Symptom/condition ProbableCause Solution
xIf using the analog input, is the
current or voltage at [O] or [OI]?
xCheck the wiring.
xCheck the potentiometer or
signal generating device.
xIs the load too heavy? xReduce the load.
xHeavy loads activate the
overload restriction feature
(reduces output as needed).
The motor speed will not
reach the target frequency
(desired speed).
xIs the inverter internally limiting
the output frequency?
xCheck max frequency setting
(A004)
xCheck frequency upper limit
setting(A061)
The rotation is unstable
xIs the load fluctuation too great?
xIs the supply voltage unstable?
xIs the problem occurring at a
particular frequency?
xIncrease the motor capacity
(both inverter and motor).
xFix power supply problem.
xChange the output frequency
slightly, or use the jump
frequency setting to skip the
problem frequency.
The RPM of the motor does
not match the inverter
output frequency setting.
xIs the maximum frequency setting
A004 correct?
xDoes the monitor function D001
display the expected output
frequency?
xVerify the V/f settings match
motor specifications.
xMake sure all scaling (such as
A011 to A014) is properly set.
xWas power turned OFF after a
parameter edit but before pressing
the Store key?
xEdit the data and press the
Store key once.
No download has
occurred xEdits to data are permanently
stored at power down. Was the time
from power OFF to power ON less
than six seconds?
xWait six seconds or more
before turning power OFF
after editing data.
Inverter
data us not
correct
The download
to the inverter
was attempted
xWas the power turned OFF within
six seconds after the display
changed from REMT to INV?
xCopy the data to the inverter
again, and keep power ON for
six seconds or more after
copying.
True for
certain
parameters
xIs the inverter in Run Mode? Some
parameters cannot be edited during
Run Mode.
xPut inverter in Stop Mode
(press the Stop/reset key).
Then edit the parameter.
A
parameter
will not
change
after an
edit
(reverts to
old
setting).
True for all
parameters
xIf you’re using the [SFT] intelligent
input(software lock function)—is
the[SFT] input ON?
xChange the state of the SFT
input, and check the B031
parameter(SFT mode).

64

Troubleshooting and
Maintenance
6 4
Troubleshooting and
Maintenance