Troubleshooting
T
roub
leshooting
and Maintenance
6–4
The motor speed will not reach
the target frequency (desired
speed).
•
If using the analog input, is there
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
(A004)
•
Check frequency upper limit
setting (A061)
•
If using analog inputs, check
their settings (A101– A104) or
(A111–A114), or (A011–A014)
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.
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 B031 parameter (SFT
mode).
Symptom/condition
Probable Cause
Solution
