Reasons for No Output in AC Diesel Generator

1. Faulty AVR (Automatic Voltage Regulator): The AVR fails to supply or control the DC current needed to create the rotor's magnetic field.

2. Brush/Wearing Issues (if applicable): Worn-out, stuck, or dirty brushes prevent excitation current from reaching the rotor.

3. Failed Rotating Diodes (if applicable): Diodes in the rotating rectifier assembly burn out (open or short circuit), disrupting the DC supply to the rotor.

4. Broken or Loose Wiring: Faulty connections in the excitation circuit, main stator output, or between the AVR and components.

5. Stator or Rotor Windings: Open or short circuits in the main power windings or the excitation (field) windings.

6. Engine Speed (RPM) Too Low: The engine must reach rated RPM to generate the required frequency for the AVR to operate correctly.

7. Loss of Residual Magnetism: The rotor's tiny magnetic field is lost, so the excitation process cannot start.