(A) Application 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. 5-208: Error display
● 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.
– 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.
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.
5 - 430
Inverter protective function operation
The current limit (stall prevention) function is
The converter output voltage fell to 75% of
the rated value.
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 "11" to Pr. 96 and retry.
Make the setting again.
Set the acceleration/deceleration time longer.
Set Pr. 156 "Stall prevention operation selection"
Check for the power supply voltage fluctuation.
Check the motor wiring and make the setting
Check the Pr. 1 "Maximum frequency "and Pr. 31
to Pr. 36 Frequency jump settings.