Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 513

• The function is enabled under Advanced magnetic flux vector control, Real sensorless vector control, and 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), Mitsubishi Electric high-performance energy-serving
motor (SF-PR), or Vector control dedicated motors (SF-V5RU (1500 r/min series)), such as an induction motor of other
manufacturers, SF-JRC, or SF-TH, or with a long wiring length (30 m or longer).
• Tuning is enabled even when a load is connected to the motor.
• During offline auto tuning, the motor rotation can be locked (Pr.96 = "1") or unlocked (Pr.96 = "101"). The tuning is more
accurate when the motor can rotate (unlocked).
• 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:
• Check that a value other than "9999" is set in Pr.80 and Pr.81, and Advanced magnetic flux vector control, Real sensorless
vector control, or Vector control is selected (with Pr.800).
• Check that a motor is connected. (Check that the motor is not rotated by an external force during tuning.)
• Select a motor with the rated current equal to or less than the inverter rated 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 the offline auto tuning without motor rotation (Pr.96 Auto tuning setting/status =
"1") is selected. (The slight motor rotation does not affect the tuning performance.)
Fix the motor securely with a mechanical brake, or make sure that it is safe even if the motor rotates. (Caution is required
especially in vertical lift applications.)
• Check the following points for the offline auto tuning with motor rotation (Pr.96 Auto tuning setting/status = "101").
The torque is not sufficient during tuning.
Check that the motor can be rotated up to the speed close to the rated speed.
Check that 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.
• Make sure to connect the encoder to the motor without coaxial misalignment for Vector control. Set the speed ratio to 1:1.
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5. PARAMETERS
5.13 (C) Motor constant parameters