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• If offline auto tuning has ended in error (see the following table), motor constants are not set.
Perform an inverter reset and perform tuning again.
Error display
8
Forced end
9
Inverter protective function operation
92
The converter output voltage fell to 75% of the rated voltage.
Calculation error.
93
The motor is not connected.
Rotation tuning frequency setting error.
(The frequency command for the tuning was given to exceed
94
the maximum frequency setting, or to be in the frequency
jump range.)
• When tuning is ended forcibly by pressing
tuning does not end properly. (The motor constants have not been set.)
Perform an inverter reset and perform tuning again.
NOTE
• An instantaneous power failure occurring during tuning will result in a tuning error.
After power is restored, the inverter starts normal operation. Therefore, when the STF (STR) signal is ON, the motor starts
forward (reverse) rotation.
• Any fault occurring during tuning is handled as in the normal operation. However, if the retry function is set, no retry is
performed even when a protective function that performs a retry is activated.
• The set frequency monitor displayed during the offline auto tuning is 0 Hz.
CAUTION
• Note that the motor may start running suddenly.
 Parameters updated by tuning results after tuning
First motor
Second
Pr.
motor Pr.
90
458
92
460
93
461
711
739
712
740
717
741
721
742
859
860
96
463
 Tuning adjustment (Pr.1002)
• The overcurrent protective function may be activated during Lq tuning for an easily magnetically saturated 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 constants
• The motor constants can be set directly when the motor constants are known in advance, or by using the data measured
during offline auto tuning.
380
5. PARAMETERS
5.10 (C) Motor constant parameters
Error cause
Name
Motor constant (R1)
Motor constant (L1)/d-axis
inductance (Ld)
Motor constant (L2)/q-axis
inductance (Lq)
Motor Ld decay ratio
Motor Lq decay ratio
Starting resistance tuning
compensation
Starting magnetic pole position
detection pulse width
Torque current/Rated PM
motor current
Auto tuning setting/status
Set Pr.96 (Pr.463)="1 or 11" and try again.
Make the setting again.
Check for the power supply voltage fluctuation.
Check the Pr.84Rated motor frequency setting.
Check the motor wiring and make the setting again.
Check the Pr.1 Maximum frequency and Pr.31 to Pr.36
Frequency jump settings.
or turning OFF the start signal (STF or STR) during tuning, offline auto
Other than MM-EFS/
MM-EFS/MM-THE4
MM-THE4
Pr.96 (Pr.463) = 11
Pr.96 (Pr.463) = 1
Countermeasures
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) μs

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