Mitsubishi Electric FR-A820-00046 Instruction Manual page 668

(C) Motor constant parameters
Changing the motor constant
● If the motor constant is known, the motor constant 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 constant (if setting the Pr. 92 and Pr. 93 motor constants in units of mH)
● Set Pr. 71 as shown below.
Motor
Mitsubishi standard motor
Mitsubishi high-efficiency motor
Mitsubishi constant-torque motor
Mitsubishi high-performance
energy-saving motor
Vector control dedicated motor
Tab. 5-184: Motor selection
● 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 –
Fig. 5-221:
5 - 466
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
R1 l1 l2
M R2/S
Equivalent circuit diagram of the motor
) × 100(%)
R1: Primary resistance
R2: Secondary resistance
l1: Primary leakage inductance
l2: Secondary leakage inductance
M: Excitation inductance
S: Slip
L1 = l1 + M: Primary inductance
L2 = l2 + M: Secondary inductance
Parameters
Pr. 71 setting
0 (initial value)
20
40
1
50
70
30
1
I001556E