Changing The Motor Constants - Mitsubishi FR-A800 Instruction Manual

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