Chapter 12 Description of Parameter SettingsMS300
461
Adjustment for operation with light load
8. Start the motor without load / with light load and operate to 1/2 of the rated rotor speed
A1. Start operation direction:
a. If the start operation direction is wrong
SPM: increase the current proportion for Pr.10-42 (initial angle detection pulse value)
to improve the accuracy of the angle detection.
IPM: Increase the voltage for Pr.10-52 (injection magnitude) to improve the accuracy of
the angle detection.
b. If an ocA error occurs when pressing RUN to start the motor, decrease the current
proportion for Pr.10-42 (initial angle detection pulse value).
A2. Operates the motor in 1/2 of the rated rotor speed, adjust the no-load operating current
If the no-load operating current exceeds 20% of the rated current, increase Pr.07-26
(torque compensation gain) and observe the no-load operating current.
A3. Accelerate to the rated frequency and observe if the motor operates stably.
a. If the motor output rotor speed presents periodic low-frequency wave, increase Pr.10-
34 (PM sensorless speed estimator low-pass filter gain), or increase Pr.10-32 (PM
FOC sensorless speed estimator bandwidth).
b. If the output frequency reflects high frequency vibration, decrease Pr.10-34 or
decrease Pr.10-32.
A4. Accelerate the motor to the maximum rotor speed, and observe if it operates stably.
If the motor stalls when accelerating to the maximum rotor speed, then increase Pr.10-
34 (PM sensorless speed estimator low-pass filter gain), or increase Pr.00-17 (carrier
frequency, you must set the carrier frequency larger than 10 times of the maximum
output frequency)
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