Online Auto Tuning - Mitsubishi Electric FR-A820-00046 Instruction Manual

(C) Motor constant parameters
5.13.4

Online auto tuning

If online auto tuning is selected under Advanced magnetic flux vector control, Real sensorless vector
control or vector control, favorable torque accuracy is retained by adjusting temperature even when
the resistance value varies due to increase in the motor temperature.
Pr.
95
C111
574
C211
Performing online auto tuning at startup (setting value "1")
● By promptly tuning the motor status at startup, accurate operation without being affected by
motor temperature is achieved. Also high torque can be provided at very low speed and stable
operation is possible.
● When using Advanced magnetic flux vector control (Pr. 80 "Motor capacity," Pr. 81 "Number of
motor poles" or Real sensorless vector control (Pr. 80, Pr. 81, Pr. 800 "Control method selection"),
select the online auto tuning at start.
● Make sure to perform offline auto tuning before performing online auto tuning.
● Operation method
Perform offline auto tuning. (Refer to page 5-72.)
Check that Pr. 96 "Auto tuning setting/status" = "3 or 103 (offline auto tuning completion)".
Set Pr. 95 "Online auto tuning selection" = "1 (online auto tuning at start)".
Check that the following parameters are set before starting operation.
Tab. 5-200: Related Parameters
If a motor with substantially low rated current compared with the inverter rated current is used,
speed and torque accuracies may deteriorate due to torque ripples, etc. Set the rated motor
current to about 40% or higher of the inverter rated current.
In the PU operation mode, press FWD/REV key on the operation panel.
For External operation, turn ON the start command (STF signal or STR signal).
5 - 482
Magnetic flux Sensorless Sensorless Sensorless Vector
Magnetic flux Magnetic flux
Name Initial value
Online auto tuning
selection
Second motor online
auto tuning
Pr. Description
9 Uses both rated motor current and electronic thermal O/L relay.
71 Applicable motor
Motor capacity (with the rated motor current equal to or lower than the inverter rated
80
current)
81 Number of motor poles
Vector Vector
Setting range
0
1
0
2
0 0 to 2
Parameters
Description
Do not perform online auto tuning
Perform online auto tuning at startup
Magnetic flux observer (tuning always)
Select online auto tuning for the second
motor. (same as Pr. 95)