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Mitsubishi Electric FR-B-750 to 75K Instruction Manual Page 82

Fr-b-750 to 75k (200v class), fr-b-750 to 110k (400v class).
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3)When offline auto tuning ends, press
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.)
· Do not change the Pr. 96 setting after completion of tuning (103).
If the Pr. 96 setting is changed, tuning data is made invalid.
If the Pr. 96 setting is changed, tuning must be performed again.
4)If offline auto tuning ended in error (see the table below), motor constants are not set.
Perform an inverter reset and restart tuning.
Error Display
5)When tuning is ended forcibly by pressing
auto tuning does not end normally. (The motor constants have not been set.)
Perform an inverter reset and restart tuning.
· 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 an error retry has been set, retry is ignored.
· The set frequency monitor displayed during the offline auto tuning is 0Hz.
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.
♦ Parameters referred to ♦
Pr. 7 Acceleration time, Pr. 8 Deceleration time
Pr. 9 Electronic thermal O/L relay
Pr. 80 Motor capacity, Pr. 81 Number of motor poles
Pr. 156 Stall prevention operation selection
Pr. 178 to Pr. 189 (input terminal function selection)
Pr. 190 to Pr. 196 (output terminal function selection)
of the operation panel during PU operation. For external operation, turn
Error Cause
Forced end
Inverter protective function operation
Current limit (stall prevention) function was
Converter output voltage reached 75% of
rated value.
Calculation error
A motor is not connected.
or turning off the start signal (STF or STR) during tuning, offline
Refer to page 88
Refer to page 96
Refer to page 95
Refer to page 74
Refer to page 118
Refer to page 125
Before operating the FR-B3 series
Set "101" in Pr. 96 and perform tuning again.
Make setting again.
Increase acceleration/deceleration time.
Set "1" in Pr. 156 .
Check for fluctuation of power supply voltage.
Check the motor wiring and make setting


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