Mitsubishi Electric FR-F800 Series Instruction Manual page 558

5.13.5 Energy saving control
Magnetic flux Magnetic flux Magnetic flux
V/F V/F V/F
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
G030
 Energy saving operation (Pr.60 = "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 (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 energy saving operation mode, an energy saving effect is not expected for applications with high load torque or with the
equipment with frequent acceleration and deceleration.
• 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 energy saving operation mode or 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.
Downloaded from ManualsNet.com
Name Initial value
Energy saving
0
control selection
search engine
Setting range
0 Normal operation
4 Energy saving operation
9 Optimum excitation control
Description
5. PARAMETERS
5.13 (G) Control parameters
1
2
3
4
5
6
7
8
9
10
557