Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 523

*3 For the FR-A820-03800(75K) or higher, and FR-A840-02160(75K) or higher.
*4 The initial value differs according to the voltage class (200 V / 400 V).
*5 The setting range and unit change according to the Pr.71 (Pr.450) setting.
• The settings are valid under PM sensorless vector control.
• The offline auto tuning enables the operation with SPM motors and IPM motors other than MM-CF. (When a PM motor other
than the IPM motor MM-CF is used, always perform offline auto tuning.)
• Tuning is enabled even when a load is connected to the motor.
• 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 PM sensorless vector control is selected.
• Check that a motor is connected. (Check that the motor is not rotated by an external force during tuning.)
• The rated motor current should be 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.
• The maximum frequency under PM sensorless vector control is 400 Hz.
• The motor may rotate slightly even if the offline auto tuning without motor rotation (Pr.96 Auto tuning setting/status = "1
or 11") is selected. (It 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.)
• Tuning is not available during position control under PM sensorless vector control.
• Tuning may be disabled depending on the motor characteristics.
 Setting
• To perform tuning, set the following parameters about the motor.
First motor Second
Pr. motor Pr.
80 453
81 454
9 51
84 457
83 456
71 450
96 463
*1 Set Pr.71 Applied motor according to the motor to be used. According to the Pr.71 setting, the range of the motor constant parameter setting
values and units can be changed. (For other setting values of Pr.71, refer to
IPM motor
SPM motor
NOTE
• Under PM sensorless vector control, tuning cannot be performed even when Pr.96 = "101". When the MM-CF is set to the
applied motor, tuning cannot be performed even when Pr.96 = "1 or 101".
522
5. PARAMETERS
5.13 (C) Motor constant parameters
Name
Motor capacity
Number of motor poles
Electronic thermal O/L relay
Rated motor frequency
Rated motor voltage
Applied motor
Auto tuning setting/status
Motor
MM-CF
Other than MM-CF
Driving a PM motor
other than MM-CF
Motor capacity (kW)
Number of motor poles (2 to 12)
Rated motor current (A)
Rated motor frequency (Hz)
Rated motor voltage (V)
8090, 8093 (IPM motor)
*1
9090, 9093 (SPM motor)
1
page 505.)
Motor constant parameter
Ω, mH, and A unit setting
330
8090
9090
Setting for
MM-CF
Set by the IPM parameter initialization.
(Refer to page 225.)
Rated motor voltage (V)
written on the rating plate
*1
330, 333
11
Pr.71 setting
Motor constant parameter
internal data setting
333 (334)
8093 (8094)
9093 (9094)