... motors of fans, pumps, compressors, mills, conveyors and lifts 1. Variable Frequency Drive characteristicsVFD is a masterpiece of outstanding performance and high ... %, which greatly reduce the resonance of the fan. VFD has frequency-skipping function to avoid the resonance of the system. It is no limit ... Pass Filter Fan, Kiln. Mining: Conveyor, Lift, Pump. Water: Pump. variable frequency convertor