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Before operation
3) When offline auto tuning ends, press
OFF the start signal (STF signal or STR signal) once.
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.)
Do not change the Pr. 96 setting after completion of tuning (3 or 13).
If the Pr. 96 setting is changed, tuning data is invalid.
If the Pr. 96 setting is changed, tuning must be performed again.
4) If offline auto tuning ended in error (see the table below), motor constants are not set.
Perform an inverter reset and restart tuning.
Forced end
Inverter protective function operation
Current limit (stall prevention) function was activated.
Converter output voltage reached 75% of rated value.
Calculation error
A motor is not connected.
5) When tuning is ended forcibly by pressing
auto tuning does not end properly. (The motor constants have not been set.)
Perform an inverter reset and restart tuning.
6) When using the motor corresponding to the following specifications and conditions, reset Pr.9 Electronic thermal O/L
relay as below after tuning is completed.
a) When the rated power specifications of the motor is 200/220V(400/440V) 60Hz, set 1.1 times rated motor current
value in Pr.9.
b) When performing motor protection from overheat using a PTC thermistor or motor with temperature detector such
as Klixon, set "0" (motor overheat protection by the inverter is invalid) in Pr.9.
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. 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 ordinary mode. Note that if a fault retry has been set, retry is
As the motor may run slightly during offline auto tuning, fix the motor securely with a mechanical brake or make sure
that there will be no problem in safety if the motor runs. Note that if the motor runs slightly, tuning performance is
of the operation panel during PU operation. For external operation, turn
Error Cause
or turning OFF the start signal (STF or STR) during tuning, offline
Set "1" or "11" 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.


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