Both variable displacement compressors and compressors with variable speed drive technology are based around compressed air energy efficiency principles. The technology, however, differs in its approach.
Variable displacement compressors rely on multiple control systems that function simultaneously. The three control systems that work together in a variable displacement compressor include:
Variable capacity valve
Inlet valve
Pressure switch
Each system is controlled independently, but each system also needs to be tuned in order to reach maximum efficiency. Over time, pressure settings can drift or get stuck, causing the inlet valve to start closing before the variable capacity valve has completely turned back. This effect decreases the potential energy savings of the machine.
Alternately, a variable speed drive adjusts the compressor’s operating speed in real time so production exactly matches demand and no tuning is required. Advanced electronic controls regulate the speed of the motor and a converter in the variable speed drive system automatically controls both acceleration and deceleration levels. This eliminates amperage peaks and helps protect electrical and mechanical components from stresses that can shorten the life of the air compressor.
If you have a question or would like to learn more about variable speed drive compressors, contact us or visit our website to learn about products and applications that utilize variable speed drive technology.
