4-2 Function Mode *2: Convert moment of inertia J into motor shaft data. The larger the J value, the faster the response, resulting in a steep torque rise; the smaller the J value, the slower the response, resulting in a gradual torque rise. After setting the J value, adjust the response speed in speed response H005/H205. Arbitrary Motor Parameter •For arbitrary settings of motor parameters, the function codes vary depending on the setting of 1st/ 2nd control and on the set value of the motor parameter selection. • When 1st/2nd control is enabled and the motor parameter selection is set to "00" → Directly enter H020 to H024.
• When 1st/2nd control is enabled and the motor parameter selection is set to "01" or "02" → Directly enter H030 to H034. •If offline auto-tuning has not been performed, the motor parameters in the same capacity rank as the Inverter (standard motor parameters) are set in H030/H230 to H034/H234. 4 Sensorless Vector Control Functions •This function estimates and controls motor rpm and output torque based on the Inverter's output voltage and current, as well as the motor parameter settings. This control method provides high starting torque in a low-frequency range (0.3 Hz), enabling high-precision operation. •To use this function, set V/f characteristics selection A044/A244 to "03".
•To use this function, make sure that the motor parameter settings are suitable for your motor. (Refer to "Motor Parameter Selection" (page 4-110)). •Note the following before use: •Sufficient characteristics may not be obtained if you select a motor size two or more ranks lower than the motor size specified. •If sensorless vector control cannot provide the desired characteristics, adjust the motor parameters depending on the phenomena, as shown in the table below. 4-111 Operation status Phenomenon Adjusting method Adjustment item Power running Speed change ratio is a negative value. Increase motor parameter R2 gradually (up to set parameter × 1.2).
H021/H221/H031 Speed change ratio is a positive value. Reduce motor parameter R2 gradually (down to set parameter × 0.8). H021/H221/H031 Regeneration Insufficient torque at low frequency (several Hz) Increase motor parameter R1 gradually (up to set parameter × 1.2). H020/H220/H030 Increase motor parameter Io gradually (up to set parameter × 1.2). H023/H223/H033 During startup Shock occurs during startup. Reduce motor parameter J from the set parameter. H024/H224/H034 During deceleration Motor hunting Reduce the speed response. H005/H205 Reduce motor parameter J from the set parameter.
H024/H224/H034 During torque limit Insufficient torque at low frequency during torque limit Set a overload limit level lower than that of the torque. b021 b041 to b044 Low- frequency operation Rotation is not constant. Increase motor parameter J from the set parameter. H024/H224/H034 Related functions A001, A044/A244, F001, b040, b041 to b044, H002/H202, H003/H203, H004/H204, H005/H205, H020/H220, H021/H221, H022/H222, H023/ H223, H024/H224, H050/H250, H051/H251, H052/H252