Learning Advanced Features
After entering the codes, set bA.20 (Auto tuning) to 7 [All(PM)] and perform a static auto
tuning operation. When auto tuning is complete, the bA.21 (Rs), bA.28 Ld (PM), bA. 29 Lq
(PM), and bA. 30 (PM Flux Ref) parameters are automatically measured and saved.
Sensorless Vector Control Operation Setting Details
Sets the PWM interrupter cycle and sampling frequency cycle for a
PM synchronous motor operation in sensorless vector control mode.
The default carrier frequency is set at 5 kHz, and the setting range is
2–10 kHz.
Sets the zero-speed control time (hold time) in the stopped
position. The output is blocked after zero-speed operation for a set
period when the motor decelerates and is stopped by a stop
command.
Cn.12 ASR P Gain1,
Cn.13 ASR I Gain1
Cn.15 ASR P Gain2
Cn.16 ASR I Gain2
Changes the speed PI controller gain during a PM synchronous
motor operation in sensorless vector control mode. For a PI speed
controller, P gain is a proportional gain for the speed deviation. If
the speed deviation becomes greater than the torque, the output
command will increase accordingly. The higher the value
becomes, the faster the speed deviation will decrease.
The speed controller I gain is the integral gain for speed deviation.
It is the time taken for the gain to reach the rated torque output
command while constant speed deviation continues. The lower the
value becomes, the faster the speed deviation will decrease.
As the motor inertia varies by motor, the gain values should be
changed according to the motor speeds. Cn.12 and Cn. 13 set the
low speed P/I controller gain values, while Cn.15 and Cn.16 set the
high speed P/I controller gain values, so that an appropriate gain
value can be used for different motor speeds.
Cn.33 PM EdGain Perc,
Cn.34 PM EqGain Perc
To ensure that the back-EMF with rotor position information can be
appropriately estimated during a PM synchronous motor operation in
sensorless vector control mode, set these values as a percentage of
the proportional gain, which is designed to have stable estimator
polarity.
Higher values result in faster responses, with higher chances of
increased motor vibration.
Excessively low values may result in motor startup failure due to slow
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