Mitsubishi Electric FR-A800 Series Instruction Manual page 555

• 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 offline auto tuning is performed without the motor rotating (Pr.96 Auto tuning setting/
status = "1 or 11"). (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.
• Tuning may be disabled depending on the motor characteristics.
 Settings
• 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".
• For tuning accuracy improvement, set the following parameters when the motor constants are known in advance.
First motor Second
Pr. motor Pr.
702 743
707 744
724 745
725 746
*1 The setting is valid only when a value other than "9999" is set in both Pr.707 (Pr.744) and Pr.724 (Pr.745).
 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.
554
5. PARAMETERS
5.13 (C) Motor constant parameters
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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
Name
Maximum motor frequency
Motor inertia (integer)
Motor inertia (exponent)
Motor protection current level
search engine
Setting for 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 528.)
Motor constant parameter
Ω, mH, and A unit setting
330
8090
9090
Setting for a PM motor other than MM-CF
Maximum motor frequency (Hz)
*1
Motor inertia
Jm = Pr.707 × 10^(-Pr.724) (kg·m
Maximum current level of the motor (%)
Setting for MM-CF
Set by the IPM parameter initialization.
(Refer to page 231.)
Initial value (200 V or 400 V)
*1
330, 333
11
Pr.71 setting
Motor constant parameter
internal data setting
333 (334)
8093 (8094)
9093 (9094)
Setting for MM-CF
9999 (initial value)
9999 (initial value)
2
)
9999 (initial value)