Mitsubishi Electric 800 Series Instruction Manual page 361

• During tuning, the monitor is displayed on the operation panel as follows.
Status
Setting
Tuning in progress
Normal end
• When offline auto tuning ends, press the STOP/RESET key on the operation panel during PU operation. For External
operation, 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.)
• At tuning completion, the tuning results are set in the following parameters:
Parameter
90
298
96
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.
• If offline auto tuning has ended in error, motor constants are not set.
Perform an inverter reset and restart tuning.
Error display
8 Forced end
9 Inverter protective function operation
91 The current limit (stall prevention) function is activated.
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 restart tuning.
• If the rated power supply of the motor is 200/220 V (400/440 V) 60 Hz, set the rated motor current multiplied by 1.1 in Pr.9
Electronic thermal O/L relay after tuning is complete.
• For a motor with a thermal protector or other thermal detection, set "0" (motor overheat protection by inverter invalid) in
Pr.9 to protect the motor from overheating.
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.
• The set frequency monitor displayed during the offline auto tuning is 0 Hz.
 Tuning the second motor (Pr.463)
• When one inverter switches the operation between two different motors, set the second motor in Pr.450 Second applied
motor, set Pr.463 Second motor auto tuning setting/status = "11", and perform tuning of the second motor.
360
14. (A) Application Parameters
14.9 Offline auto tuning for a frequency search
Operation panel indication
Name
Motor constant (R1)
Frequency search gain
Auto tuning setting/status
Error cause
Blinking
Countermeasures
Set "11" in Pr.96 and retry.
Make the setting again.
Set the acceleration/deceleration time longer.
Set Pr.156 Stall prevention operation selection = "1".
Check for the power supply voltage fluctuation.
Check the motor wiring and make the setting again.