Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 681 / 1218

Parameters (C) Motor constant parameters
FR-A800 5 - 479
Parameters in which tuning results are set after tuning
Tuning adjustment (Pr. 1002)
The overcurrent protective function may be activated during Lq tuning for an easily magnetically sat-
urated motor (motor with a large Lq 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 constant
●
If the motor constant is known, the motor constant 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.
First
motor Pr.
Second
motor Pr.
Name
Other than MM-CF
Pr. 96 (Pr.4 63) = 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)
μ
s
859 860
Torque current/Rated PM
motor current
 ⎯
96 463 Auto tuning setting/status
 
Tab. 5-195: Setting of motor constants after tuning