What's the Difference Between Fixed Speed and Variable Speed Compressors?
Variable Speed Rotary Screw Compressors
VSD (variable speed) compressors maintain a constant air pressure and will adjust the motor speed to meet your plant’s air demand. VSD units can run on 100% flow or can fluctuate to less flow to conserve energy and align with the current air demand.
Fixed Speed Rotary Screw Compressors
Fixed speed compressors run either full throttle or are off. These are ideal in applications where there is a constant compressed air demand 24/7. The machine will run at a constant RPM unless turned off. The inlet valve will flutter based on when air is needed or not needed instead of ramping the engine up and down.
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Variable Speed Benefits
- Reduced energy consumption (in the proper application)
- Quieter than a fixed speed when running at a lower RPM
- Consistent plant pressure
- Increased component lifetime
- Low inrush current during motor starts
- May qualify for energy incentives
Fixed Speed Benefits
- Lower capital cost
- Increased parts availability
- Lower maintenance and repair costs
- Most efficient in applications with a consistent demand
For any questions about which compressor works best for your industry, please contact Chicago Pneumatic tech support or find a local distributor today.
VSD (variable speed) compressors maintain a constant air pressure and will adjust the motor speed to meet your plant’s air demand. Fixed speed compressors run either full throttle or are off.
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