Control cabinet is fully sealed to avoid external dust or powder. In order to ensure reasonable inner temperature, we install fans on the top and bottom to realize internal air circulation. The whole control system components, low power consumption, high reliability. Through the thermal simulation of FlOWTHREM software, when the external environment is 45 ℃, the internal average temperature is 67 ℃, which meets the ambient temperature of components. Fundamentally solve the dust and pollution problems.