348
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.
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.
Pr. 79 Operation mode selection
setting is wrong.
Select the operation mode which corresponds with input
methods of start command and frequency command.
Bias and gain
(calibration parameter C2 to C7)
settings
are improper.
Check the bias and gain
(calibration parameter C2 to C7)
settings.
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
.
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.
Pr. 15 Jog frequency
setting is lower than
Pr. 13 Starting
frequency
.
Set
Pr. 15 Jog frequency
higher than
Pr. 13 Starting
frequency.
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.
Start signal operation selection is set by the
Pr. 250 Stop
selection
Check
Pr. 250
setting and connection of STF and STR
signals.
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".
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.
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
.
Load
Load is too heavy.
Reduce the load.
—
Shaft is locked.
Inspect the machine (motor).
—
Check
points
Possible Cause
Countermeasures
Refer
to
page
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