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Troubleshooting
Troubleshooting
and Maintenance
6–4
The motor speed will not reach
the target frequency (desired
speed).
• 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).
• Is the inverter internally limiting
the output frequency?
• Check max frequency
setting (A_04)
• Check frequency upper limit
setting (A_61)
The rotation is unstable.
• Is the load fluctuation too great?
• Is the supply voltage unstable?
• Is the problem occurring at a partic-
ular 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
A_04 correct?
• Does the monitor function D_01
display the expected output
frequency?
• Verify the V/f settings match
motor specifications.
• Make sure all scaling (such
as A_11 to A_14) is
properly set.
Inverter data
is not
correct.
No downloads
have occurred.
• Was power turned OFF after a
parameter edit but before pressing
the Store key?
• Edit the data and press the
Store key once.
• 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.
A 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.
A parameter
will not
change after
an edit
(reverts to
old setting).
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.
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 B_31
parameter (SFT mode).
Symptom/condition Probable Cause Solution