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Operation Method; High Accuracy Operation Unaffected By The Motor Temperature (online Auto Tuning) (pr. 95) - Mitsubishi Electric FR-A701 Instrucion Manual

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Before operation
4.3.11 High accuracy operation unaffected by the motor temperature
(online auto tuning) (Pr. 95)
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.
Online auto tuning
(1) Start-time online auto tuning (setting is "1")
· By quickly tuning the motor constants at a start, high accuracy operation unaffacted 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. (Refer to page 63.)
· Before performing online auto tuning, perform offline auto tuning without fail.
<Operation method>
1) Check that "3" or "103" (offline auto tuning completion) is set in Pr. 96 Auto tuning setting/status.
2) Set "1" (start-time online auto tuning) in Pr. 95 Online auto tuning selection.
Online auto tuning is performed from the next starting.
3) When performing PU operation, press
For external operation, turn on the run command (STF signal or STR signal).
· 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 chapter 4 of
(2) Magnetic flux observer (normal tuning) (setting value is "2")
· When exercising vector control using a motor with encoder, it is effective for torque accuracy improvement.
The current flowing in the motor and the inverter output voltage are used to estimate/observe the magnetic flux in
the motor.
The magnetic flux of the motor is always (including during operation) detected with high accuracy so that an
excellent characteristic is provided regardless of the change in the temperature of the secondary resistance.
· Vector control (Pr. 80, Pr. 81, Pr. 800) should be selected. (Refer to page 75.)
· For the SF-V5RU, SF-JR (with encoder), SF-HR (with encoder), SF-JRCA (with encoder) or SF-HRCA (with encoder), it is not
necessary to perform offline auto tuning to select adaptive magnetic flux observer. (Note that it is necessary to perform offline
auto tuning (non-rotation mode) for the wiring length resistance to be reflected on the control when the wiring length is long
(30m or longer as reference).
· Online auto tuning does not operate if the MRS signal is input, if the preset speed is less than the Pr. 13 Starting frequency (V/F
control or advanced magnetic flux vector control), or if the starting conditions of the inverter are not satisfied, e.g. inverter error.
· Online auto tuning does not operate during deceleration or at a restart during DC brake operation.
· Invalid for jog operation.
· Automatic restart after instantaneous power failure overrides when automatic restart after instantaneous power failure is selected.
(Start-time online auto tuning is not performed at frequency search.)
Perform online auto tuning at a stop with the X28 signal when using automatic restart after instantaneous power failure together.
(Refer to chapter 4 of
· Zero current detection and output current detection are valid during online auto tuning.
· The RUN signal is not output during online auto tuning. The RUN signal turns on at a start.
· If the period from an inverter stop to a restart is within 4s, start-time tuning is performed but the tuning results are not reflected.
Magnetic flux
Magnetic flux
Magnetic flux
the instruction manual (applied) for details.)
Setting Range
Online auto tuning is not performed
Start-time online auto tuning
Magnetic flux observer (normal tuning)
of the operation panel.
the instruction manual


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