Energy Saving Operation (Pr. 60) - Mitsubishi Electric FR-F740 EC Instruction Manual

Energy saving operation (Pr. 60)

5.6 Energy saving operation (Pr. 60)
Without a fine parameter setting, the inverter automatically performs energy saving operation.
This inverter is appropriate for fan and pump applications.
Pr.
Name
No.
60
Energy saving control selection
Energy saving operation mode (Pr. 60 = 4)
When "4" is set in Pr. 60, the inverter operates in the energy saving operation mode.
In the energy saving operation mode, the inverter automatically controls the output voltage to
minimize the inverter output voltage during a constant operation. Up to 30% energy can be
saved by this.
NOTES
For applications a large load torque is applied to or machines repeat frequent acceleration/
deceleration, an energy saving effect is not expected.
Optimum excitation control mode (Pr. 60 = 9)
When "9" is set in Pr. 60, the inverter operates in the optimum excitation control mode.
This exclusive Mitsubishi Electric control method reduces motor losses in the low-load operating
range and at frequencies below the motor's rated frequency, thus operating the motor with op-
timum efficiency.
NOTES
When the motor capacity is too small as compared to the inverter capacity or two or more
motors are connected to one inverter, the optimum excitation control is not expected.
When the energy saving mode and optimum excitation control mode are selected (parame-
ter 60 = 4 or 9), deceleration time may be longer than the setting value. Since over voltage
alarm tends to occur as compared to the constant torque characteristics, set a longer decel-
eration time.
Since output voltage is controlled in energy saving operation mode and by optimum excita-
tion control, output current may slightly increase.
When you want to check the energy saving effect, refer to section 6.13 to check the energy
saving effect monitor.
5 - 10
Initial Value Setting Range
0
0 4
9
Basic settings
Description
Normal operation mode
Energy saving operation mode
Optimum excitation control mode