Efficiency; Fan Curve; Fan - Allen-Bradley PowerFlex 70 Reference Manual
Adjustable frequency ac drive
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Efficiency
Fan Curve
Fan
The following chart shows typical efficiency for PWM variable frequency
drives, regardless of size. Drives are most efficient at full load and full
speed.
100
vs. Speed
95
vs. Load
90
85
80
75
10
20
When torque performance (see
relationship between frequency and voltage is shown in the following
figure. The fan/pump curve generates voltage that is a function of the stator
frequency squared up to the motor nameplate frequency. Above base
frequency voltage is a linear function of frequency. At low speed the fan
curve can be offset by the run boost parameter to provide extra starting
torque if needed. No extra parameters are needed for fan/pump curve.
The pattern matches the speed vs. load characteristics of a centrifugal fan or
pump and optimizes the drive output to those characteristics.
Maximum Voltage
Base Voltage
(Nameplate)
Run Boost
See
Fan Curve
above.
30
40
50
60
70
% Speed/% Load
page
2-178) is set to Fan/Pump, the
Base Frequency
(Nameplate)
Efficiency
2-81
80
90
100
Maximum
Frequency
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