3-25
3-5 Applied Operation
3-5-1 Energy-saving Mode
The
Inverter in energy-saving mode will automatically save unnecessary power supply
to the motor if the load is light and the motor is a standard motor or dedicated motor for
inverters.
The Inverter in energy-saving mode will estimate the load factor
of the motor from the
current
consumption of the motor
and controls the output voltage to supply only neces
-
sary
power if the load is light. Energy-saving mode is appropriate for loads with little fluc
-
tuation.
It is not appropriate for control that requires a response time of less than 50 ms.
The
longer the energy-saving time of the Inverter is, the more ef
fectively the power sup
-
plied
to the load is saved.
The power supplied to the load will be hardly saved if the load
exceeds 70% of the rated output torque of the motor.
The
Inverter in energy-saving mode cannot save
unnecessary power supply to special
motors, such as spindle motors and submersible motor.
Refer
to the following for the settings of the Inverter enabling it
to perform energy-saving
control.
H Energy-saving Control
The following are the energy-saving control steps of the Inverter.
1. The Inverter starts accelerating the motor normally. The Inverter does not perform energy-saving
control while the Inverter is accelerating the motor.
2. The
Inverter will perform energy-saving control when the output frequency corresponds to the fre
-
quency specified by the frequency reference.
3. The Inverter calculates the ideal output voltage from the running condition of the Inverter and the
energy-saving coefficient K2 set with n096.
4. The output voltage is changed to the ideal output voltage.
5. The
Inverter uses the auto-tuning function (search operation) to find the minimum output power that
the Inverter supplies to the motor.
Auto-tuning function (search operation):
Finds
the minimum output power that the Inverter supplies to the motor by changing the output
volt
-
age with the auto-tuning voltage steps set with n101 and n102.
6. The
Inverter starts decelerating the motor normally
. The Inverter does not perform energy-saving
control while the Inverter is decelerating the motor.
Preparing for Operation Chapter 3
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