Hitachi L100 Welding System User Manual


 
Troubleshooting
Troubleshooting
and Maintenance
6–4
The motor speed will not reach
the target frequency (desired
speed).
If using the analog input, is the
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 (A_04)
Check frequency upper limit
setting (A_61)
The rotation is unstable.
Is the load fluctuation too great?
Is the supply voltage unstable?
Is the problem occurring at a partic-
ular 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
A_04 correct?
Does the monitor function D_01
display the expected output
frequency?
Verify the V/f settings match
motor specifications.
Make sure all scaling (such
as A_11 to A_14) is
properly set.
Inverter data
is not
correct.
No downloads
have occurred.
Was power turned OFF after a
parameter edit but before pressing
the Store key?
Edit the data and press the
Store key once.
Edits to data are permanently
stored at power down. Was the time
from power OFF to power ON less
than six seconds?
Wait six seconds or more
before turning power OFF
after editing data.
A download to
the inverter was
attempted.
Was the power turned OFF within
six seconds after the display
changed from REMT to INV?
Copy the data to the inverter
again, and keep power ON
for six seconds or more after
copying.
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 B_31
parameter (SFT mode).
Symptom/condition Probable Cause Solution