CNC 4KW 4000w 220V 5HP Variable Frequency Drive Inverter VFD for Spindle Motor Speed Control This VFD can be used for constant torque loads ( such as hard starting: Air compressors, HVAC units) Power:4KW.ISO9001 quality certifications which means this item is the top quanlity item Universal AC Vector VFD Variable Frequency Drive Auto Voltage Regulation(AVR),Decelerating Stop or Coasting Stop,DC Braking,Auto Reset and Restart Carrier adjustable by 16KHZ, completely soundless working environment