Hitachi X200-002SFE/NFU Instruction Manuals page 207

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