Hitachi L100 Instruction Manual page 129

6–4
Symptom/condition
The motor speed will not reach
the target frequency (desired
The rotation is unstable.
The RPM of the motor does not
match the inverter output
frequency setting.
Inverter data
is not
correct.
A parameter
will not
change after
an edit
(reverts to
old setting).
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Troubleshooting
•
If using the analog input, is the
current or voltage at "O" or "OI?"
•
Is the load too heavy?
speed).
•
Is the load fluctuation too great?
•
Is the supply voltage unstable?
•
Is the problem occurring at a partic-
ular frequency?
•
Is the maximum frequency setting
A04 correct?
•
Does the monitor function D01
display the expected output
frequency?
•
Was power turned off after a
parameter edit but before pressing
the Store key?
No downloads
•
Edits to data are permanently
have occurred.
stored at power down. Was the time
from power Off to power On less
than six seconds?
A download to •
Was the power turned off within six
the inverter was
seconds after the display changed
attempted.
from REMT to INV?
True for certain •
Is the inverter in Run Mode? Some
parameters
parameters cannot be edited during
Run Mode.
True for all •
If you're using the [SFT] intelligent
parameters
input (software lock function), — is
the [SFT] input on?
•
Is switch 4 (located on the back of
the remote operator copy unit) On?
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).
•
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 A11 to A14) 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 B31
parameter (SFT mode).
•
Turn the switch off.