Mitsubishi FR-A800

(C) Motor constant parameters
458
PARAMETERS
Parameters in which the tuning results are set to after tuning
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 [],
[mH] or [A])
•Set Pr.71 as shown below.
• Set given values as the motor constant parameters.
 For the FR-A820-03160(55K) or lower and FR-A840-01800(55K)or lower.
 For the FR-A820-03800(75K) or higher and FR-A840-02160(75K)or higher.
First
motor Pr.
Second
motor Pr.
Name
Other than MM-CF
Pr.96 (Pr.463) = 1
V/F control or MM-CF
Pr.96 (Pr.463) = 11
Description
90 458 Motor constant (R1)  Resistance per phase
92 460
Motor constant (L1)/d-axis
inductance (Ld)
  d-axis inductance
93 461
Motor constant (L2)/q-axis
inductance (Lq)
  q-axis inductance
711 739 Motor Ld decay ratio  
d-axis inductance decay
ratio
712 740 Motor Lq decay ratio  
q-axis inductance decay
ratio
717 741
Starting resistance tuning
compensation

721 742
Starting magnetic pole position
detection pulse width
 
When the setting value is
10000 or more: With
polarity inversion for
compensation, voltage
pulse (Pr. setting minus
10000) s
859 860
Torque current/Rated PM motor
current
 
96 463 Auto tuning setting/status 
Motor Pr.71 setting
IPM motor
MM-CF 330
Other than MM-CF 8090
SPM motor 9090
First Pr. Second Pr. Name Setting range
Setting
increments
Initial value
90 458 Motor constant (R1)
0 to 50 , 9999
 0.001 
9999
0 to 400 m, 9999
 0.01 m
92 460
Motor constant (L1)/d-axis
inductance (Ld)
0 to 500 mH, 9999
 0.01 mH
0 to 50 mH, 9999 0.001 mH
93 461
Motor constant (L2)/q-axis
inductance (Lq)
0 to 500 mH, 9999
 0.01 mH
0 to 50 mH, 9999 0.001 mH
706 738 Induced voltage constant (phi f) 0 to 5000 mV/(rad/s), 9999 0.1 mV/(rad/s)
859 860
Torque current/Rated PM motor
current
0 to 500 A, 9999
 0.01 A
0 to 3600 A, 9999 0.1 A