The application of Raynen inverter on fans and pumps has significant energy-saving effect, and has control characteristics of non-shock start and soft stop, which can greatly extend the service life of mechanical equipment and reduce equipment maintenance. At the same time, we incorporate the frequency conversion control device into the automatic control system, which is of great value in reducing system costs and improving system reliability. Our inverters have been widely used in metallurgy, electric power, petrochemical, heating and civil fan and water pump control fields.