Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 525

• When offline auto tuning ends, press
the start signal (STF signal or STR signal). This operation resets the offline auto tuning, and the PU's monitor display
returns to the normal indication. (Without this operation, next operation cannot be started.)
NOTE
• The motor constants measured once during offline auto tuning are stored as parameters and their data are held until offline
auto tuning is performed again. However, the tuning data is cleared when performing All parameter clear.
• Changing Pr.71 after tuning completion will change the motor constant. For example, if the Pr.71 setting is changed to "8093"
after tuned with Pr.71 = "8090", the tuning data become invalid. To use the tuned data, set "8090" again in Pr.71.
• 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.
524
5. PARAMETERS
5.13 (C) Motor constant parameters
on the operation panel during PU operation. For External operation, turn OFF
Error cause
or turning OFF the start signal (STF or STR) during tuning, offline auto
Countermeasures
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.