Mitsubishi Electric 800 Series Instruction Manual page 442

• 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 in the offline auto tuning are stored as parameters and their data are held until the
offline auto tuning is performed again. However, the tuning data is cleared by performing all parameter clear.
• Changing Pr.71 after tuning completion will change the motor constant. For example, if Pr.71 = "8093" is set after tuning is
performed with Pr.71 ="8090", the tuning data becomes invalid. Set Pr.71 = "8090" again for using the tuning data.
• If offline auto tuning has ended in error (see the table below), motor constants are not set.
Perform an inverter reset and restart tuning.
Error display
8 Forced end
9 Inverter protective function operation
The converter output voltage has dropped to
92
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
94
given to exceed 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 restart tuning.
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 STF (STR) signal is ON, the motor runs in the
forward (reverse) rotation.
• Any alarm 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.
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
(C) Motor constant parameters
Countermeasures
Set Pr.96 (Pr.463) = "1" and try again.
Make the setting again.
Check for the power supply voltage fluctuation.
Check the Pr.83 Rated motor voltage 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.
441
PARAMETERS
5
GROUP
C