Mitsubishi Electric FR-A820-04750-GF Instruction Manual page 112

2.2
Offline auto tuning for a PM motor (motor constant tuning)
The offline auto tuning enables the optimal operation of a PM motor.
• Automatic measurement of motor constants (offline auto tuning) enables optimal operation of motors for PM
sensorless vector control even when motor constants vary or when the wiring distance is long.
 Before performing offline auto tuning
Check the following points before performing offline auto tuning:
• The PM sensorless vector control is selected.
• A motor is connected. (Check that the motor is not rotated by an external force during tuning.)
• The maximum frequency under PM sensorless vector control is 400 Hz.
• The motor may rotate slightly even if the offline auto tuning without the motor rotating (Pr.96 Auto tuning setting/
status = "11") is selected. (It 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.)
• Tuning is not available during position control under PM sensorless vector control.
 Settings
• To perform tuning, set the following parameters about the motor.
First motor Pr. Second motor Pr.
80 453
81 454
9 51
84 457
71 450
83 456
96 463
NOTE
• Under PM sensorless vector control, tuning cannot be performed even when Pr.96 = "101". When the EM-A is set
to the applied motor, tuning cannot be performed even when Pr.96 = "1 or 101".
• Use the following parameters in the initial settings ("9999").
First motor Pr. Second motor Pr.
702 743
707 744
724 745
725 746
 Performing tuning
• Before performing tuning, check the monitor display of the operation panel or parameter unit if the inverter is in the
state ready for tuning. The motor starts by turning ON the start command while tuning is unavailable.
• In the PU operation mode, press
In the external operation mode, turn ON the start command (STF signal or STR signal). Tuning starts.
For details on the tuning procedure, refer to "5.13.4 Offline auto tuning for a PM motor (motor constants tuning)"
in the Instruction Manual (Detailed).
 Parameters updated by tuning results after tuning
First motor Pr. Second motor Pr.
90 458
717 741
96 463
Name
Motor capacity
Number of motor poles
Electronic thermal O/L relay
Rated motor frequency
Applied motor
Rated motor voltage
Auto tuning setting/status
Name
Maximum motor frequency
Motor inertia (integer)
Motor inertia (exponent)
Motor protection current level
/ on the operation panel.
Name
Motor constant (R1)
Starting resistance tuning compensation
Auto tuning setting/status
5
Setting for EM-A
Parameters for the first motor are set
by IPM parameter initialization.
Initial value (200 V)
11
Setting for EM-A
9999 (initial value)
9999 (initial value)
9999 (initial value)
Description
Resistance per phase
BCN-C22005-1008