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ENERGY SAVING OPERATION FOR FANS AND PUMPS
6 ENERGY SAVING OPERATION FOR FANS AND
PUMPS
Set the following functions to perform energy saving operation for fans and pumps.
(1) Load pattern selection (Pr. 14)
Select the optimum output characteristic (V/F characteristic) that is suitable for the
application and load characteristics.
y Set Pr.14 Load pattern selection = "1 (for variable-torque load)."
y When the output frequency is equal to or less than the base frequency, the output voltage
changes by its square in proportion to the output frequency.
Use this setting to drive a load whose load torque changes in proportion to the square of
the speed, such as a fan and a pump.
(2) Optimum excitation control (Pr. 60)
Without a detailed parameter setting, the inverter automatically performs energy saving operation.
y Set Pr.60 Energy saving control selection = "9 (Optimum excitation control mode)."
y The Optimum excitation control mode is a control system which controls excitation current to improve the motor efficiency
to the maximum and determines output voltage as an energy saving method.
NOTE
y Load pattern selection is available only under V/F control. Load pattern selection is not available under General-
purpose magnetic flux vector control. ( Refer to Chapter 4 of the Instruction Manual (Applied).)
REMARKS
y When the motor capacity is too small as compared to the inverter capacity or two or more motors are connected to one inverter,
the energy saving effect is not expected.
NOTE
y When the Optimum excitation control mode is selected, deceleration time may be longer than the setting value. Since
overvoltage alarm tends to occur as compared to the constant-torque load characteristics, set a longer deceleration
time.
y Optimum excitation control is available only under V/F control. Optimum excitation control is not available under
General-purpose magnetic flux vector control. ( Refer to Chapter 4 of the Instruction Manual (Applied).)
y Optimum excitation control will not be performed during an automatic restart after instantaneous power failure.
y Since output voltage is controlled by Optimum excitation control, output current may slightly increase.
100%
Output voltage
Pr. 3 Base frequency
Output frequency (Hz)
Pr. 14 = 1