Mitsubishi Electric 800 Series Instruction Manual (Function page 400

• During tuning, the monitor is displayed on the operation panel as follows.
Tuning status
(1) Setting
(2) During tuning
(3) Normal completion
• When offline auto tuning ends, press the STOP/RESET key on the operation panel during PU operation. In the External
operation mode, turn OFF the start signal (STF signal or STR signal). This operation resets the offline auto tuning, and the
monitor display of the operation panel returns to normal. (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.
• When tuning is ended forcibly by pressing the STOP/RESET key or turning OFF the start signal (STF or STR) during
tuning, offline 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.
Operation panel indication
Blinking
Error cause
LCD operation panel (FR-LU08)
display
AutoTune 12:34
TUNE
1
--- STOP PU
PREV NEXT
AutoTune 12:34
TUNE
2
STF FWD PU
PREV NEXT
AutoTune 12:34
TUNE
3
Completed
STF STOP PU
PREV NEXT
Countermeasures
Set "1" in Pr.96 (Pr.463) and retry.
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.
15. (C) Motor Constant Parameters
15.3 Offline auto tuning for a PM motor (motor constant tuning)
11
12
13
14
15
16
17
18
19
20
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