Mitsubishi Electric 800 Series Instruction Manual page 370

 Tuning adjustment (Pr.1002)
• The overcurrent protective function may be activated during Lq tuning for an easily magnetically saturated motor (motor
with a large Lg decay ratio). In such case, adjust the target flowing current used for tuning with Pr.1002 Lq tuning target
current adjustment coefficient.
 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 two types of motor constants
can be stored.
 Changing the motor constants (If setting motor constants in units of [Ω],
[mH] or [A])
• Set Pr.71 as shown below.
Motor
IPM motor
SPM motor
• Set given values as the motor constant parameters.
First Pr. Second Pr.
90 458 Motor constant (R1)
92 460 Motor constant (L1)/d-axis inductance (Ld)
93 461 Motor constant (L2)/q-axis inductance (Lq)
706 738 Induced voltage constant (phi f)
859 860 Torque current/Rated PM motor current
1412 1413 Motor induced voltage constant (phi f) exponent
*1 For the FR-F860-00680 or lower.
*2 For the FR-F860-01080 or higher.
NOTE
• Setting "9999" disables the tuning data. The inverter internal constant is used.
• To change a motor induced voltage constant of PM motors, the setting in Pr.706 Induced voltage constant (phi f) or
Pr.738 Second motor induced voltage constant (phi f) must be changed. If the constant after the change exceeds the
setting range of Pr.706 or Pr.738 (0 to 5000 mV (rad/s)), set Pr.1412 or Pr.1413 to set a value in the exponent n in the
following formula: Pr.706 (Pr.738) × 10
• When Pr.71 (Pr.450) = "8093, 8094, 9093, or 9094", or Pr.1412 (Pr.1413) = "9999", the motor induced voltage constant
is as set in Pr.706 (Pr.738). (No exponent setting)
Pr.71 setting
8090
9090
Name
n
[mV (rad/s)] to set the induced voltage constant (phi f).
Setting range
increments
*1
0 to 50 Ω, 9999 0.001 Ω
*2
0 to 400 mΩ, 9999 0.01 mΩ
*1
0 to 500 mH, 9999 0.01 mH
*2
0 to 50 mH, 9999 0.001 mH
*1
0 to 500 mH, 9999 0.01 mH
*2
0 to 50 mH, 9999 0.001 mH
0 to 5000 mV/(rad/s), 9999 0.1 mV/(rad/s)
*1
0 to 500 A, 9999 0.01 A
*2
0 to 3600 A, 9999 0.1 A
0 to 2, 9999 1
5.10 (C) Motor constant parameters
3
4
5
5
5
6
7
Setting Initial
value
9999
*1
8
*2
*1
*2
9
*1
*2
10
*1
*2
369
5. PARAMETERS