Proof inverter inverter working principle is widely used in a variety of chemical storage of grain and oil-proof industrial equipment, mainly by changing the output power to regulate the ordinary three-phase asynchronous motor speed to achieve the production process requirements or implementation section electrical purposes, saving rate of 30 to 60%, also can be used as motor soft start controllers, can also form a closed loop speed control system through sensors, transmitters and other control circuitry, simple installation and operation, the power factor is constant, and also with fault display and other functions. For 1 and Zone 2 hazardous locations; IIA, IIB class flammable gas environment; indoor and outdoor work environments. Proof inverter stable quality, safety, reliability, quality, year replacement, three-year warranty. Inverter works