Hitachi SJ300-037HFE Benutzerhandbuch

Troubleshooting

T

roub

leshooting

and Maintenance

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).