The Delta VFD-E AC Drive is a Sensorless Vector frequency inverter. The VFD-E series represent Delta Electronics low power, constant torque, IP20 rated AC Drive. Modular in design with flexible extension cards and a built-in PLC function, the Delta VFD-E AC Drive offers the ability to write and to execute simple Ladder Logic programs. This state-of-the-art series meets a full range of application requirements.