158
Energy saving operation and energy saving monitor
4.14 Energy saving operation and energy saving monitor
4.14.1 Energy saving control and Optimum excitation control (Pr. 60)
(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.
(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.
Purpose Parameter that must be Set
Refer to
Page
Energy saving operation
Energy saving operation and
Optimum excitation control
Pr. 60 158
How much energy can be saved Energy saving monitor
Pr. 52, Pr. 54, Pr. 158,
Pr. 891 to Pr. 899
159
Without a fine parameter setting, the inverter automatically performs energy saving control.
This inverter is optimum for fan and pump applications.
Parameter
Number
Name Initial Value Setting Range Description
60 Energy saving control selection * 0
0 Normal operation mode
4 Energy saving operation mode
9 Optimum excitation control mode
* When parameter is read using the FR-PU04, a parameter name different from an actual parameter is displayed.
REMARKS
For applications a large load torque is applied to or machines repeat frequent acceleration/deceleration, an energy saving effect
is not expected.
REMARKS
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.
CAUTION
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
deceleration time.
Since output voltage is controlled in energy saving operation mode and by Optimum excitation control, output current may
slightly increase.
Parameters referred to
Pr. 80 Motor capacity Refer to page 72
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