Mitsubishi Electric FR-A720-0.4K Instruction Manual page 200

Selection and protection of a motor
• To enter the Pr. 92 and Pr. 93 motor constants in [mH]
<Operating procedure>
1) Set Pr. 71 according to the motor used.
Mitsubishi standard
motor
Mitsubishi high
efficiency motor
Mitsubishi constant-
torque motor
Vector control
dedicated motor
*1 For other settings of Pr. 71, refer to the page 180.
2) In the parameter setting mode, read the following parameters and set desired values.
Calculate the Pr. 94 value from the following formula.
Pr. 94 setting = (1 -
R1 I1
V
M
L1= I1+ M: Primary inductance
L2= I2+ M: Secondary inductance
Motor equivalent circuit diagram
Parameter
Number
Motor excitation current
82
(no load current)
90 Motor constant (R1)
91 Motor constant (R2)
92 Motor constant (L1)
93 Motor constant (L2)
94 Motor constant (X)
859 Torque current
3)Refer to the following table and set Pr. 83 and Pr. 84 .
Parameter
Number
83 Motor rated voltage
84 Rated motor frequency
* The initial value differs according to the voltage level. (200V/400V)
REMARKS
· When "9999" is set in Pr. 82, Pr. 90 to Pr. 94, Pr. 859, Mitsubishi motor (SF-JR, SF-HR,SF-JRCA, SF-HRCA, SF-V5RU)
constants are used.
190
Motor
SF-JR
SF-JR 4P 1.5kW or less
SF-HR
SF-JRCA 4P
SF-TH (constant torque)
SF-HRCA 4P
SF-V5RU
2
M
×
) 100 (%)
×
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
55K or less
75K or more
55K or less
75K or more
55K or less
75K or more
55K or less
75K or more
55K or less
75K or more
55K or less
75K or more
55K or less
75K or more
Name
Pr.71 Setting
0
20
40
1
50
30
Setting Range
0 to 500A, 9999
0 to 3600A, 9999
0 to 50Ω, 9999
0 to 400mΩ, 9999
0 to 50Ω, 9999
0 to 400mΩ, 9999
0 to 1000mH, 9999
0 to 400mH, 9999
0 to 1000mH, 9999
0 to 400mH, 9999
0 to 100%, 9999
0 to 100%, 9999
0 to 500A, 9999
0 to 3600A, 9999
Setting Range
0 to 1000V
10 to 120Hz
Setting
Increments
0.01A
0.1A
0.001Ω
0.01mΩ
0.001Ω
0.01mΩ
0.1mH
0.01mH
0.1mH
0.01mH
0.1%
0.01%
0.01A
0.1A
Setting Initial
Increments Value
0.1V 200V/400V
0.01Hz 60Hz
Initial
Value
9999
9999
9999
9999
9999
9999
9999