... , pumps, compressors, mills, conveyors and lifts 1. Variable Frequency Drive characteristicsVFD is a masterpiece of outstanding performance and high ... factor correction capacitor and harmonic filter required Output sine step PWM waveform, no output filter required, VFD is directly connected ... fan. VFD has frequency-skipping function to avoid the resonance of the system. It is no limit to the length of ...