Mitsubishi Electric 800 Series Instruction Manual (Function page 475

17.4
Energy saving control
V/F V/F V/F
Magnetic flux Magnetic flux Magnetic flux
The inverter will automatically perform energy saving operation without setting detailed parameters.
This control method is suitable for applications such as fans and pumps.
Pr.
60 Energy saving
G030 control selection
 Optimum excitation control (Pr.60 = "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.
NOTE
• In the Optimum excitation control mode, an energy saving effect is not expected when the motor capacity is extremely small
compared with the inverter capacity or when multiple motors are connected to a single inverter.
• When the Optimum excitation control mode is selected, the deceleration time may become longer than the 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.
474
17. (G) Control Parameters
17.4 Energy saving control
Name Initial value
0
Setting range
0 Normal operation
9 Optimum excitation control
Description