Mitsubishi Electric 800 Series Instruction Manual page 360

 Changing the motor constants
• If the motor constants are known, the motor constants can be set directly or set using data measured through offline auto
tuning.
• According to the Pr.71 (Pr.450) setting, the range of the motor constant parameter setting values and units can be
changed. The setting values are stored in the EEPROM as motor constant parameters, and three types of motor constants
can be stored.
 Changing the motor constants (If setting the Pr.92 and Pr.93 motor
constants in units of mH)
• Set Pr.71 as shown below.
Motor
Standard motor
Constant-torque motor
• Use the following formula to find the Pr.94 setting value and set a given value as the motor constant parameter.
The setting value of Pr.94 = （1 -
• Equivalent circuit diagram of the motor
R1 I1 I2
R2/S
V M
L1= I1+ M: Primary inductance
L2= I2+ M: Secondary inductance
First Second
motor Pr. motor Pr.
82 455 Motor excitation current
(No-load current)
90 458 Motor constant (R1)
91 459 Motor constant (R2)
92 460 Motor constant (L1)/d-axis
inductance (Ld)
93 461 Motor constant (L2)/q-axis
inductance (Lq)
94 462 Motor constant (X)
859 860 Torque current/Rated PM motor
current
298 560 Frequency search gain
*1 For the FR-F860-00680 or lower.
*2 For the FR-F860-01080 or higher.
NOTE
• If "9999" is set, tuning data will be invalid and the motor constant values for standard motors are used.
Pr.71 setting
0 (initial value)
1
2
M
）×100(％)
L1×L2
R1: Primary resistance
R2: Secondary resistance
I1: Primary leakage inductance
I2: Secondary leakage inductance
M: Excitation inductance
S: Slip
Name
0 to 500 A, 9999
0 to 3600 A, 9999
0 to 50 Ω, 9999
0 to 400 mΩ, 9999
0 to 50 Ω, 9999
0 to 400 mΩ, 9999
0 to 6000 mH, 9999
0 to 400 mH, 9999
0 to 6000 mH, 9999
0 to 400 mH, 9999
0 to 100%, 9999
0 to 500 A, 9999
0 to 3600 A, 9999
0 to 32767, 9999
Setting range Setting increments
*1 *1
0.01 A
*2 *2
0.1 A
*1 *1
0.001 Ω
*2
0.01 mΩ
*1 *1
0.001 Ω
*2
0.01 mΩ
*1 *1
0.1 mH
*2
0.01 mH
*1 *1
0.1 mH
*2
0.01 mH
*1
0.1%
*2
0.01%
*1 *1
0.01 A
*2 *2
0.1 A
1
5.10 (C) Motor constant parameters
Initial value
9999
*2
*2
*2
*2
5. PARAMETERS
3
4
5
5
5
6
7
8
9
10
359