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Offline Auto Tuning Function (pr. 82 To Pr. 84, Pr. 90 To Pr. 94, Pr. 96) - Mitsubishi Electric FR-A500 Instruction Manual

Transistorized inverter.
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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.)

4.2.38 Offline auto tuning function (Pr. 82 to Pr. 84, Pr. 90 to Pr. 94, Pr. 96)

Pr. 82 "motor excitation 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"
What is auto tuning?
(1) In the magnetic flux vector control system, the motor performance is unleashed to perform operation.
(2) Using the auto tuning function improves the operational performance of the motor.
(3) There are two ways of auto tuning: offline auto tuning and online auto tuning (Refer to page 123.).
(4) There are two ways of offline auto tuning: motor-unrotated method and motor-rotated method.
(5) Speed characteristic accuracy
Online>>offline (rotated)>offline (unrotated)>>no tuning
Related parameters
Pr. 7 "acceleration time"
Pr. 9 "electronic thermal O/L relay"
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


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