Mitsubishi Electric 700 Series Instruction Manual page 160

Operation selection at power failure and instantaneous power failure
4) When offline auto tuning ends, press
the monitor display of the operation panel returns to normal.
5) Set "0" in the X12 signal (Bit11), which gives a control input command through FL remote communication. Then,
change the operation mode to Network operation mode.
6) If offline auto tuning 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
Current limit (stall prevention) function was
91
activated.
Converter output voltage reached 75% of rated
92
value.
Calculation error
93
A motor is not connected.
7) When tuning is ended forcibly by pressing
constants have not been set.)
Perform an inverter reset and restart tuning.
8) When the rated power specification on the motor is 200/220V(400/440V) 60Hz, set 1.1 times the rated motor current
value in Pr.9 Electronic thermal O/L relay after tuning is completed.
NOTE
Do not change the Pr. 96 setting after completion of tuning (23). If the Pr. 96 setting is changed, tuning data is invalid.
If the Pr. 96 setting is changed, tuning must be performed again.
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.
An instantaneous power failure occurring during tuning will result in a tuning error.
After power is restored, the inverter goes into the normal operation mode.
Any alarm occurring during tuning is handled as in the ordinary mode. Note that if a fault retry has been set, retry is
ignored.
The set frequency monitor displayed during the offline auto tuning is 0Hz.
Automatic restart operation will also be performed after a reset or when a retry is made by the retry function.
When automatic restart after instantaneous power failure has been selected, the motor and machine will start
suddenly (after the reset time has elapsed) after occurrence of an instantaneous power failure.
Stay away from the motor and machine.
When you have selected automatic restart after instantaneous power failure function, apply in easily visible
places the CAUTION stickers supplied to the Instruction Manual (Basic).
When the start signal is turned OFF or
power failure, deceleration starts after Pr. 58 Restart cushion time has elapsed.
Parameters referred to
Pr. 7 Acceleration time, Pr. 21 Acceleration/deceleration time increments
Pr. 13 Starting frequency
Pr. 65, Pr. 67 to Pr. 69 Retry function
Pr. 71 Applied motor Refer to page 125
Pr. 78 Reverse rotation prevention selection
on the operation panel. This operation resets the offline auto tuning, and
Error Cause
during tuning, offline auto tuning does not end properly. (The motor
CAUTION
is pressed during the restart cushion time after instantaneous
Refer to page 119
Refer to page 158
Refer to page 167
Remedy
Set "21" in Pr. 96 and perform tuning again.
Make setting again.
Set "1" in Pr. 156.
Check for fluctuation of power supply voltage.
Check the motor wiring and make setting again.
Set the rated current of the motor in Pr. 9.
Refer to page 116
5
155