Mitsubishi Electric 800 Series Instruction Manual page 525

(A) Application parameters
• Monitor is displayed on the operation panel and parameter unit during tuning as below.
status
Setting
Tuning in progress
Normal end
• 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.)
• At tuning completion, the tuning results are set in the following parameters:
Parameter
90
298
96
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 when performing all parameter clear.
• 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
91 The current limit (stall prevention) function is activated.
92 The converter output voltage fell to 75% of the rated value.
Calculation error
93
The motor is not connected.
Rotation tuning frequency setting error
(The frequency command for the tuning was given to exceed
94
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 goes into the 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. Note that even if a retry operation has been set,
retry is not performed.
• The set frequency monitor displayed during the offline auto tuning is 0 Hz.
524
PARAMETERS
Parameter unit display
READ:List
TUNE
11
STOP PU
TUNE
12
STF FWD PU
13
TUNE
COMPLETION
STF STOP PU
on the operation panel during PU operation. For External operation, turn OFF
Name
Motor constant (R1)
Frequency search gain
Auto tuning setting/status
Error cause
Operation panel display
AutoTune
TUNE
--- STOP
PREV
AutoTune
TUNE
STF
PREV
AutoTune
TUNE
Completed
STF STOP
PREV
Set "11" to 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.
Check the Pr.1 Maximum frequency and Pr.31 to
Pr.36 Frequency jump settings.
or turning OFF the start signal (STF or STR) during tuning, offline auto
12:34
11
PU
NEXT
12:34
12
FWD PU
NEXT
12:34
13
PU
NEXT
Countermeasures