Mitsubishi Electric FR-A800, Instruction Manual

Page: 839 / 1042

Parameters (G) Control parameters
FR-A800 5 - 659
5.16.4 Energy saving control
Inverter will perform energy saving control automatically even when the detailed parameter settings
are made.
It is appropriate for applications such as fan and pump.
Energy saving operation (setting "4")
●
Setting Pr. 60 = "4" will select the energy saving operation.
●
With the energy saving operation, the inverter will automatically control the output voltage so
the inverter output power during the constant-speed operation will become minimal.
●
Energy saving operation will be enabled under V/F control.
Optimum excitation control (setting "9")
●
Setting Pr. 60 = "9" will select the Optimum excitation control.
●
The Optimum excitation control is a control method to decide the output voltage by controlling
the excitation current so the efficiency of the motor is maximized.
●
Optimum excitation control will be enabled under V/F control and Advanced magnetic flux vector
control.
Pr. Name
Initial
value
Setting
range
Description
60
G030
Energy saving control
selection
0
0 Normal operation
4 Energy saving operation
9 Optimum excitation control
NOTES An energy saving effect is not expected with the energy saving operation mode for applications
with high load torque or with the equipment with frequent acceleration and deceleration.
An energy saving effect is not expected with the Optimum excitation control mode when the
motor capacity is extremely small compared with the inverter capacity or when multiple motors
are connected to a single inverter.
When the energy saving operation mode or Optimum excitation control mode is selected, the
deceleration time may become longer than setting value. Also, it may cause overvoltage more
often compared to constant-torque load characteristics, so set the deceleration time longer.
When the motor becomes unstable during the acceleration, set the acceleration time longer.
Output current may increase slightly with the energy saving operation mode or the Optimum
excitation control mode since the output voltage is controlled.
V/F V/F V/F
Magnetic flux Magnetic flux Magnetic flux