Mitsubishi Electric 800 Series Instruction Manual (Function page 394

 Changing the motor constants (when setting the Pr.92, Pr.93, and Pr.94
motor constants in units of Ω)
• Set Pr.71 as follows.
Applied motor
Standard motor
Constant-torque motor
• Set desired values as the motor constant parameters.
Iq = torque current, I rated current, I
100 =
2 2
Iq = I - I
100 0
First motor Second
Pr. motor Pr.
82 455 Motor excitation current (no load current) 0 to 500 A, 9999
90 458 Motor constant (r1)
91 459 Motor constant (r2)
92 460 Motor constant (x1)
93 461 Motor constant (x2)
94 462 Motor constant (xm)
859 860 Torque current/Rated PM motor current
298 560 Frequency search gain
Starting resistance tuning compensation
717 741
coefficient 1
Starting resistance tuning compensation
720 737
coefficient 2
NOTE
• If "wye connection" or "delta connection" is incorrectly selected in Pr.71, Advanced magnetic flux vector control, Real
sensorless vector control, and Vector control are not performed properly.
• If "9999" is set in the motor constant parameters, tuning data will be invalid and the constant values for Mitsubishi Electric
motors (SF-PR, SF-PR-SC, SF-JR, SF-HR, SF-JRCA, SF-HRCA, SF-V5RU (1500 r/min series), GM-[], GM-DZ, GM-DP, and
so on) are used.
 Tuning the second motor
• When one inverter switches the operation between two different motors, set the second motor in Pr.450 Second applied
motor. (Refer to page 380.) In the initial setting, no second motor is applied.
• Turning ON the RT signal enables the parameter settings for the second motor as follows. For the RT signal, set "3" in any
parameter from Pr.178 to Pr.189 (Input terminal function selection) to assign the function.
Function
Motor capacity
Number of motor poles
Motor excitation current
Rated motor voltage
Rated motor frequency
Motor constant (R1)
Motor constant (R2)
Motor constant (L1)/d-axis inductance (Ld)
Motor constant (L2)/q-axis inductance (Lq)
Motor constant (X)
Auto tuning setting/status
Frequency search gain
Starting resistance tuning compensation
coefficient 1
Starting resistance tuning compensation
coefficient 2
Pr.71 setting
Wye connection motor
5 6
15 16
no load current
0 =
Name
RT signal ON (second motor)
Pr.453
Pr.454
Pr.455
Pr.456
Pr.457
Pr.458
Pr.459
Pr.460
Pr.461
Pr.462
Pr.463
Pr.560
Pr.741
Pr.737
Delta connection motor
Setting range Setting increments
0.01 A
0 to 50 Ω, 9999 0.001 Ω
0 to 50 Ω, 9999 0.001 Ω
0 to 50 Ω, 9999 0.001 Ω
0 to 50 Ω, 9999 0.001 Ω
0 to 500 Ω, 9999 0.01 Ω
0 to 500 A, 9999 0.01 A
0 to 32767, 9999 1
0% to 200% 0.1%
0% to 200% 0.1%
Pr.80
Pr.81
Pr.82
Pr.83
Pr.84
Pr.90
Pr.91
Pr.92
Pr.93
Pr.94
Pr.96
Pr.298
Pr.717
Pr.720
Initial value
9999
RT signal OFF (first motor)
15. (C) Motor Constant Parameters
15.2 Offline auto tuning
11
12
13
14
15
16
17
18
19
20
393