Here’s a brief description of the Delta VFD004EL21W-1, based on the information I found:

• Series: EL-W Series, a compact vector control drive.

• Motor Power Range: 0.4 kW (0.5 HP) with a current rating of 2.5 A.

• Input Voltage: 230 V, single-phase.

• Key Features:

  • Multi-step operation and torque compensation.

  • Built-in PID control and multi-pump control for constant pressure.

  • Leakage detection and overload protection.

  • Energy-saving design with CE certification.

• Applications: Suitable for simple speed control, horizontal movement, and fixed load applications.

• Design: Compact, durable, and easy to maintain with natural or fan cooling options.