Online Auto Tuning (Pr. 95, Pr. 574) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.13.4 Online auto tuning (Pr. 95, Pr. 574)

When online auto tuning is selected under Advanced magnetic flux vector control, Real sensorless vector control
or vector control, excellent torque accuracy is provided by temperature compensation even if the secondary
resistance value of the motor varies with the rise of the motor temperature.
Parameter
Name
Number
Online auto tuning
95
selection
Second motor online
574
auto tuning
(1) Start-time online auto tuning (Pr. 95 = "1")
· By quickly tuning the motor constants at a start, high accuracy operation unaffected by the motor temperature and
stable operation with high torque down to ultra low speed can be performed.
· Make sure Advanced magnetic flux vector control (Pr. 80, Pr. 81), Real sensorless vector control or vector control (Pr.
800 ) is selected.
· Before performing online auto tuning, perform offline auto tuning without fail.
<Operation method>
1) Refer to page 189 to perform offline auto tuning.
2) Check that "3" or "103" (offline auto tuning completion) is set in Pr. 96 Auto tuning setting/status.
3) Set "1" (start-time online auto tuning) in Pr. 95 Online auto tuning selection.
Online auto tuning is performed from the next starting.
4) Before starting operation, check that the following parameters have been set.
Parameter
Number
9 Used as rated motor current and electronic thermal relay parameters.
71 Applied motor
Motor capacity (down to one rank lower than the inverter capacity, note
80
that the capacity should be 0.4kW or higher)
81 Number of motor poles
5) When performing PU operation, press
For External operation, turn ON the run command (STF signal or STR signal).
CAUTION
· For using start-time online auto tuning in elevator, examine the utilization of a brake sequence for the brake opening timing at a
start. Though the tuning ends in about a maximum of 500ms after a start, torque is not provided fully during that period.
Therefore, note that there may be a possibility of drop due to gravity.
It is recommended to perform tuning using a start time tuning signal (X28). (Refer to page 201.)
Magnetic flux Magnetic flux Magnetic flux
Initial
Setting Range
Value
0
1
0
2
0 0, 1
Description
/ of the operation panel.
Selection and protection of a motor
Sensorless Sensorless Sensorless Vector Vector Vector
Description
Online auto tuning is not performed
Start-time online auto tuning
Magnetic flux observer (normal tuning)
Select the second motor online auto tuning.
(same as Pr. 95)
4
199