Hitachi SJ300-037HFE 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 there
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
(A004)
Check frequency upper limit
setting (A061)
If using analog inputs, check
their settings (A101– A104)
or (A111–A114), or (A011–
A014)
The rotation is unstable.
Is the load fluctuation too great?
Is the supply voltage unstable?
Is the problem occurring at a particular
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
A004 correct?
Does the monitor function D001
display the expected output frequency?
Verify the V/F settings match
motor specifications.
Make sure all scaling (such as
A011 to A014) is properly set.
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 B031
parameter (SFT mode).
Symptom/condition Probable Cause Solution