After the diesel exhaust control system starts working, the PLC first executes the CPU self-diagnosis program. If the CPU fails, the PLC displays the fault signal and the system stops working. If the system self-test is normal, the PLC executes the main program of the control system in sequence, initializes the system parameters, resets the initial frequency of the three inverters to zero, and detects the working state of the EM235 analog input module, and gives the normal working signal of the module. When the system performs the second scan cycle or the system is in the standby state, the system no longer executes the initialization subroutine, only judges whether the intermediate parameter of the inverter is in the normal frequency range of the inverter, and if it exceeds the upper and lower limits of the frequency, it is automatically set to The value of the upper and lower limits. In the automatic mode, after the system is started, the PLC compares the measured value of the differential pressure sensor with the set value, first determines the differential pressure across the secondary heat exchanger, and if the differential pressure across the secondary heat exchanger does not exceed the set value, the secondary One heat exchanger is heat exchanged and the other is de-iced. When heat exchange, first open the inlet fan, after 5s delay, 12 electric valves work, open the air inlet and exhaust channels, start the diesel generator set at the same time, the system controls the inverter fan to automatically convert according to the external environment and the temperature difference of the exhaust port. When the difference between the fresh air temperature and the exhaust gas temperature exceeds the specified value, the alarm indicator lights up and the system is still in operation. Two differential pressure sensors detect the pressure at both ends of the heat exchanger in real time and automatically switch the heat exchanger. If the pressure values ​​of the two differential pressure sensors are greater than the set value, the alarm indicator lights up, press the stop button, all the electric valves are opened, the inlet and exhaust fans and the water pump are turned off, and the system stops running. On grid solar system,Microgrid power system,outdoor energy storage cabinet,renewable energy storage system,Behind the meter battery storage EMoreShare International Trade (Suzhou) Co., Ltd , https://www.emoreshare.com