Delta VFD004EL21W-1 0.4kW 0.5HP Single Phase to Three Phase VFD

Overview

The Delta VFD004EL21W-1 is a 0.4 kW (0.5 HP) reliable variable frequency drive (VFD) from Delta’s VFD-EL-W Series family. It accepts a single-phase 230 V supply and delivers a three-phase output, rated at 2.5 A, to drive motors up to 0.4 kW / 0.5 HP. This single-to-three-phase capability makes it especially useful in Indian workshops, OEM panels and small machinery where only a single-phase supply is available but a standard three-phase induction motor still needs smooth, controllable speed. With both V/f and Sensorless Vector Control (SVC) and an output range of 0.1–400 Hz, the VFD004EL21W-1 gives precise, stepless speed control for variable-torque and constant-torque loads alike. Its sensorless-vector control and built-in keypad make it quick to commission while delivering firmer speed holding under changing load.

Key Features

• Input: 1-Phase 200–240 V AC, 50/60 Hz
• Output: 3-Phase 0–240 V AC, 0.4 kW / 0.5 HP, rated 2.5 A
• Output frequency 0.1–400 Hz
• Overload capacity 150% of rated current for 60 seconds
• Sensorless Vector Control for higher low-speed torque
• Built-in PID, multi-pump control and two-motor parallel operation
• Torque boost and Time-Out detection functions
• Communication: RS-485, Modbus RTU
• Enclosure: IP20

Technical Benefits

The 2.5 A rating with 150% of rated current for 60 seconds gives the breakaway headroom that belt, pump and small-machine loads need at start-up without nuisance tripping. Running fans and pumps at variable speed instead of a fixed 50 Hz cuts energy use sharply—on these loads, power scales with roughly the cube of speed—while soft start and stop reduce mechanical and belt wear and eliminate direct-on-line inrush current. Sensorless Vector Control delivers stronger torque at low speed than plain V/f, and the built-in EMC filter plus PID and multi-pump functions reduce the external components a panel builder has to add.

Selection & Compatibility

The VFD004EL21W-1 pairs with standard three-phase 230 V induction motors up to 0.4 kW / 0.5 HP. As a sizing rule, match the drive to the motor’s full-load current rather than its kW alone: confirm the motor draws no more than 2.5 A, and for heavy constant-torque or high-inertia loads consider the next frame up for extra overload margin. Make sure a single-phase 230 V supply is available at the machine. For long motor cables or EMC-sensitive installations, add the recommended output reactor or a zero-phase core. Our engineers can confirm drive sizing, braking-resistor requirements and key parameter settings before you place the order.

Applications

Thanks to its single-phase input, it is a popular choice where three-phase mains is not available:

• display and demo equipment
• benchtop and DIY machinery
• small monoblock and circulation pumps
• laboratory and test rigs
• small mixers and stirrers
• small exhaust and ventilation fans
• dosing and metering pumps

About the Delta EL-W Series

The Delta VFD-EL-W is a compact sensorless-vector-control drive that upgrades the classic EL platform with higher starting torque and richer application functions. It adds a built-in EMC filter, PID feedback, multi-pump control, two-motor parallel operation, torque boost and a Time-Out detection function, all in a space-saving body suited to OEM panels and machine retrofits.