Application Limits of Variable Frequency Drives in Fan and Pump Loads
Speed control savings depend on load characteristics, operating range, and system resistance; verify operating conditions before estimating energy savings.
Shaft power for fans and pumps varies with speed, offering energy-saving potential during variable-speed operation at partial load. Actual savings depend on the system resistance curve, minimum flow requirements, and operating duration.
Before retrofitting, record typical operating conditions (flow rate, pressure, and current) to verify the adjustable range for variable frequency operation. For systems requiring minimum flow maintenance, evaluate bypass and interlock logic as well.
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