... phase, 220V AC 0.75KW inverter constant,variable torque mode, flexible I/O, field bus ... 1 channelDigital panelLED Displayindicate parameters: frequency ,output voltage, output current and so on.connected device ... voltage protection;under voltage protection;over heat protection;over load protectionOption partsextension cable of digital panel; brake resistor. frequency inverter VD4 series variable ...