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Diesel Generator AUTO Mode: Step by Step Startup & Shutdown Procedure

Introduction
A diesel generator (DG) is an essential backup power source that automatically activates during grid failures, ensuring uninterrupted electricity supply. Operating a DG in AUTO mode simplifies the process by enabling automatic startup and shutdown based on power availability. Understanding the correct starting and stopping procedures ensures efficient performance, prevents malfunctions, and enhances the generator’s lifespan.
Starting procedure for Diesel Generators in "AUTO" mode
Follow these steps to start a diesel generator in AUTO mode:
  • Check Emergency Stop Switch: Ensure the Emergency Stop switch on the DG panel is in the released (off) position.
  • Set Selector Switch to "Remote" Mode: Switch the DG panel selector to "Remote" mode.
  • Set ACB to Remote Mode: Ensure both the DG and EB Air Circuit Breakers (ACB) are set to "Remote" mode on the Main Distribution Board (MDB).
  • Verify Lube Oil Level: Check that the lubrication oil level is within the acceptable range to prevent engine wear.
  • Check Diesel Level in Day Tank: Ensure the diesel level is above 75% for uninterrupted operation.
  • Ensure Proper Cooling:
    • Radiator water should be filled to the brim to prevent overheating.
    • Verify that the cooling system is functioning properly.
  • Confirm Battery Status: Ensure the batteries are fully charged to provide reliable starting power.
  • Automatic Startup:
    • If the Transformer Circuit Breaker (CB) trips or if the main power supply fails, the DG will start automatically.
  • Monitor Generator Parameters: Once the DG is running, check the following essential parameters:
    • DG Output Voltage
    • Load Current
    • Frequency
    • Water Temperature
    • Lube Oil Pressure
    • Battery Voltage
    • Day Tank Diesel Level
Stopping procedure for Diesel Generators "AUTO" mode.
When the main power supply is restored, the diesel generator will automatically shut down as follows:
  • Automatic Transfer to EB Supply:
    • When the Electric Board (EB) power resumes, the ACB automatically closes, transferring the load to the main power supply.
  • DG Breaker Opens:
    • The DG breaker opens automatically, disconnecting the generator from the load.
  • No Load Running for 60 Seconds:
    • The DG continues to run without load for 60 seconds to cool down.
  • Automatic Shutdown:
    • After 60 seconds, the DG switches off automatically to complete the shutdown process.
Final Words
Following these standard operating procedures ensures a smooth, safe, and efficient diesel generator operation in AUTO mode. Regular monitoring and maintenance of the system help prevent power disruptions and prolong the generator's lifespan. By understanding these steps, users can maximize the reliability and performance of their diesel generators in critical situations.

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