Airnergy Management Services
Resource Optimization, Energy Audits and Conservation

Retrofit any make and model of fixed speed air compressor with variable speed/frequency drive cabinet complete with VSD-R PID controller.


The variable speed/frequency drive is located adjacent to the air compressor/drive motor. The VSD-R “PID‟ controller is housed in a separate wall mounted enclosure


The VSD-R controller & variable speed/frequency drive will control the speed of an air compressor’s main motor in response to pressure variations (demand).


The VSD-R controller, variable speed/frequency drive and air compressor combination can function as a “stand-alone‟ variable speed drive air compressor “unit‟ or operate in conjunction with the system control products.


The VSD-R controller performs all pressure regulation functions (including internal ΔP) and controls the air compressor using load/unload commands. This is achieved by integration of the compressor unit’s pressure switch with an “i-PCB‟ or using the compressor controller’s remote load/unload input. The air compressor control system will respond in an identical manner as if the VSD-R controller was a remote regulation/system control unit.


In addition to drive output current, voltage & frequency, the VSD-R controller monitors the temperature of the motor casing or motor cooling air outlet during operation and limits minimum speed for enhanced motor protection.


Contact Airnergy for technical specifications and VSD packages sizing and costs.

  Fixed Speed Compressor Retrofit VSD