Online Auto Tuning - Mitsubishi Electric 800 Series 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 Online auto tuning
C111 selection
574 Second motor online auto
C211 tuning
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
1) Perform offline auto tuning. (Refer to
2) Check that Pr.96 Auto tuning setting/status = "3 or 103 (offline auto tuning completion)".
3) Set Pr.95 Online auto tuning selection = "1 (online auto tuning at start)".
4) Check that the following parameters are set before starting operation.
Pr.
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
80
rated current)
81 Number of motor poles

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.
5) In the PU operation mode, press
For External operation, turn ON the start command (STF signal or STR signal).
NOTE
• When performing the online auto tuning at start for a lift, consider utilization of a brake sequence function for the brake
opening timing at a start or tuning using the external terminal. The tuning is completed in approximately 500 ms at the
maximum after the start. Not enough torque may be provided during that period. Caution is required to prevent the object
from dropping. Use of the start-time tuning start (X28) signal is recommended to perform tuning. (Refer to
• Perform online auto tuning at startup when the motor is stopped.
• The online auto tuning is disabled when the MRS signal is being input, the setting speed is Pr.13 Starting frequency or
lower (V/F control, Advanced magnetic flux vector control), an inverter fault is occurring, or the inverter's startup condition is
not satisfied.
• Online auto tuning does not operate during deceleration and restart from DC injection brake operation.
• It is disabled during JOG operation.
• If automatic restart after instantaneous power failure is selected, automatic restart is prioritized. (Online auto tuning at startup
does not run during frequency search.)
If automatic restart after instantaneous power failure is used together, perform online auto tuning while stopping operation
with the X28 signal. (Refer to
• Zero current detection and output current detection are enabled during online auto tuning.
• No RUN signal is output during online auto tuning. The RUN signal is turned ON at operation startup.
• If the time between the inverter stop and restart is within 4 s, tuning is performed at startup but its result will not not applied.
444
PARAMETERS
Name Initial value
0
0
page 426.)
Description

/
page 445.)
Magnetic flux Sensorless Magnetic flux Magnetic flux Sensorless Vector Sensorless
Setting range
0
1
2
0 to 2
on the operation panel.
Vector Vector
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)
page 445.)