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Check first when you have a trouble
Check
points
Pr. 0 Torque boost setting is improper when V/F control is
used.
Pr. 78 Reverse rotation prevention selection is set.
Pr. 79 Operation mode selection setting is wrong.
Bias and gain (calibration parameter C2 to C7) settings
are improper.
Pr. 13 Starting frequency setting is greater than the
running frequency.
Frequency settings of various running frequency (such
as multi-speed operation) are zero.
Especially, Pr. 1 Maximum frequency is zero.
Pr. 15 Jog frequency setting is lower than Pr. 13 Starting
Parameter
frequency.
Setting
Operation mode and a writing device do not match.
Start signal operation selection is set by the Pr. 250 Stop
selection
The motor is decelerated to a stop when power failure
deceleration stop function is selected.
Automatic restart after instantaneous power failure
function or power failure stop function is activated.
(Performing overload operation during input phase loss
may cause voltage insufficiency, and that may result in
detection of power failure.)
DC feeding mode 1 or mode 2 is not selected in Pr.30
Regenerative function selection even though the DC is fed
through terminal P and N.
Load is too heavy.
Load
Shaft is locked.
348
Possible Cause
Countermeasures
Increase Pr. 0 setting by 0.5% increments while
observing the rotation of a motor.
If that makes no difference, decrease the setting.
Check the Pr. 78 setting.
Set Pr. 78 when you want to limit the motor rotation to
only one direction.
Select the operation mode which corresponds with input
methods of start command and frequency command.
Check the bias and gain (calibration parameter C2 to C7)
settings.
Set running frequency higher than Pr. 13.
The inverter does not start if the frequency setting signal
is less than the value set in Pr. 13.
Set the frequency command according to the
application.
Set Pr. 1 higher than the actual frequency used.
Set Pr. 15 Jog frequency higher than Pr. 13 Starting
frequency.
Check Pr. 79, Pr. 338, Pr. 339, Pr. 550, Pr. 551, and select
an operation mode suitable for the purpose.
Check Pr. 250 setting and connection of STF and STR
signals.
When power is restored, ensure the safety, and turn
OFF the start signal once, then turn ON again to restart.
The motor restarts when Pr. 261="2, 22".
Set Pr. 872 Input phase loss protection selection = "1"
(input phase failure protection active).
Disable the automatic restart after instantaneous
power failure function and power failure stop function.
Reduce the load.
Increase the acceleration time if the automatic restart
after instantaneous power failure function or power
failure stop function occurred during acceleration.
Set the DC feeding mode in Pr.30 Regenerative function
selection.
Reduce the load.
Inspect the machine (motor).
Refer
to
page
78
192
197
179
104
87
95
197,
206
128
158
154,
158,
164
115
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