VFD022EL21A Delta Electronics 11A Single-Phase Micro Drive

Product Overview

The Delta Electronics VFD022EL21A is a commercial-grade, multi-functional micro AC inverter from the high-reliability VFD-EL series. Engineered to support standard induction motor assets up to 3 Horsepower (2.2 kW), this compact variable frequency drive features a convenient single-phase 230V input line configuration that outputs a balanced 3-phase current rated at 11 Amps. Optimized for tight panel footprints and streamlined installation, it incorporates a built-in digital operating keypad, side-by-side DIN-rail mounting capabilities, and an integrated dynamic braking chopper circuit. Relying on an advanced open-loop V/Hz scalar control module, the VFD022EL21A provides exceptionally smooth speed regulation and energy savings for mechanical fans, water pumps, conveyor systems, and dedicated packaging machines.

Core Technical Advantages

Stable Volts-per-Hertz Scalar Control

Operating on a standard open-loop V/Hz tracking profile, the drive supplies reliable voltage-to-frequency proportional output curves. This makes it an exceptionally efficient option for variable and constant torque loads that do not require complex, encoder-based closed-loop response networks.

Internal Dynamic Braking Chopper

A factory-integrated dynamic braking transistor comes standard on the internal power card. When connected to a compatible external power dissipation resistor, the drive effectively prevents overvoltage faults caused by high-inertia regenerative loads during aggressive deceleration cycles.

Onboard Digital User Interface

The drive features factory-integrated operator controls positioned directly on its front panel. This clear digital setup eliminates the need to source standalone keypads, allowing plant operators to quickly adjust frequency parameters, map digital I/O lines, and review active fault logs.

Technical Specifications

Installation and Maintenance

Frame Size B Spacing Clearances

The Frame B chassis features standard physical constraints of 6.85 x 3.94 x 5.35 inches and carries a net weight of approximately 1.4 kg (3.09 lbs). This compact footprint allows for easy DIN-rail attachment. Ensure you leave adequate open space above and below the cooling heatsinks to allow proper air passage inside the enclosure.

Single-Phase Input Power Termination

The incoming single-phase 200–240 V AC supply utility wires should be terminated exclusively onto the primary L1 and L2 terminals. Do not attach any incoming hot source wires onto terminals U, V, or W, as these are dedicated output vectors for supplying balanced 3-phase current to the induction motor.

Environmental Ingress Considerations

This micro inverter features a stock IP20 open-chassis rating and lacks environmental moisture seals. For machine configurations located in zones exposed to oil residue, conductive metal dust, or water spray, ensure the drive is installed inside a sealed secondary electrical cabinet (NEMA 12 or IP54).

Engineering Advantages

High-Frequency Processing Window

Capable of tracking and maintaining output currents up to a high frequency limit of 600 Hz, the VFD022EL21A easily manages specialized high-speed machinery assets, such as wood woodworking spindles, chemical mixers, and processing separators.

Programmable DC Injection Braking

The integrated DC injection control logic enables developers to apply a stationary DC magnetic field across the motor windings. This function provides holding torque to prevent mechanical drift on ventilation fans or heavily loaded conveyor setups prior to active motor acceleration.

Dense Side-by-Side Installation

The streamlined physical layout of the VFD-EL platform allows for adjacent, high-density side-by-side drive clusters on a single control rail. This layout significantly reduces required cabinet enclosure sizes and associated infrastructure costs.

Technical FAQs

Q1: Can I operate the VFD022EL21A drive by feeding it a standard 3-phase AC input?

A1: No, the VFD022EL21A is engineered exclusively for a single-phase 200–240 V AC input line. The internal rectifier circuit converts this single-phase source to provide a standard 3-phase variable frequency output for 3-phase induction motors.

Q2: What is the primary difference between Delta's VFD-E and VFD-EL drive series?

A2: The VFD-EL family is a cost-effective micro drive line that utilizes V/Hz scalar control alongside a built-in digital operating interface. The VFD-E series is a modular vector micro drive platform that provides open-loop vector tracking and supports plug-in expansion cards.

Q3: Is the dynamic braking resistor pre-installed inside the Frame B chassis?

A3: The unit contains the internal dynamic braking control circuit (chopper), but the heavy-duty power resistor itself is an external accessory. To enable active dynamic braking on high-inertia loads, you must size and install an external braking resistor separately.

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