below the preset threshold.
Response: The control panel activates a warning signal.
7. Reverse Power Warning
Trigger Condition: When the generator’s reverse power (negative capacity) exceeds the preset threshold with a warning action type selected.
Response: The control panel issues a warning signal.
8. Over-Capacity Warning
Trigger Condition: When the generator’s power (positive capacity) exceeds the preset threshold with a warning action type selected.
Response: The control module generates a warning.
9. Low Temperature Warning
Trigger Condition: When the detected temperature falls below the preset low-temperature warning threshold.
Response: The monitoring system triggers a warning.
10. Low Oil Pressure Warning
Trigger Condition: When the detected oil pressure falls below the preset threshold.
Response: The control panel generates a warning alarm.
11. Low Fluid Level Warning
Trigger Condition: When the detected fluid level is below the preset threshold.
Response: The controller issues a warning signal.
Shutdown Alarm Indicators
12. Under-Speed Shutdown Alarm
Trigger Condition: When the generator speed falls below the preset under-speed shutdown threshold.
Response: The control panel issues a shutdown alarm signal.
13. Zero-Speed Detection Alarm
Trigger Condition: When the generator speed is detected as zero and the speed signal is lost.
Response: The monitoring system triggers a shutdown alarm.
14. Over-Frequency Shutdown Alarm
Trigger Condition: When the generator frequency exceeds the preset over-frequency shutdown threshold.
Response: The control module issues a shutdown alarm.
15. Under-Frequency Shutdown Alarm
Trigger Condition: When the generator frequency drops below the preset under-frequency shutdown threshold.
Response: The control system generates a shutdown alarm.
16. Over-Power Shutdown Alarm
Trigger Condition: When the generator power (positive power) surpasses the preset threshold with a shutdown action type selected.
Response: The control panel triggers a shutdown alarm.
17. High-Temperature Shutdown Alarm
Trigger Condition: When the detected temperature exceeds the preset shutdown threshold.
Response: The control module triggers a shutdown alarm.
18. Low Oil Pressure Shutdown Alarm
Trigger Condition: When the detected oil pressure drops below the preset shutdown threshold.
Response: The control panel issues a shutdown alarm.
19. Sensor Low-Value Shutdown Alarm
Trigger Condition: When the detected sensor value falls below the preset shutdown threshold.
Response: The control interface generates a shutdown alarm.
20. Custom Input Shutdown Alarm
Trigger Condition: When a user-defined input is set as a shutdown alarm and the input becomes active.
Response: The control system issues a corresponding shutdown alarm.
21. Ground Fault Shutdown Alarm
Trigger Condition: When the detected ground fault current exceeds the preset threshold with a shutdown action type selected.
Response: The control interface triggers a shutdown alarm.
22. Current Imbalance Shutdown Alarm
Trigger Condition: When the detected imbalance current exceeds the preset threshold with a shutdown action type selected.
Response: The control panel generates a shutdown alarm.
23. Loss of Excitation (Demagnetization) Shutdown Alarm
Trigger Condition: When the generator’s reactive power (negative reactive power) surpasses the preset threshold with a shutdown action type selected.
Response: The control system triggers a shutdown alarm.
24. Circuit Breaker Trip Shutdown Alarm
Trigger Condition: When a trip alarm signal is detected.
Response: The control panel immediately disconnects the generator output and shuts down the system after high-speed cooling.
25. Over-Current Trip Shutdown Alarm
Trigger Condition: When the generator current surpasses the preset over-current threshold with a trip shutdown action type selected.
Response: The monitoring system triggers a trip shutdown alarm.
26. Maintenance Reminder Shutdown Alarm
Trigger Condition: When the maintenance countdown reaches zero and the maintenance action type is set to trip shutdown.
Response: The control panel issues a trip shutdown alarm.
27. Reverse Power Trip Shutdown Alarm
Trigger Condition: When the generator’s reverse power (negative capacity) exceeds the preset threshold with a trip shutdown action type selected.
Response: The controller triggers a trip shutdown alarm.
28. Trip Alarm Without Shutdown
Trigger Condition: When a trip alarm signal is detected but configured not to shut down the generator.
Response: The monitoring system disconnects the generator output while keeping the generator running.
Conclusion
Understanding these warning and shutdown indicators is crucial for ensuring the optimal performance of diesel generators. Regular monitoring and timely maintenance can help prevent major faults and extend the lifespan of the generator system. Operators should familiarize themselves with these signals and take immediate corrective actions when needed.
