VFD for Air Compressor

Intelligent VFD solutions for screw compressors, rotary compressors, and compressed air systems

Overview

A VFD air compressor drive system is the single most effective upgrade for reducing compressed air energy costs, which typically represent 70-80% of a compressor’s total lifecycle cost. SHZK VFD screw compressor controllers match compressed air output precisely to demand, eliminating the energy waste of traditional load/unload cycling where motors continue running at full speed during no-load periods. Our VFDs are purpose-designed for air compressor applications with features including integrated pressure transmitter input for closed-loop discharge pressure control, automatic sleep mode during zero-air-demand periods, multi-compressor master-slave coordination for compressor rooms, and oil pump interlock protection for screw compressor safety. Supporting power ranges from 2.2kW to 400kW, SHZK VFD air compressor drives are compatible with all major compressor brands and types including oil-injected screw compressors, oil-free screw compressors, rotary vane compressors, and piston compressors. The drives maintain stable system pressure within ±0.01 MPa, extending equipment life and improving end-product quality in manufacturing processes.

Key Benefits of Using SHZK VFD for Air Compressor System

• Energy saving of 20-45% by eliminating load/unload cycling losses
• Precise discharge pressure control within ±0.01 MPa
• Soft start reduces mechanical shock, extending compressor and motor bearing life
• Multi-compressor coordination for optimal compressor room efficiency
• Automatic energy-saving mode adapts to varying demand patterns
• Integrated protection for oil temperature, overpressure, and motor overload

Recommended Models

Series	Power Range	Input	Output	Best For
AT-310	2.2-15kW	1Φ220V / 3Φ380V	3Φ380V	Small screw compressors, workshop air systems
AT-700	2.2-400kW	3Φ380V	3Φ380V	Industrial screw compressors, centralized air supply
AT-9000	45-400kW	3Φ380V	3Φ380V	Large compressor rooms, multi-compressor coordination

Application Cases

Case 1: Automotive Parts Manufacturing — An auto parts factory replaced the load/unload controller on their 2 × 75kW screw compressors with SHZK AT-700 VFDs. The VFDs maintain constant discharge pressure at 0.7 MPa, matching output to the plant’s highly variable pneumatic tool demand. Annual electricity savings reached 35%, with the investment recovered in under 12 months.

Case 2: Textile Mill Compressed Air System — A textile mill with 4 × 37kW compressors installed SHZK VFD screw compressor drives on two units, configured in master-slave mode. The system maintains stable 0.6 MPa supply pressure for air-jet looms, reducing energy waste from 28% idle-time losses to near-zero, saving over ¥180,000 annually in electricity costs.

Case 3: Food & Beverage Packaging Line — A beverage bottling plant deployed SHZK AT-310 VFD on their 15kW packaging air compressor. The drive’s precise pressure control eliminated product defects caused by pressure fluctuations, while reducing compressor noise from 82 dB to 72 dB, improving the working environment.

Recommended Series: SHZK VFD300 N/T Series (G-Type)

💬 Need help choosing the right model? Contact our engineering team for a free technical consultation tailored to your application.