The VFD004EL21A is a model of Delta frequency inverter (also known as a variable frequency drive or VFD). Delta Electronics is a well-known manufacturer of industrial automation equipment, including drives and inverters.

The VFD004EL21A is designed to control the speed and torque of three-phase induction motors. It is a compact and user-friendly inverter with a power rating of 0.4 kilowatts (kW) or 0.5 horsepower (HP). The inverter operates on a voltage range of 200-240 volts AC single-phase or three-phase. It supports various motor control modes, such as V/F control (Voltage/Frequency control), sensorless vector control, and torque control.

The VFD004EL21A offers several features and protections to ensure reliable and efficient motor control. It includes built-in PID control for process control applications and supports communication protocols such as Modbus RTU and CANopen for easy integration into automation systems. The inverter also provides overload protection, short circuit protection, motor overheating protection, and various fault detection mechanisms.

To configure and program the VFD004EL21A, Delta provides software tools such as Delta Motion Control (DMC) and Delta VFDSoft, allowing users to set parameters, monitor operation, and perform diagnostics.