Mitsubishi Electric 800 Series Instruction Manual page 324

 Parameters updated by tuning results after tuning
First Second
motor Pr. motor Pr.
90 458 Motor constant (R1)
92 460 Motor constant (L1)/d-axis inductance (Ld)
93 461 Motor constant (L2)/q-axis inductance (Lq)
711 739 Motor Ld decay ratio
712 740 Motor Lq decay ratio
717 741 Starting resistance tuning compensation coefficient 1
721 742 Starting magnetic pole position detection pulse width
859 860 Torque current/Rated PM motor current
96 463 Auto tuning setting/status
 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 Pr.71 setting
IPM motor 8090
SPM motor 9090
• Set desired values as the motor constant parameters.
First Second
motor Pr. motor Pr.
90 458 Motor constant (R1)
92 460 Motor constant (L1)/d-axis inductance (Ld)
93 461 Motor constant (L2)/q-axis inductance (Lq)
706 738 Induced voltage constant (phi f)
859 860 Torque current/Rated PM motor current
1412 1413 Motor induced voltage constant (phi f) exponent
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)
Name
Name
0 to 50 Ω, 9999
0 to 500 mH, 9999
0 to 500 mH, 9999
0 to 5000 mV (rad/s), 9999 0.1 mV (rad/s)
0 to 500 A, 9999
0 to 2, 9999
13.3 Offline auto tuning for a PM motor (motor constant tuning)
Description
Resistance per phase
d-axis inductance
q-axis inductance
d-axis inductance decay ratio
q-axis inductance decay ratio
Setting
Setting range
increments
0.001 Ω
0.01 mH
0.01 mH
0.01 A
1
13.(C) Motor Constant Parameters
11
12
13
14
15
16
17
18
19
20
Initial value
9999
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