Protective Function:Overcurrent, overvoltage, undervoltage, module fault, electric thermal relay, overheat, short circuit, default phase of input and output, motor parameter adjustment abnormality, internal memory fault, etc. Control characteristics:V/F control, no PG vector control (sensorless vector control, open loop vector control) Built-in PID control(user pressure control, constant output pressure) Relay output: TA/TB/TC - normally open, normally closed