4.14 Energy saving operation and energy saving monitor
Energy saving operation
How much energy can be saved
4.14.1 Energy saving control and Optimum excitation control (Pr. 60)
Without a fine parameter setting, the inverter automatically performs energy saving control.
This inverter is optimum for fan and pump applications.
Energy saving control selection *
* When parameter is read using the FR-PU04, a parameter name different from an actual parameter is displayed.
(1) Energy saving operation mode (Setting "4")
When "4" is set in Pr. 60, the inverter operates in the energy saving operation mode.
In the energy saving operation mode, the inverter automatically controls the output voltage to minimize the inverter
output voltage during a constant operation.
For applications a large load torque is applied to or machines repeat frequent acceleration/deceleration, an energy saving effect
is not expected.
(2) Optimum excitation control mode (Setting "9")
When "9" is set in Pr. 60, the inverter operates in the Optimum excitation control mode.
The Optimum excitation control mode is a control method which controls excitation current to improve the motor
efficiency to maximum and determines output voltage as an energy saving method.
When the motor capacity is too small as compared to the inverter capacity or two or more motors are connected to the inverter,
the energy saving effect is not expected.
When the energy saving mode and Optimum excitation control mode are selected, deceleration time may be longer than the
setting value. Since overvoltage fault tends to occur as compared to the constant-torque load characteristics, set a longer
The energy saving operation mode and Optimum excitation control function only under V/F control. When a value other than
"9999" is set in Pr. 80 Motor capacity(Simple magnetic flux vector control), the energy saving mode and Optimum excitation control
Since output voltage is controlled in energy saving operation mode and by Optimum excitation control, output current may
Parameters referred to
Pr. 80 Motor capacity(Simple magnetic flux vector control)
Parameter that must be Set
Energy saving operation and
Optimum excitation control
Energy saving monitor
Refer to page 68
Energy saving operation and energy saving monitor
Pr. 52, Pr. 54, Pr. 158,
Pr. 891 to Pr. 899
Normal operation mode
Energy saving operation mode
Optimum excitation control mode