... frequency converter 0.4KW-7.5KW Main features16-bit microprocessor controlled PWM outputAutomatic torque boost & slip compensationOutput frequency 0.1~400Hz8-step speed control ... Power Loss restart, Auto Tuning, Frequency Limits,Parameter Lock/Reset, Vector Control, Counter. PID Control, PLC,MODBUS Communication, Reverse Inhibition, ... 20 to 50HzApprovalsC € © FST-500 mini SVC frequency converter