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Operation selection at power failure and instantaneous power failure
4
PARAMETERS
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.
Error
Display
Error Cause Remedy
8 Forced end Set "21" in Pr. 96 and perform tuning again.
9 Inverter protective function operation Make setting again.
91
Current limit (stall prevention) function was
activated.
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.
Set the rated current of the motor in Pr. 9.
NOTE
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.
The set frequency monitor displayed during the offline auto tuning is 0Hz.
Changing the terminal assignment using Pr.178 to Pr.182 (input terminal function selection) may affect the other functions.
Make setting after confirming the function of each terminal.
The SU and FU signals are not output during a restart. They are output after the restart cushion time has elapsed.
Automatic restart operation will also be performed after a reset or when a retry is made by the retry function.
CAUTION
When automatic restart after instantaneous power failure has been selected, the motor and machine will start
suddenly (after the reset time has elapsed) after occurrence of an instantaneous power failure.
Stay away from the motor and machine.
When you have selected automatic restart after instantaneous power failure function, apply in easily visible
places the CAUTION stickers supplied to the Installation guideline.
When the start signal is turned off or is pressed during the restart cushion time after instantaneous
power failure, deceleration starts after Pr. 58 Restart cushion time has elapsed.
Parameters referred to
Pr. 7 Acceleration time Refer to page 96
Pr. 13 Starting frequency Refer to page 98
Pr. 65, Pr. 67 to Pr. 69 Retry function Refer to page 144
Pr. 71 Applied motor Refer to page 103
Pr. 78 Reverse rotation prevention selection Refer to page 162
Pr. 178 to Pr. 182 (input terminal function selection) Refer to page 113