Mitsubishi FR-A800

(C) Motor constant parameters
PARAMETERS
459
5
GROUP
C
NOTE
• Setting "9999" disables the tuning data. The MM-CF constant is used for the IPM motor MM-CF, and the inverter internal
constant is used for a PM motor other than MM-CF.
Changing the motor constants (If setting a motor constants in the
internal data of the inverter)
•Set Pr.71 as follows.
• Set given values as the motor constant parameters. The displayed increments of the read motor constants can be changed
with Pr.684 Tuning data unit switchover.
 For the FR-A820-03160(55K) or lower and FR-A840-01800(55K) or lower.
 For the FR-A820-03800(75K) or higher and FR-A840-02160(75K) or higher.
NOTE
• As the motor constants measured in the offline auto tuning have been converted into internal data (****), refer to the following
setting example when making setting:
• Setting example: To slightly increase Pr.90 value (5%)
If Pr.90 = "2516" is displayed
The value can be calculated with "2516  1.05 = 2641.8". Therefore set Pr.90 = "2642".
(The value displayed has been converted into a value for internal use. Hence, simple addition of a given
value to the displayed value has no significance)
• Setting "9999" disables the tuning data. The MM-CF constant is used for the IPM motor MM-CF, and the inverter internal
constant is used for a PM motor other than MM-CF.
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Parameters referred to
Pr.9 Electronic thermal O/L relay page 331
Pr.71 Applied motor page 438
Pr.178 to Pr.189 (input terminal function selection) page 430
Pr.800 Control method selection page 164
Motor Pr.71 setting
IPM motor
MM-CF 333 (334)
Other than MM-CF 8093 (8094)
SPM motor 9093 (9094)
First
motor
Pr.
Second
motor
Pr.
Name
Pr.684 = 0 (initial value) Pr.684 = 1
Initial
value
Setting
range
Setting
increments
Range indication
Unit
indication
90 458 Motor constant (R1)
0 to ***, 9999 1
0 to 50 , 9999
 0.001 
9999
0 to 400 m, 9999
 0.01 m
92 460
Motor constant (L1)/d-
axis inductance (Ld)
0 to 500 mH, 9999
 0.01 mH
0 to 50 mH, 9999 0.001 mH
93 461
Motor constant (L2)/q-
axis inductance (Lq)
0 to 500 mH, 9999
 0.01 mH
0 to 50 mH, 9999 0.001 mH
706 738
Induced voltage
constant (phi f)
0 to 5000 mV/s/rad,
9999
0.1 mV/(rad/s)
859 860
Torque current/Rated
PM motor current
0 to 500 A, 9999
 0.01 A
0 to 3600 A, 9999 0.1 A