Mitsubishi Electric 800 Series Instruction Manual (Function page 454

• 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 Motor constant (R1)
298 Frequency search gain
96 Auto tuning setting/status
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 PTC thermistor, 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.
Operation panel indication
Name
Error cause
LCD operation panel (FR-LU08) display
AutoTune
TUNE
--- STOP
PREV
AutoTune
TUNE
STF
PREV
Blinking
AutoTune
TUNE
Completed
STF STOP
PREV
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.
16. (A) Application Parameters
16.9 Offline auto tuning for a frequency search
11
12:34
11 12
PU
NEXT
13
12:34
12
FWD PU
NEXT
14
12:34
13
PU
NEXT
15
16
17
18
19
20
453