Mitsubishi FR-A800

(C) Motor constant parameters
448
PARAMETERS
Changing the motor constants
• If the motor constants are known, the motor constants can be set directly or set using data measured through 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 setting values are stored in the EEPROM as motor constant parameters, and three types of motor constants
can be stored.
Changing the motor constants (If setting the Pr.92 and Pr.93 motor
constants in units of mH)
•Set Pr.71 as shown below.
• Use the following formula to find the Pr.94 setting value and set a given value as the motor constant parameter.
 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.
Motor Pr.71 setting
Mitsubishi standard motor
Mitsubishi high-efficiency motor
SF-JR 0 (initial value)
SF-JR 4P 1.5 kW or lower 20
SF-HR 40
Mitsubishi constant-torque motor
SF-JRCA 4P 1
SF-HRCA 50
Mitsubishi high-performance
energy-saving motor
SF-PR 70
Vector control dedicated motor
SF-V5RU (1500 r/min series) 30
SF-V5RU (other than the 1500 r/min series) 1
The setting value of Pr.94 = (1 -
M
2
)  100(%)
L1  L2
Equivalent circuit diagram of the motor
First
motor Pr.
Second
motor Pr.
Name Setting range
Setting
increments
Initial
value
82 455
Motor excitation current
(No-load current)
0 to 500 A, 9999
 0.01 A
9999
0 to 3600 A, 9999
 0.1 A
90 458 Motor constant (R1)
0 to 50 , 9999
 0.001 
0 to 400 m, 9999 0.01 m
91 459 Motor constant (R2)
0 to 50 , 9999
 0.001 
0 to 400 m, 9999 0.01 m
92 460
Motor constant (L1)/d-axis
inductance (Ld)
0 to 6000 mH, 9999
 0.1 mH
0 to 400 mH, 9999 0.01 mH
93 461
Motor constant (L2)/q-axis
inductance (Lq)
0 to 6000 mH, 9999
 0.1 mH
0 to 400 mH, 9999 0.01 mH
94 462 Motor constant (X) 0 to 100%, 9999
0.1%

0.01%
859 860
Torque current/Rated PM motor
current
0 to 500 A, 9999
 0.01 A
0 to 3600 A, 9999 0.1 A
298 560 Frequency search gain 0 to 32767, 9999 1
L1= I1+ M: Primary inductance
L2= I2+ M: Secondary inductance
M
V
R2/S
R1 I1 I2
R1: Primary resistance
I1: Primary leakage inductance
I2: Secondary leakage inductance
M: Excitation inductance
S: Slip
R2: Secondary resistance