6-5
6-2 Energy-saving Control
The energy-saving control function automatically saves unnecessary power that is use-
lessly consumed while the load is light.
The Inverter in energy-saving control estimates the capacity of the load from the motor
current and controls the output voltage of the Inverter when the load is light so that only
the power required is provided to the motor.
Energy-saving control is suitable for loads with little fluctuation. It is not suitable for con-
trol where responses of less than 50 ms are required.
The longer the operation time of the Inverter in energy-saving control of a light load is,
the more energy is saved. If the load exceeds 70% of the rated motor torque, only some
energy may be saved.
This control is available to general-purpose motor and Inverter-dedicated motors but not
applicable to special motors such as spindle motors or underwater motors.
Energy-saving control is possible in V/f control mode only and does not operate in vector
control mode.
The following description provides details of the operation and adjustment of the Inverter
in energy-saving control.
6-2-1 Energy-saving Control Operation
• The Inverter operates in energy-saving control as described below.
Acceleration
The Inverter accelerates normally and is not in energy-saving control.
Constant Speed
1. When the Inverter reaches the reference frequency, the Inverter operates in energy-saving control.
2. An ideal output voltage is calculated from the internal status of the Inverter and energy-saving con-
trol coefficient K2 in n140.
3. The Inverter changes the output voltage to the calculated voltage.
4. The Inverter goes into probe operation to find the point where output power is at the minimum.
Probe operation: A control method to find the point where the power is at the minimum while chang-
ing the voltage according to the probe operation control voltage step set in n145 and n146.
Advanced Operation Chapter 6
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