... to sunlight, dust, corrosive gas, flammable gas, oil mist, steam , drip and salt.4.Vibration: <0.5G Scope of application ... , pharmacy,printing, building material,crane and all kinds of machine equipment.As AC asynchronous motor’s driving and speed control ... hoisting for driving and speeding control of AC asynchronous motor. energy saving inverter with vector control output frequency 0.00hz--600hz