Mitsubishi Electric FR-F800 Series Instruction Manual page 401

5.10.4 Online auto tuning
Magnetic flux Magnetic flux Magnetic flux
If online auto tuning is selected under Advanced magnetic flux 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 selection
C111
574
Second motor online auto tuning
C211
 Online auto tuning at startup (Pr.95/Pr.574 = "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.
• Under Advanced magnetic flux vector control (Pr.80 Motor capacity, Pr.81 Number of motor poles), select the online
auto tuning at startup.
• Make sure to perform offline auto tuning before performing online auto tuning.
Operating procedure
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).
Online auto tuning is enabled at the next start.
4.
Check that the following parameters are set before starting operation.
9
71
80
81
*1 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 online auto tuning at startup for a lift, consider using an external terminal. The tuning takes about 500 ms at
the most after starting. However, during this time, it is possible that not enough torque is provided and caution is required to
prevent the object from dropping. Use of the Start-time tuning start external input (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
is not performed 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.
• The RUN signal is not 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 seconds, tuning is performed at startup but its result will not be
applied.
400
5. PARAMETERS
5.10 (C) Motor constant parameters
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Name Initial value
0
0
page
Pr.
Rated motor current or electronic thermal O/L relay
Applied motor
Motor capacity (with the rated motor current equal to or less than the inverter rated
current)
Number of motor poles
page 401.)
page 401.)
search engine
Setting range
0
1
0, 1
383.)
Description
*1
/ on the operation panel.
Description
No online auto tuning
Online auto tuning is performed at startup.
Select online auto tuning for the second motor.
(The settings are the same as those in Pr.95.)