• The function is enabled under Advanced magnetic flux vector control.
• By using the offline auto tuning function, the optimum operation characteristics are obtained for a motor other than Mitsubishi
Electric standard motors (SF-JR 0.4 kW or higher), high-efficiency motors (SF-HR 0.4 kW or higher), Mitsubishi Electric
constant-torque motors (SF-JRCA 4P, SF-HRCA 0.4 kW to 55 kW), or Mitsubishi Electric high-performance energy-serving
motor (SF-PR), such as an induction motor of other manufacturers, SF-JRC, or SF-TH, or with a long wiring length (30 m or
• Tuning is enabled even when a load is connected to the motor.
• Offline auto tuning is performed without the motor rotating (Pr.96 = "1") or with the motor rotating (Pr.96 = "101"). The tuning
is more accurate when the motor rotates.
• Reading/writing of the motor constants tuned by offline auto tuning are enabled. The offline auto tuning data (motor constants)
can be copied to another inverter using the operation panel.
• The offline auto tuning status can be monitored on the operation panel or the parameter unit.
Before performing offline auto tuning
Check the following points before performing offline auto tuning:
• A value other than "9999" is set in Pr.80 and Pr.81, and Advanced magnetic flux vector control is selected.
• A motor is connected. (Check that the motor is not rotated by an external force during tuning.)
• For the motor capacity, the rated motor current should be equal to or less than the rated inverter current. (The motor
capacity must be 0.4 kW or higher.) If a motor with substantially low rated current compared with the inverter rated current,
however, 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.
• Tuning is not available for a high-slip motor, high-speed motor, or special motor.
• The maximum frequency is 400 Hz.
• The motor may rotate slightly even if offline auto tuning is performed without the motor rotating (Pr.96 Auto tuning setting/
status = "1"). (The slight motor rotation does not affect the tuning performance.)
Fix the motor securely with a mechanical brake, or before tuning, make sure that it is safe even if the motor rotates.
(Caution is required especially in vertical lift applications.)
• Check the following points for offline auto tuning with the motor rotating (Pr.96 Auto tuning setting/status = "101").
Torque is not sufficient during tuning.
The motor can be rotated up to the speed close to the rated speed.
The mechanical brake is released.
• Offline auto tuning is not performed correctly when the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) is inserted
between the inverter and motor. Be sure to remove it before performing tuning.
• To perform tuning, set the following parameters about the motor.
Number of motor poles 9999 (V/F control)
Electronic thermal O/L
Rated motor voltage
Auto tuning setting/
The initial value differs according to the voltage class (200 V / 400 V).
5.10 (C) Motor constant parameters
9999 (V/F control)
200 V / 400 V
0 (standard motor)
Set the motor capacity (kW).
Set the number of motor poles (2 to 12).
Set the rated motor current (A).
Set the rated motor voltage (V) printed on the motor's rating plate.
Set the rated motor frequency (Hz).
When the setting is "9999", the Pr.3 Base frequency setting is used.
Set this parameter according to the motor.
Three types of motor constant setting ranges, units and tuning data can
be stored according to settings.
Set "1" or "101".
1: Tuning is performed without the motor rotating. (Excitation noise
occurs at this point.)
101: Tuning is performed with the motor rotating. The motor can rotate
up to the speed near the rated motor frequency.