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Check
points
was pressed.
(Operation panel indication is
Two-wire or three-wire type connection is wrong.
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
frequency.
The Pr.359 Encoder rotation direction setting is
Parameter
incorrect under encoder feedback control or under
Setting
vector control.
Operation mode and a writing device do not match.
Start signal operation selection is set by the Pr. 250
Stop selection
Inverter decelerated to a stop when power failure
deceleration stop function is selected.
Auto tuning is being performed.
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.)
Load is too heavy.
Load
Shaft is locked.
Possible Cause
(PS).)
Check first when you have a trouble
Countermeasures
During the External operation mode, check the method
of restarting from a
input stop from PU.
Check the connection.
Connect STOP signal when three-wire type is used.
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.
If the "REV" on the operation panel is lit even though
the forward-rotation command is given, set Pr. 359 ="1."
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.
Inverter restarts when Pr. 261="2, 12".
In the PU operation, press
panel after the offline auto tuning completes.
In the External operation, turn OFF the start signal
(STF, STR).
By this operation, offline auto tuning is cancelled, and
the monitor display on the PU goes back to normal.
(If this operation is not performed, you cannot proceed
to the next operation.)
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.
Reduce the load.
Inspect the machine (motor).
Refer
to
page
146
125
59
114
47
119
104
60
105
33
62,
129
125
126
on the operation
71
111,
126
—
—
163
5
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