... making, Injection machine, central air conditioning, numerical control machine tool, air-compressor, fan and pump, blower, air conditioner for large buildings; ... /60HzThree-phase 1140V,50/60HAllowable Fluctuation rangevoltage: ±15% frequency: ±5%controlControl systemhigh performance vector control inverter based on ... control, V/F+ PG control, vector + PG control variable frequency drives for AC motors