Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 668 / 1218

(C) Motor constant parameters Parameters
5 - 466
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.
●
Use the following formula to find the Pr. 94 setting value and set a given value as the motor
constant parameter.
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
Tab. 5-184: Motor selection
The setting value of Pr. 94 = (1 –
M
2
) × 100(%)
L1 × L2
I001556E
Fig. 5-221: Equivalent circuit diagram of the motor
R1 l1 l2
M R2/S
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