Hitachi SJ100 Instruction Manual page 173

6–4
Troubleshooting
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.
No downloads
have occurred.
Inverter data
is not
correct.
A download to
the inverter was
attempted.
True for certain
A parameter
parameters
will not
change after
an edit
True for all
(reverts to
parameters
old setting).
Probable Cause
•
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 partic-
ular frequency?
•
Is the maximum frequency setting
A_04 correct?
•
Does the monitor function D_01
display the expected output
frequency?
•
Was power turned OFF after a
parameter edit but before pressing
the Store key?
•
Edits to data are permanently
stored at power down. Was the time
from power OFF to power ON less
than six seconds?
•
Was the power turned OFF within
six seconds after the display
changed from REMT to INV?
•
Is the inverter in Run Mode? Some
parameters cannot be edited during
Run Mode.
•
If you're using the [SFT] intelligent
input (software lock function)—is
the [SFT] input ON?
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 (A_04)
•
Check frequency upper limit
setting (A_61)
•
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 A_11 to A_14) 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 B_31
parameter (SFT mode).