Offline Auto Tuning Function (Pr. 82 To Pr. 84, Pr. 90 To Pr. 94, Pr. 96) - Mitsubishi Electric FR-A520-2.2K Instruction Manual

Note: 1. Speed fluctuation is slightly greater than in the V/F control. (Advanced magnetic flux vector
control may not be suitable for machines which attach importance to little speed fluctuation
at low speed, e.g. grinders, lapping machines.)
2. When the surge voltage suppression filter (FR-ASF-H) is used between the inverter and
motor, output torque may reduce.
3. When the terminal functions are changed using Pr. 180 to Pr. 186, the other functions may
be affected. Confirm the functions of the corresponding terminals before making setting.
·
For adjustment of motor speed fluctuation due to load variation
Pr. 89 can be used to adjust motor speed fluctuation when the load varies. (When you have changed the
conventional model FR-A200E series for the FR-A500 series, advanced magnetic flux vector control is
effective when motor speed does not match.)
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Offline auto tuning function (Pr. 82 to Pr. 84, Pr. 90 to Pr. 94, Pr. 96)

Pr. 82 "motor exciting current"
Pr. 83 "rated motor voltage"
Pr. 84 "rated motor frequency"
Pr. 90 "motor constant (R1)"
Pr. 91 "motor constant (R2)"
Pr. 92 "motor constant (L1)"
Pr. 93 "motor constant (L2)"
Pr. 94 "motor constant (X)"
Pr. 96 "auto tuning setting/status"
When you use the advanced magnetic flux vector control, you can perform the offline auto tuning operation to
calculate motor constants automatically.
Offline auto tuning is made valid only when other values than "9999" are set in Pr. 80 and Pr. 81 to select
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the advanced magnetic flux vector control.
The offline tuning data (motor constants) can be copied to another inverter with the PU (FR-DU04/
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FR-PU04).
If the motor used is not Mitsubishi's standard motor or Mitsubishi's constant-torque motor (e.g. motor of
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another company make) or the wiring distance is long, the motor can be run with the optimum operating
characteristics by using the offline auto tuning function.
Offline auto tuning
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Automatically measures the motor constants used for advanced magnetic flux vector control.
·
Offline auto tuning can be performed with the load connected. (As the load is smaller, tuning accuracy is
higher. Tuning accuracy does not change if inertia is large.)
·
For the offline auto tuning, you can select either the motor non-rotation mode or rotation mode.
Note that when making selection for the online auto tuning, the motor-only rotation mode should be
selected.
·
You can read, write and copy the motor constants tuned by the offline auto tuning.
·
The offline auto tuning status can be monitored with the PU (FR-DU04/FR-PU04).
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Related parameters
Pr. 7 "acceleration time"
Pr. 9 "electronic overcurrent protection"
Pr. 71 "applied motor"
Pr. 80 "motor capacity"
Pr. 81 "number of motor poles"
Pr. 95 "online auto tuning selection"
Pr. 156 "stall prevention operation
selection"
105
PARAMETERS
Speed