Energy Saving Operation; Optimum Excitation Control (Pr. 60) - Mitsubishi Electric FR-D720-0.4K Instruction Manual

Energy saving operation

4.14 Energy saving operation

Purpose
Energy saving operation

4.14.1 Optimum excitation control (Pr. 60)

Without a fine parameter setting, the inverter automatically performs energy saving operation.
This operation is optimum for fan and pump applications
Parameter
Number
Energy saving control
60
selection *
The above parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 163)
* When parameter is read using the FR-PU04, a parameter name different from an actual parameter is displayed.
When "9" is set in Pr. 60, the inverter operates in the Optimum excitation control mode.
The Optimum excitation control mode is a control system which controls excitation current to improve the motor efficiency
to maximum and determines output voltage as an energy saving method.
REMARKS
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
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.
Optimum excitation control is activated only under V/F control. Optimum excitation control does not function under
General-purpose magnetic flux vector control.
Optimum excitation control will not be performed during an automatic restart after instantaneous power failure.
Since output voltage is controlled by Optimum excitation control, output current may slightly increase.
If the acceleration time is too short during the Optimum excitation control, the motor rotation may become unstable.
In such case, set the acceleration time longer.
Parameters referred to
General-purpose magnetic flux vector control
Pr. 57 Restart coasting time
148
Optimum excitation control
Name Initial Value
Refer to page 76
Refer to page 137
Parameter that should be Set
V/F V/F V/F
Setting Range
0
0
9
Refer to Page
Pr. 60
Description
Normal operation mode
Optimum excitation control mode
148