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Selection and protection of a motor
4
PARAMETERS
• To enter the Pr. 92 and Pr. 93 motor constants in [mH]
<Operating procedure>
1) Set Pr. 71 according to the motor used.
*1 For other settings of Pr. 71, refer to page 187.
2) In the parameter setting mode, read the following parameters and set desired values.
Calculate the Pr. 94 value from the following formula.
3)Refer to the following table and set Pr. 83 and Pr. 84 .
* The initial value differs according to the voltage level. (200V/400V)
Motor Pr.71 Setting *1
Mitsubishi standard
motor
Mitsubishi high
efficiency motor
SF-JR 0
SF-JR 4P 1.5kW or lower 20
SF-HR 40
Mitsubishi constant-
torque motor
SF-JRCA 4P
SF-TH (constant torque)
1
SF-HRCA 50
Vector control
dedicated motor
SF-V5RU (1500r/min series) 30
SF-V5RU (except for 1500r/min series) 14
Pr. 94 setting = (1 -
M
2
) × 100 (%)
L1
× L2
Motor equivalent circuit diagram
Parameter
Number
Name Setting Range
Setting
Increments
Initial
Value
82
Motor excitation current
(no load current)
55K or lower 0 to 500A, 9999 0.01A
9999
75K or higher 0 to 3600A, 9999 0.1A
90 Motor constant (R1)
55K or lower 0 to 50Ω, 9999 0.001Ω
9999
75K or higher 0 to 400mΩ, 9999 0.01mΩ
91 Motor constant (R2)
55K or lower 0 to 50Ω, 9999 0.001Ω
9999
75K or higher 0 to 400mΩ, 9999 0.01mΩ
92 Motor constant (L1)
55K or lower 0 to 1000mH, 9999 0.1mH
9999
75K or higher 0 to 400mH, 9999 0.01mH
93 Motor constant (L2)
55K or lower 0 to 1000mH, 9999 0.1mH
9999
75K or higher 0 to 400mH, 9999 0.01mH
94 Motor constant (X)
55K or lower 0 to 100%, 9999 0.1%
9999
75K or higher 0 to 100%, 9999 0.01%
859 Torque current
55K or lower 0 to 500A, 9999 0.01A
9999
75K or higher 0 to 3600A, 9999 0.1A
Parameter
Number
Name Setting Range
Setting
Increments
Initial
Value
83 Rated motor voltage 0 to 1000V 0.1V 200V/400V*
84 Rated motor frequency 10 to 120Hz 0.01Hz 60Hz
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
(1500r/min series), etc.) constants are used.
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