Product Overview

The VFD022B21A (VFD022B21A) is an industrial general-purpose variable frequency drive belonging to Delta’s robust VFD-B series. This high-performance sensorless vector AC drive provides a 2.2 kW (3 HP) applicable motor capacity and operates on a 230 V single-phase input power supply.

Engineered for precise torque and velocity regulation across a variety of industrial automation sectors—including machine tool spindles, textile looms, transport conveyors, wastewater mixers, and commercial ventilation fans—the module features excellent low-speed torque output. By optimizing power delivery based on real-time rotor loading conditions, the drive maintains absolute mechanical shaft stability, suppressing load-induced current spikes and dropping unpredicted equipment failures to eliminate manufacturing downtime.

Part Number Nomenclature Breakdown

The unique alphanumeric code of the VFD022B21A details its structural specifications and hardware generation:

• VFD: Variable Frequency Drive (AC Motor Electronic Controller).

• 022: Applicable Motor Capacity indicating a 2.2 kW (3 HP) power capability.

• B: Product Series identifier representing the versatile VFD-B series platform.

• 21: Voltage Class and Phase specification designated for 230 V Single-phase input networks.

• A: Generation Version code specifying standard production design.

Technical Specifications

Product FAQs

How do engineers configure the "Skip Frequency" function to solve mechanical noise issues?

The VFD022B21A offers three independent skip frequency zones adjustable between 0.1 and 400 Hz. When a machine structure has a specific resonant frequency that causes extreme vibration or loud harmonic noise at certain speeds, the engineer programs these exact bands into the drive parameters. The inverter will then rapidly accelerate or decelerate through those targeted zones without running continuously within them.

Can this drive accept single-phase 230 V input and drive a standard 3-phase AC motor?

Yes. The VFD022B21A is designed specifically for this purpose. It takes single-phase 230 V AC power at its input terminals, rectifies it to a stable DC bus voltage, and then uses internal insulated-gate bipolar transistors (IGBTs) to invert it into a fully adjustable 3-phase AC output to control standard 3-phase induction motors.

What function does the Stall Prevention level provide during heavy deceleration?

The adjustable stall prevention mechanism (20% to 250%) continuously monitors the internal DC bus voltage and output current. If the motor decelerates too quickly under a high-inertia load, regenerative energy can cause an overvoltage trip. Stall prevention automatically delays deceleration or extends the ramp down time to keep the operational parameters within safe limits.

Field Commissioning and Panel Integration Standards

• Forced Airflow and Installation Spacing: Mount the VFD-B drive vertically onto an unpainted, grounded metal backplate inside the electrical control cabinet. Ensure the integrated cooling fan remains free of obstructions. Maintain a minimum clearance gap of 50 mm on both horizontal sides and 120 mm above and below the drive housing to maximize passive and forced thermal convection.

• Power Supply and Motor Interfacing: Connect incoming single-phase 230 VAC power exclusively to the designated main terminals (typically L1/R and L2/S). Wire the 3-phase output motor leads directly to terminals U, V, and W. Never wire incoming AC power lines to terminals U, V, or W, as applying raw line voltage to the output stage will destroy the internal switching transistors.

• Shielding and Control Wire Routing: Route all high-voltage motor output lines through separate grounded conduits away from the low-voltage control and analog signaling cables (such as 0-10 V speed pots or 4-20 mA PLC loops). Use symmetric shielded copper cables for the motor connections, and ground the braided shield at both the drive chassis base and the motor frame to mitigate high-frequency electromagnetic interference (EMI).