Delta VFD007EL21A 0.75kW 1HP Single Phase to Three Phase VFD

Overview

The Delta VFD007EL21A is a 0.75 kW (1 HP) space-saving variable frequency drive (VFD) from Delta’s VFD-EL Series family. It runs a standard three-phase motor from an ordinary single-phase 230 V mains, rated at 4.2 A, to drive motors up to 0.75 kW / 1 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 V/f (scalar) control with a 3-point adjustable V/f curve and an output range of 0.1–600 Hz, the VFD007EL21A gives precise, stepless speed control for variable-torque and constant-torque loads alike. Supplied with a built-in keypad, it is quick to commission for basic speed control and equally at home inside an OEM control panel.

Key Features

• Input: 1-Phase 200–240 V AC, 50/60 Hz
• Output: 3-Phase 0–240 V AC, 0.75 kW / 1 HP, rated 4.2 A
• Output frequency 0.1–600 Hz
• Overload capacity 150% of rated current for 60 seconds
• Built-in PID feedback control
• RFI switch and DC-bus sharing for side-by-side installation
• High-precision current detection with full electronic protection
• Communication: RS-485 (RJ-45), Modbus RTU
• Enclosure: IP20

Technical Benefits

The 4.2 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. The built-in EMI filter helps the panel meet electromagnetic-compatibility expectations without a separate filter, and DC-bus sharing lets several drives sit side by side to save cabinet space.

Selection & Compatibility

The VFD007EL21A pairs with standard three-phase 230 V induction motors up to 0.75 kW / 1 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 4.2 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:

• mixers and agitators
• short belt and roller conveyors
• centrifugal and monoblock pumps
• wood-working machines
• small lathes and drilling machines
• textile and spinning machines
• packaging and labelling machines

About the Delta EL Series

The Delta VFD-EL is a proven new-generation micro-type AC drive built for simple, cost-effective speed control. It combines a genuinely compact footprint with a built-in EMI filter, RFI switch, built-in keypad, built-in PID control and Modbus connectivity, and supports optional Profibus, DeviceNet, CANopen and LonWorks modules. DC-bus sharing allows side-by-side mounting to save panel space.