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420
Check first when you have a trouble
Parameter
Setting
was pressed.
(Operation panel indication is (PS).)
During the External operation mode, check the method of
restarting from a input stop from PU.
406
Two-wire or three-wire type connection is wrong.
Check the connection.
Connect STOP signal when three-wire type is used.
236
Pr. 0 Torque boost setting is improper when V/F control 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.
146
Pr. 78 Reverse rotation prevention selection is set.
Check the Pr. 78 setting.
Set Pr. 78 when you want to limit the motor rotation to only
one direction.
308
Pr. 79 Operation mode selection setting is wrong.
Select the operation mode which corresponds with input
methods of start command and frequency command.
313
Bias and gain (calibration parameter C2 to C7) settings
are improper.
Check the bias and gain (calibration parameter C2 to C7)
settings.
294
Pr. 13 Starting frequency setting is greater than the
running frequency.
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.
175
Frequency settings of various running frequency (such
as multi-speed operation) are zero.
Especially, Pr. 1 Maximum frequency is zero.
Set the frequency command according to the application.
Set Pr. 1 higher than the actual frequency used.
157
Pr. 15 Jog frequency setting is lower than Pr. 13 Starting
frequency.
Set Pr. 15 Jog frequency higher than Pr. 13 Starting frequency.
167
The Pr.359 Encoder rotation direction setting is incorrect
under encoder feedback control or under vector control.
If the "REV" on the operation panel is lit even though the
forward-rotation command is given, set Pr. 359 ="1."
38
Operation mode and a writing device do not match.
Check Pr. 79, Pr. 338, Pr. 339, Pr. 550, Pr. 551, and select an
operation mode suitable for the purpose.
313,
322
Start signal operation selection is set by the Pr. 250 Stop
selection
Check Pr. 250 setting and connection of STF and STR
signals.
236
Inverter decelerated to a stop when power failure
deceleration stop function is selected.
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".
270
Auto tuning is being performed.
In the PU operation, press on the operation 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.)
189
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.)
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.
266,
270,
276
Load
Load is too heavy. Reduce the load. —
Shaft is locked. Inspect the machine (motor). —
Check
points
Possible Cause Countermeasures
Refer
to
page