（3） Shutdown
1. After the mains power is normal, gradually cut off the load and disconnect the main switch (low-voltage air switch) of the generator unit.
2. Gradually reduce the speed to idle under no-load condition, and stop the engine when the water and oil temperature of the diesel engine drops below 70 ℃.
3. Disconnect the startup control power supply and close the isolation knife switch to the mains position in the order of operation.
