Sensorless Vector Control - Omron SYSDRIVE RX Series User Manual

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" →
• When 1st/2nd control is enabled and the motor parameter selection is set to "01" or "02" →
•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

•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 4-112)).
•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.
Operation
status
Speed change ratio is a
negative value.
Power
running
Speed change ratio is a
positive value.
Insufficient torque at low
Regeneration
frequency (several Hz)
During Shock occurs during
startup startup.
During
Motor hunting
deceleration
Insufficient torque at low
During
frequency during torque
torque limit
limit
Low-
frequency Rotation is not constant. Increase motor parameter J from the set parameter.
operation
Related functions
4-113
Directly enter H020 to H024.
Directly enter H030 to H034.
Phenomenon
Increase motor parameter R2 gradually (up to set
parameter × 1.2).
Reduce motor parameter R2 gradually (down to set
parameter × 0.8).
Increase motor parameter R1 gradually (up to set
parameter × 1.2).
Increase motor parameter Io gradually (up to set
parameter × 1.2).
Reduce motor parameter J from the set parameter.
Reduce the speed response.
Reduce motor parameter J from the set parameter.
Set a overload limit level lower than that of the torque.
A001
H004/H204, H005/H205, H020/H220, H021/H221, H022/H222, H023/
Adjusting method
, A044/A244, F001, b040, b041 to b044, H002/H202, H003/H203,
H223, H024/H224, H050/H250, H051/H251, H052/H252
Adjustment item
H021/H221/H031
H021/H221/H031
H020/H220/H030
H023/H223/H033
H024/H224/H034
H005/H205
H024/H224/H034
b021
b041 to b044
H024/H224/H034