Mitsubishi Electric 800 Series Instruction Manual (Function page 401

 Parameters updated by tuning results after tuning
First Second
motor Pr. motor Pr.
90 458
92 460
93 461
711 739
712 740
717 741
721 742
859 860
96 463
 Tuning adjustment (Pr.1002)
• The overcurrent protective function may be activated during Lq tuning for an easily magnetically saturated motor (motor
with a large Lq decay ratio). In such case, adjust the target flowing current used for tuning with Pr.1002 Lq tuning target
current adjustment coefficient.
 Changing the motor constants
• The motor constants can be set directly when the motor constants are known in advance, or by using the data measured
during offline auto tuning.
• According to the Pr.71 (Pr.450) setting, the range of the motor constant parameter setting values and units can be
changed. The changed settings are stored in the EEPROM as the motor constant parameters.
 Changing the motor constants (when setting motor constants in units of
Ω, mH, or A)
• Set Pr.71 as follows.
Motor
IPM motor
SPM motor
• Set desired values as the motor constant parameters.
First Second
motor Pr. motor Pr.
90 458
92 460
93 461
706 738
859 860
1412 1413
NOTE
• If "9999" is set in the motor constant parameters, tuning data will be invalid and the inverter internal constant is used.
• To change a motor induced voltage constant of PM motors, the setting in Pr.706 Induced voltage constant (phi f) or Pr.738
Second motor induced voltage constant (phi f) must be changed. If the constant after the change exceeds the setting range
of Pr.706 or Pr.738 (0 to 5000 mV (rad/s)), set Pr.1412 Motor induced voltage constant (phi f) exponent or Pr.1413
Second motor induced voltage constant (phi f) exponent. Set a value in the exponent n in the formula, Pr.706 (Pr.738) ×
n
10 [mV (rad/s)], to set the induced voltage constant (phi f).
• When Pr.71 (Pr.450) = "8093 or 9093", or Pr.1412 (Pr.1413) = "9999", the motor induced voltage constant is as set in Pr.706
(Pr.738). (No exponent setting)
400
15. (C) Motor Constant Parameters
15.3 Offline auto tuning for a PM motor (motor constant tuning)
Name
Motor constant (R1)
Motor constant (L1)/d-axis inductance (Ld)
Motor constant (L2)/q-axis inductance (Lq)
Motor Ld decay ratio
Motor Lq decay ratio
Starting resistance tuning compensation coefficient 1
Starting magnetic pole position detection pulse width
Torque current/Rated PM motor current
Auto tuning setting/status
Pr.71 setting
8090
9090
Name
Motor constant (R1)
Motor constant (L1)/d-axis inductance (Ld)
Motor constant (L2)/q-axis inductance (Lq)
Induced voltage constant (phi f)
Torque current/Rated PM motor current
Motor induced voltage constant (phi f) exponent
Description
Resistance per phase
d-axis inductance
q-axis inductance
d-axis inductance decay ratio
q-axis inductance decay ratio
Setting range
increments
0 to 50 Ω, 9999 0.001 Ω
0 to 500 mH, 9999 0.01 mH
0 to 500 mH, 9999 0.01 mH
0 to 5000 mV (rad/s), 9999 0.1 mV (rad/s)
0 to 500 A, 9999 0.01 A
0 to 2, 9999 1
Setting
Initial value
9999