Sensorless Vector Control; Arbitrary Motor Parameter - Omron 3G3RX User Manual

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.

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 4-115)).
•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
Phenomenon
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
Note 1: Make sure that the carrier frequency (b083) is not lower than 2.1 kHz. If the carrier frequency is lower than
2.1 kHz, the Inverter does not operate normally.
Note 2: To use lower rank motor size than the Inverter, set a torque limit value (b041 to b044), while keeping the
value , calculated with the following formula, at 200% or lower. Otherwise, the motor may burn out.
 = Torque limit set value × (Inverter capacity) / (Motor capacity)
(Example) If the Inverter capacity is 0.75 kW and the motor capacity is 0.4 kW, the torque limit set value for  =
200%, calculated with the above formula, is as follows: Torque limit set value (b041 to b044) =  ×
(Motor capacity) / (Inverter capacity) = 200% x (0.4 kW)/(0.75 kW) = 106%
Adjusting method
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
, 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
4-2 Function Mode
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
4-116
4