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Selection and protection of a motor
3)When offline auto tuning ends, press of the operation panel during PU operation. For External operation, turn
OFF 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.)
4)If offline auto tuning ended in error (see the table below), motor constants are not set.
Perform an inverter reset and restart tuning.
5)When tuning is ended forcibly by pressing or turning OFF the start signal (STF or STR) during tuning, offline
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.
REMARKS
· 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.
· Changing Pr. 96 setting from "3 or 103" after tuning completion will invalidate the tuning data. In this case, tune again.
Error Display Error Cause Remedy
8 Forced end
Set "1" or "101" in Pr. 96 and perform tuning
again.
9 Inverter protective function operation Make setting again.
91
Current limit (stall prevention) function was
activated.
Increase acceleration/deceleration time.
Set "1" in Pr. 156 .
92
Converter output voltage reached 75% of
rated value.
Check for fluctuation of power supply voltage.
93
Calculation error
A motor is not connected.
Check the motor wiring and make setting
again.
CAUTION
· 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.
· The set frequency monitor displayed during the offline auto tuning is 0Hz.
CAUTION
Note that the motor may start running suddenly.
When the offline auto tuning is used in vertical lift application, e.g. a lifter, it may drop due to insufficient torque.