Learning Advanced Features
Sensorless voltage
compensation 1
Sensorless voltage
compensation 2
Sensorless voltage
compensation 3
weakening start
Sensorless gain
switching frequency
*Cn.23-32 and Cn.85-95 can be displayed only when Cn.20 is set to 1 (Yes).
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.
5.10.1 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 you will use at dr.14 (Motor Capacity), and select the appropriate codes to
enter the rating plate information of the motor.
Input (Motor Rating Plate Information)
Efficiency (when no information is on the rating plate, default values are used.)
After setting each code, set bA.20 (Auto tuning) to 1 (All - rotation type) or 2 (All - static type) and
run auto tuning. Because rotation type auto tuning is more accurate than static type auto tuning,
select 1 (All - rotation type) and run auto tuning if you can rotate the motor.
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