6–4

Troubleshooting

Troubleshooting Maintenanceand

 

Symptom/condition

Probable Cause

Solution

 

 

 

 

 

 

 

 

 

 

speed).

• If using the analog input, is the

(reduces output as needed).

 

 

 

 

• Check the wiring.

 

 

 

 

current or voltage at [O] or [OI]?

• Check the potentiometer or

 

 

 

 

 

signal generating device.

 

 

 

 

• Is the load too heavy?

• Reduce the load.

 

 

The motor speed will not reach

 

• Heavy loads activate the

 

 

the target frequency (desired

 

overload restriction feature

 

 

 

 

 

 

 

 

 

 

• Is the inverter internally limiting

• Check max frequency

 

 

 

 

 

 

 

 

the output frequency?

setting (A004)

 

 

 

 

 

• Check frequency upper limit

 

 

 

 

 

setting (A061)

 

 

 

 

 

 

 

 

 

 

• Is the load fluctuation too great?

• Increase the motor capacity

 

 

 

 

 

(both inverter and motor).

 

 

The rotation is unstable.

• Is the supply voltage unstable?

• Fix power supply problem.

 

 

• Is the problem occurring at a partic-

• Change the output frequency

 

 

 

 

ular frequency?

slightly, or use the jump

 

 

 

 

 

frequency setting to skip the

 

 

 

 

 

problem frequency.

 

 

 

 

 

 

 

The RPM of the motor does not

• Is the maximum frequency setting

• Verify the V/f settings match

 

 

match the inverter output

A004 correct?

motor specifications.

 

 

frequency setting.

• Does the monitor function D001

• Make sure all scaling (such

 

 

 

 

 

 

 

 

display the expected output

as A011 to A014) is

 

 

 

 

frequency?

properly set.

 

 

 

 

 

 

 

 

 

 

• Was power turned OFF after a

• Edit the data and press the

 

 

 

 

parameter edit but before pressing

Store key once.

 

 

 

No downloads

the Store key?

 

 

 

 

 

 

 

 

 

• Edits to data are permanently

• Wait six seconds or more

 

 

Inverter data

have occurred.

 

 

 

stored at power down. Was the time

before turning power OFF

 

 

is not

 

from power OFF to power ON less

after editing data.

 

 

correct.

 

than six seconds?

 

 

 

 

 

 

 

 

 

 

A download to

• Was the power turned OFF within

• Copy the data to the inverter

 

 

 

the inverter was

six seconds after the display

again, and keep power ON

 

 

 

attempted.

changed from REMT to INV?

for six seconds or more after

 

 

 

 

 

copying.

 

 

 

 

 

 

 

 

A parameter

True for certain

• Is the inverter in Run Mode? Some

• Put inverter in Stop Mode

 

 

will not

parameters

parameters cannot be edited during

(press the Stop/reset key).

 

 

 

Run Mode.

Then edit the parameter.

 

 

change after

 

 

 

 

 

 

 

 

an edit

True for all

• If you’re using the [SFT] intelligent

• Change the state of the SFT

 

 

(reverts to

parameters

input (software lock function)—is

input, and check the B031

 

 

old setting).

 

 

 

the [SFT] input ON?

parameter (SFT mode).