Delta VFD037E23A VFD-E Variable Frequency Drive (3.7 kW / 5 HP)

Product Overview

The VFD037E23A (VFD 037E23A) is a versatile, sensorless vector control AC drive from Delta’s high-efficiency VFD-E series. Engineered for a 3.7 kW (5 HP) motor capacity, this drive operates on a 230 V three-phase input, making it a preferred choice for precision speed control in mid-range industrial power applications. The VFD037E23A is designed for flexibility, featuring a modular architecture that supports various fieldbus extensions and a built-in PLC for localized logic execution. Frequently deployed in woodworking machinery, textile looms, and fan/pump systems, this drive excels at providing high starting torque and stable velocity regulation while maintaining a compact, space-saving footprint in the control cabinet.

Technical Configuration

The VFD037E23A follows Delta's modular "Micro" design, emphasizing high power density and ease of maintenance. As a standard "A" version drive, it includes an integrated RFI switch for interference suppression and supports side-by-side installation to maximize DIN rail efficiency. The technical core of the E-series is its dual control mode capability: traditional V/f control for simple applications and Sensorless Vector Control (SVC) for more demanding tasks requiring high torque at low speeds. The unit is equipped with an RS-485 communication port supporting MODBUS protocol, allowing for seamless integration into factory-wide SCADA or PLC networks.

Technical Specifications

Technical FAQs

Does the VFD037E23A include a built-in keypad?

The VFD-E series typically comes with a built-in LED keypad for basic parameter adjustment and status monitoring. For more advanced programming or remote mounting, the KPE-LE02 digital keypad can be used as an external interface.

Can this 230 V three-phase drive be powered by a single-phase supply?

While some VFD-E models are rated for single-phase input, the VFD037E23A is technically specified for a three-phase 230 V supply. Attempting to run a 3.7 kW drive on single-phase power may lead to excessive ripple current on the DC bus and potential hardware failure unless the drive is significantly de-rated and auxiliary filtering is applied.

What is the purpose of the built-in PLC in this drive?

The 500-step PLC allows the drive to handle basic automation tasks independently. For example, it can manage a multi-step speed sequence based on sensor inputs or control a brake relay without needing an external controller, reducing overall system complexity.

Engineering & Installation Guide

• Modular Extension: The VFD037E23A supports several optional cards. If your application requires communication via Profibus, DeviceNet, or LonWorks, or if you need additional I/O, ensure the appropriate extension card is seated firmly in the modular slot before powering the unit.

• Braking Requirements: For applications with high inertia or rapid stop cycles (such as centrifuges or high-speed conveyors), the internal braking capacity may be insufficient. Install an external braking resistor across the B1 and B2 terminals to dissipate regenerative energy and prevent "Overvoltage" (ov) faults during deceleration.

• Environmental Protection: While the unit is IP20 rated, it should be installed in a clean, dry environment. If the drive is used in a textile or woodworking environment, use an enclosure with appropriate filtration to prevent conductive dust or fibers from entering the fan cooling path, which could lead to internal short circuits.