(C) Motor constant parameters
● If offline auto tuning has ended in error (see the table below), motor constants are not set. Perform
an inverter reset and restart tuning.
Tab. 5-138: Error display of offline auto tuning
● When tuning is ended forcibly by pressing STOP/RESET key or turning OFF the start signal (STF or
STR) during tuning, offline auto tuning does not end properly. (The motor constants have not
Perform an inverter reset and restart tuning.
● If using a motor falling under the following conditions, set the value of Pr. 9 "Electronic thermal
O/L relay" as shown below after tuning is complete.
– 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.
– If using a motor with a temperature detector such as PTC thermistor and Klixon and performs
motor overheat protection, set Pr. 9 = "0" (disables the motor overheat protection feature of
An instantaneous power failure occurring during tuning will result in a tuning error. After power is
restored, the inverter starts 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
● Note that the motor may start running suddenly.
● For the offline auto tuning in vertical lift applications, etc., caution is required to avoid falling
due to insufficient torque.
5 - 310
Inverter protective function operation
The current limit (stall prevention) function is
The converter output voltage has dropped to
75% of the rated voltage.
The motor is not connected.
Rotation tuning frequency setting error
(The frequency command for the tuning was
given to exceed the maximum frequency
setting, or to be in the frequency jump
Set Pr. 96 = "1" or "101" and try again.
Make the setting again.
Set the acceleration/deceleration time longer.
Set Pr. 156 = "1".
Check for the power supply voltage fluctuation.
Check the Pr. 84 "Rated motor frequency" setting.
Check the Pr. 83 and Pr. 84 settings.
Check the motor wiring and make the setting
Check the Pr. 1 "Maximum frequency "and Pr. 31
to Pr. 36 Frequency jump settings.