Mitsubishi Electric 800 Series Instruction Manual page 443

(C) Motor constant parameters
Parameters in which the tuning results are set to after tuning
First Second
motor Pr. motor Pr.
90 458 Motor constant (R1)
92 460 Motor constant (L1)/d-axis inductance (Ld)
93 461 Motor constant (L2)/q-axis inductance (Lq)
711 739 Motor Ld decay ratio
712 740 Motor Lq decay ratio
717 741 Starting resistance tuning compensation
Starting magnetic pole position detection pulse
721 742
width
859 860 Torque current/Rated PM motor current
96 463 Auto tuning setting/status
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
92 460
93 461
706 738
859 860
1412 1413

For the FR-A860-01080 or lower.

For the FR-A860-01440 or higher.
442
PARAMETERS
Name
Pr.71 setting
8090
9090
Name
Motor constant (R1)
Motor constant (L1)/d-axis
inductance (Ld)
Motor constant (L2)/q-axis
inductance (Lq)
Induced voltage constant (phi f) 0 to 5000 mV/(rad/s), 9999
Torque current/Rated PM motor
current
Motor induced voltage constant
(phi f) exponent
Description
Resistance per phase
d-axis inductance
q-axis inductance
d-axis inductance decay ratio
q-axis inductance decay ratio
When the setting value is 10000 or more:
With polarity inversion for compensation,
voltage pulse (Pr. setting minus 10000) s
Setting range
0 to 50 Ω, 9999

0 to 400 mΩ, 9999

0 to 500 mH, 9999

0 to 50 mH, 9999

0 to 500 mH, 9999

0 to 50 mH, 9999

0 to 500 A, 9999

0 to 3600 A, 9999

0 to 2, 9999
Setting
Initial value
increments
0.001 Ω

0.01 mΩ

0.01 mH

0.001 mH

0.01 mH

9999
0.001 mH

0.1 mV/(rad/s)
0.01 A

0.1 A

1