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