344
Check first when you have a trouble
Parameter
Setting
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.
71
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.
185
Pr. 79 Operation mode selection setting is wrong.
Select the operation mode which corresponds with input
methods of start command and frequency command.
190
Bias and gain (calibration parameter C2 to C7) settings
are improper.
Check the bias and gain (calibration parameter C2 to C7)
settings.
172
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.
97
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.
80
Pr. 15 Jog frequency setting is lower than Pr. 13 Starting
frequency.
Set Pr. 15 Jog frequency higher than Pr. 13 Starting
frequency.
88
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.
190,
199
Start signal operation selection is set by the Pr. 250 Stop
selection
Check Pr. 250 setting and connection of STF and STR
signals.
121
The motor is 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.
The motor restarts when Pr. 261="2, 22".
151
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.
147,
151,
157
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.
Set the DC feeding mode in Pr.30 Regenerative function
selection.
108
Load
Load is too heavy. Reduce the load. —
Shaft is locked. Inspect the machine (motor). —
Check
points
Possible Cause Countermeasures
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