Learning Advanced Features
For high-performance operation, the parameters of the motor connected to the inverter
output must be measured. Use auto tuning (bA.20 Auto Tuning) to measure the
parameters before you run sensorless vector operation. To run high-performance
sensorless vector control, the inverter and the motor must have the same capacity. If the
motor capacity is smaller than the inverter capacity by more than two levels, control may
be inaccurate. In that case, change the control mode to V/F control. When operating with
sensorless vector control, do not connect multiple motors to the inverter output.
Sensorless Vector Control Operation Setting for Induction
Motors
To run sensorless vector control operation, set dr.09 (Control Mode) to 4 (IM sensorless), select the
capacity of the motor at dr.14 (Motor Capacity), and enter the nameplate information of the motor
in the below parameters.
Input (Motor Name plate Information)
Efficiency
(when no information is on the name plate, default values are
used.)
After setting the above, set bA.20 (Auto tuning) to 1 (All - rotation type) or 2 (All - static type) and
run auto tuning. Rotation type auto tuning is more accurate than Static type. Set 1 (All -Rotation
type) if the motor can be rotated.
Excitation Current
A motor can be operated only after magnetic flux is generated by current flowing through
the stator. When the motor is connected to the output of the inverter, excitation current
flowing in the stator creates the magnetic flux required to operate the motor.
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