Mitsubishi Electric FR-A520-0.4K Instruction Manual page 133

To enter the Pr. 92 and Pr. 93 motor constants in [mH]
<Operating procedure>
1. Set any of the following values in Pr. 71:
•Standard motor ....................................................................................... Pr. 71 = "0"
•Constant-torque motor ............................................................................ Pr. 71 = "1"
•Mitsubishi standard motor SF-JR 4 poles (1.5kW or less) ...................... Pr. 71 = "20"
2. Set "801" in Pr. 77.
(Only when the Pr. 80 and Pr. 81 settings are other than "9999", the parameter values of the motor
constants (Pr. 90 to Pr. 94) can be displayed. Though the parameter values of other than Pr. 90 to Pr. 94
can be displayed, they are parameters for manufacturer setting and shall not be changed.)
3. In the parameter setting mode, read the following parameters and set desired values:
The setting value of Pr. 94 can be found by the following calculation.
Pr. 94 setting value = (1 -
V
Parameter
Name
Number
90 Motor constant R1
91 Motor constant R2
92 Motor constant L1
93 Motor constant L2
94 Motor constant X
4. Return the Pr. 77 setting to the original value.
5. Refer to the following table and set Pr. 84:
Parameter
Name
Number
84 Rated motor frequency
Note: 1. Pr. 90 to Pr. 94 values may be read only when the Pr. 80 and Pr. 81 settings are other than
"9999" (advanced magnetic flux vector control selected).
2. Set "9999" in Pr. 90 to Pr. 94 to use the standard motor constants (including those for the
constant-torque motor).
2
M
) × 100(%)
L1×L2
Equivalent Circuit Diagram of Motor
R1 I1 I2
R2/S
M
L1= I1 + M: Primary inductance
L2= I2 + M: Secondary inductance
Setting Range
0 to 50Ω, 9999
0 to 50Ω, 9999
0 to 1000mH, 9999
0 to 1000mH, 9999
0 to 100%, 9999
Setting Range
50 to 120Hz
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R1 : Primary resistance
R2 : Secondary resistance
I1 : Primary leakage inductance
I2 : Secondary leakage inductance
M : Excitation inductance
S : Slip
Setting Factory
Increments Setting
0.001Ω 9999
0.001Ω 9999
0.1mH 9999
0.1mH 9999
0.1% 9999
Setting Factory
Increments Setting
0.01Hz 60Hz
124
PARAMETERS