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Selection and protection of a motor
To enter the Pr. 90 to Pr. 94 motor constants in [mH]
<Operating procedure>
1) Set Pr. 71 according to the motor used.
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.
Motor Pr.71 Setting ∗1
Mitsubishi standard motor
Mitsubishi high efficiency motor
SF-JR 0
SF-HR 40
Mitsubishi constant-torque motor
SF-JRCA 4P 1
SF-HRCA 50
∗1 For other settings of Pr. 71, refer to page 125.
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)
0 to 500A, 9999 0.01A 9999
90 Motor constant (R1) 0 to 50Ω, 9999 0.001Ω 9999
91 Motor constant (R2) 0 to 50Ω, 9999 0.001Ω 9999
92 Motor constant (L1) 0 to 1000mH, 9999 0.1mH 9999
93 Motor constant (L2) 0 to 1000mH, 9999 0.1mH 9999
94 Motor constant (X) 0 to 100%, 9999 0.1% 9999
859 Torque current 0 to 500A, 9999 0.01A 9999
Parameter
Number
Name Setting Range
Setting
Increments
Initial Value
83 Rated motor voltage 0 to 1000V 0.1V
200V class 200V
400V class 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) constants are used.
Parameters referred to
Pr. 7 Acceleration time, Pr. 8 Deceleration time Refer to page 116
Pr. 9 Electronic thermal O/L relay Refer to page 123
Pr. 71 Applied motor Refer to page 125
Pr. 80 Motor capacity, Pr. 81 Number of motor poles Refer to page 93
Pr. 156 Stall prevention operation selection Refer to page 101
Pr. 800 Control method selection Refer to page 93
M
V
R2/S
R1 I1 I2
L1 = I1 + M:
L2 = I2 + M:
R1:
R2: Secondary resistance
I1:
I2:
M:
S: Slip
Primary inductance
Secondary inductance
Primary resistance
Primary leakage inductance
Secondary leakage inductance
Excitation inductance