WD400 0.75kW VFD Case Study

Background

Small industrial equipment such as fans, water pumps, and compressors often runs on low-power motors that still require accurate speed regulation for efficient, stable operation. Without variable frequency control, these motors typically run at fixed speed, leading to unnecessary energy consumption and reduced flexibility in process control.

Challenge

The customer needed a compact, cost-effective three-phase VFD for a 0.75kW motor, capable of operating across a wide input voltage range (380V–480V) with reliable vector control performance for fan, pump, and compressor applications.

Solution: Wolong WD400 Series

Wolong supplied the WD400-T3-R75G-B-GJZ, a general-purpose three-phase VFD from the WD400 series, designed for small-power industrial applications. Key aspects of the solution included:

• Wide Voltage Compatibility: Supports 380V/400V/440V/460V/480V three-phase input, suitable for deployment across different regional power grids

• Compact Design: Dimensions of 80×155×200mm, ideal for space-limited installations

• Multiple Control Modes: V/F Control, Sensorless Vector Control (SVC), Flux Vector Control (FVC), and PWM Control for accurate adaptation to different load types

• Reliable Overload Capacity: Rated output current of 3A, with a maximum output current of 4.5A (60s overload capacity) to handle short-term load spikes

• Wide Frequency Range: 0–600Hz output frequency, supporting flexible speed regulation for fans, pumps, and compressors

Key Results

• Stable, accurate speed control for fans, water pumps, and compressors

• Compact form factor allowing easy installation in tight equipment layouts

• Wide voltage compatibility reducing the need for region-specific product variants

• Reliable performance validated under CE certification, complying with EU standards

Technical Specifications

The Wolong WD400 series provides a compact, reliable solution for small-power industrial motor control. With flexible voltage compatibility and multiple control modes, it is well-suited for fans, water pumps, compressors, and other general industrial equipment requiring efficient, accurate speed regulation.