124
PARAMETERS
z 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.
Equivalent Circuit Diagram of Motor
4. Return the Pr. 77 setting to the original value.
5. Refer to the following table and set Pr. 84:
Pr. 94 setting value = (1 -
M
2
) × 100(%)
L1×L2
Parameter
Number
Name Setting Range
Setting
Increments
Factory
Setting
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
Parameter
Number
Name Setting Range
Setting
Increments
Factory
Setting
84 Rated motor frequency 50 to 120Hz 0.01Hz 60Hz
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).
L1= I1 + M: Primary inductance
L2= I2 + M: Secondary inductance
M
V
R2/S
R1 : Primary resistance
R2 : Secondary resistance
I1 : Primary leakage inductance
I2 : Secondary leakage inductance
M : Excitation inductance
S : Slip
R1 I1 I2
