Mitsubishi Electric 800 Series Instruction Manual page 367

 Before performing offline auto tuning
Check the following points before performing offline auto tuning.
• The PM motor control is selected.
• A motor is connected. Note that the motor should be at a stop at a tuning start. (The motor should not be rotated by the
force applied from outside during the tuning.)
• For the motor capacity, the rated motor current should be equal to or less than the inverter rated current. (It must be 0.4
kW or higher.) If a motor with substantially low rated current compared with the inverter rated current 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 motor 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") 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 may be disabled depending on the motor characteristics.
 Setting
• To perform tuning, set the following parameters about the motor.
First motor Pr.
80
81
9
84
83
71
96
*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
Motor
IPM motor
SPM motor
NOTE
• If PM motor control is performed, tuning cannot be performed even when Pr.96 = "11, 101" is set.
• For the tuning accuracy improvement, set the following parameter when the motor constant is known in advance.
First motor Pr.
702
707
724
725
*2 The setting is valid only when both of the Pr.707 (Pr.744) and Pr.724 (Pr.745) settings are other than "9999".
366
5. PARAMETERS
5.10 (C) Motor constant parameters
Second motor Pr.
453 Motor capacity
454 Number of motor poles
51 Electronic thermal O/L relay
457 Rated motor frequency
456 Rated motor voltage
450 Applied motor
463 Auto tuning setting/status
Pr.71 setting
Motor constant parameter Ω,
mH and A unit setting
8090
9090
Second motor Pr.
743 Maximum motor frequency
744 Motor inertia (integer)
745 Motor inertia (exponent)
746 Motor protection current level
Name
Motor capacity (kW)
The number of motor poles (2 to 12)
Rated motor current (A)
Rated motor frequency (Hz)
Rated motor voltage (V)
8090, 8093 (IPM motor)
9090, 9093 (SPM motor)
1
page 351.)
Motor constant parameter
internal data setting
8093 (8094)
9093 (9094)
Name
The maximum motor frequency (Hz)
Motor inertia
Jm=Pr.707  10^(- Pr.724) (kg/m
Maximum current level of the motor (%)
Setting
*1
Setting
*2
2
)