Mitsubishi Electric 800 Series Instruction Manual page 544

5.13.5 Energy saving control
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
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.
Pr. Name
60 Energy saving control
G030 selection
 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.
NOTE
• 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.
Initial value Setting range
0 0
4
9
Description
Normal operation
Energy saving operation
Optimum excitation control
5.13 (G) Control parameters
3
4
5
5
5
6
7
8
9
10
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5. PARAMETERS