... fans, pumps, compressors, mills, conveyors and lifts 1. Variable Frequency Drive characteristicsVFD is a masterpiece of outstanding performance and high ... 0.95 with the load of 20~100%, very low harmonic voltage/current, no power factor correction capacitor and ... accurate protection. The basic protection includes over voltage, over current, low voltage, phase loss, over load, over heat, earth fault, ...