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Symptom/condition Probable Cause Solution
• If using the analog input, is the
current or voltage at [O] or [OI]?
• Check the wiring.
• Check the potentiometer or
signal generating device.
• Is the load too heavy? • Reduce the load.
• Heavy loads activate the
overload restriction feature
(reduces output as needed).
The motor speed will not
reach the target frequency
(desired speed).
• Is the inverter internally limiting
the output frequency?
• Check max frequency setting
(A004)
• Check frequency upper limit
setting (A061)
The rotation is unstable
• Is the load fluctuation too great?
• Is the supply voltage unstable?
• Is the problem occurring at a
particular frequency?
• Increase the motor capacity
(both inverter and motor).
• Fix power supply problem.
• Change 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.
• Is the maximum frequency setting
A004 correct?
• Does the monitor function D001
display the expected output
frequency?
• Verify the V/f settings match
motor specifications.
• Make sure all scaling (such as
A011 to A014) is properly set.
• Was power turned OFF after a
parameter edit but before pressing
the Store key?
• Edit the data and press the
Store key once.
No download has
occurred
• Edits to data are permanently
stored at power down. Was the time
from power OFF to power ON less
than six seconds?
• Wait six seconds or more
before turning power OFF
after editing data.
Inverter
data us not
correct
The download
to the inverter
was attempted
• Was the power turned OFF within
six seconds after the display
changed from REMT to INV?
• Copy the data to the inverter
again, and keep power ON for
six seconds or more after
copying.
True for
certain
parameters
• Is the inverter in Run Mode? Some
parameters cannot be edited during
Run Mode.
• Put 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
• If you’re using the [SFT] intelligent
input (software lock function)—is
the [SFT] input ON?
• Change the state of the SFT
input, and check the B031
parameter (SFT mode).
6−4
Troubleshooting and
Maintenance