CMC 220V/440V Class motor
300 Hz.

Chapter 6 - Parameter Description [FU2]

Conditions for Sensorless Vector Control

Conditions for sensorless control are as follows. If one of the following conditions is not satisfied, the inverter may malfunction with insufficient torque, irregular rotation, or excessive motor noise. It is recommended to use V/F control.

Use a motor capacity that is equal to or one horsepower level lower than the inverter capacity. Two different motor parameters can be set for one inverter, but use only one motor parameter for sensorless control.

If the motor in use is notor using 220V/380V dual use motor, utilize the auto tuning feature in FU2-40 [Auto tuning] before starting. Set appropriate values for the electronic thermal function, the overload limit function and the stall prevention. The set values should not exceed 150% of the rated motor current.

When DRV–04[Frequency Mode] is set to “V1”, “I”, or “V1+I”, eliminate any potential noise influence with the frequency reference.

Pole number of the motor should be 2 pole, 4 pole, or 6 pole.

The distance between the inverter and the motor should not exceed 100m (328 ft).

Precautions When Using Sensorless Control Forced-cooling should be used for the motor when the average operating speed is under 20Hz and more than 100% load is used constantly.

The motor may rotate 0.5% faster than the maximum speed if the motor temperature does not reach normal operating temperature.

The performance can be improved during regeneration for systems with frequent acceleration and deceleration operations by installing the DB (Dynamic Brake) braking unit option.

Utilize the auto-tuning feature when the motor reaches normal temperature (average temperature where the motor normally operates).

Output torque may be reduced when an output filter option is used between the inverter and the motor. Speed change is more frequent than the V/F control. If the speed changes excessively when the FU2–38 [Carrier Frequency Selection] is set to a value more than 10kHz, change the setting to 5~10kHz.

Over current fault can occur if the FU2-41 [Stator Resistance (Rs)] is set to a value more than twice the auto tuned value

Max setting range is

Detail Tuning Method for Sensorless Vector Control

Adjust the FU2–34 [No Load Motor Current (RMS)] value

larger or smaller by 5% units if the current is larger or smaller than that of V/F control with small load. Adjust the FU2–32[Rated Motor Slip] value larger or smaller by 5% units if the speed is faster or slower than that of V/F control with small load.

Sensorless_T(Sensorless Vector Torque) Operation: Vector_TRQ(Vector control torque) Operation:

All settings are the same as Vector_SPD except using torque reference for torque control.

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HP 30 30 manual Detail Tuning Method for Sensorless Vector Control