Maxwolf 3KW VFD Variable Frequency Drive Inverter for Spindle Motor Speed Control 4HP 13A 220-250V (220V/3KW VFD) Input Voltage: 220-250V/Input Frequency: 48-63 Hz/Output Frequency: 0-400 Hz/Power:3.0KW Input Phase: 1 or 3 phase;Output Phase: 3 phase PID control; advanced calculus PID closed-loop arithmetic, quick responding speed and high suitability Low output ratting torque0.5HZ-150%, low speed running ability With perfect error protection and short circuit starting protection capability