... (IP54) motor has the maximum efficiency, while the loading rate at about 75%.(2) Y2 series (IP54) three-phase asynchronous motor’s ... conditions:1, The ambient temperature shouldn’t surpass 40°C, and not lower than -15°C.2, Average maximum relative humidity should not be over ... month should not be over 25°C.3, Elevation shouldn’t surpass 1000 metres.4, Rating frequency is 50HZ.5, Rating voltage is ...