Energy Saving Operation - Mitsubishi Electric FR-D720S SC EC Instruction Manual

Parameter
6.13

Energy saving operation

Purpose
Energy saving operation
6.13.1 Optimum excitation control (Pr. 60)
Without a fine parameter setting, the inverter automatically performs energy saving operation.
This inverter is optimum for fan and pump applications.
Pr.
Name
No.
Energy saving control
60
selection
The above parameter can be set when Pr. 160 = 0.
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 im-
prove the motor efficiency to maximum and determines output voltage as an energy saving
method.
NOTES
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 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 functions 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 instanta-
neous power failure.
Since output voltage is controlled by optimum excitation control, output current may slightly
increase.
FR-D700 SC EC
Parameters that must be set
Energy saving operation and optimum
excitation control
Initial Setting
Description
Value Range
0 Normal operation mode
0
9 Optimum excitation control mode
Energy saving operation
Pr. 60
V/F V/F V/F
Parameters referred to
57
Refer to
Section
6.13.1
Refer to
Section
General-purpose 6.2.2
magnetic flux vec-
tor control
Restart coasting 6.11.1
time
6 - 143