Mitsubishi Electric 800 Series Instruction Manual page 440

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. 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 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")
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 Second
motor Pr. motor Pr.
80 453 Motor capacity
81 454 Number of motor poles
9 51 Electronic thermal O/L relay
84 457 Rated motor frequency
83 456 Rated motor voltage
71 450 Applied motor
96 463 Auto tuning setting/status

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
Motor constant parameter
Ω, mH and A unit setting
IPM motor
SPM motor
NOTE
• If PM sensorless vector 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 Second
motor Pr. motor Pr.
702 743 Maximum motor frequency
707 744 Motor inertia (integer)
724 745 Motor inertia (exponent)
725 746 Motor protection current level

The setting is valid only when both of the Pr.707 (Pr.744) and Pr.724 (Pr.745) settings are other than "9999".
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
Pr.71 setting
Motor constant parameter
Internal data setting
8090 8093 (8094)
9090 9093 (9094)
Name
The maximum motor frequency (Hz)
Motor inertia
Jm=Pr.707  10^(- Pr.724) (kg/m
Maximum current level of the motor (%)
(C) Motor constant parameters
Setting

page 423.)
Setting

2
)
439
PARAMETERS
5
GROUP
C