If offline auto tuning ended in error (see the table below), motor constants are not set. Perform
an inverter reset and restart tuning.
Pr. 96 Setting
Tab. 6-15: Parameter 96 setting
When tuning is ended forcibly by pressing the STOP/RESET key or turning off the start signal
(STF or STR) during tuning, offline autotuning does not end normally. (The motor constants
have not been set.) Perform an inverter reset and restart tuning.
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.
● 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.
● 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 ignored.
As the motor may run slightly, fix the motor securely with a mechanical brake or make
sure that there will be no problem in safety if the motor runs (caution is required
especially in elevator). Note that tuning performance is unaffected even if the motor
Inverter protective function operation
Current limit (stall prevention) function was
Converter output voltage reached 75% of
– Calculation error
– A motor is not connected.
Selection and protection of a motor
Set "1" or "11" in Pr. 96 and perform tuning
Make setting again.
Set "1" in Pr. 156.
Check for fluctuation of power supply voltage.
Check the motor wiring and make setting
Set the rated current of the motor in Pr. 9.
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