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Chapter 10 Troubleshooting
10 - 2
3. Motor does not accelerate to command speed.
Possible Cause(s)
Corrective Action
Bad connection of analog wiring.
Check the wiring.
In case of analog voltage or variable resistor
input, check voltage between [O/OI] and [L]
terminal.
In case of analog current, check current between
current source and [O/OI] terminal. Check SW6.
Once again, set the SW6 ON-OFF
Overload restriction or OC suppression function works.
Check the function level.
Max. frequency (A004) or upper limit (A061/A261) is lower
than as expected.
Check the value.
Acceleration time is excessive.
Change acceleration time (F002/A092/A292).
“Multi-speed input(s) (02 to 04:CF1 to CF3)” is (are) set to
input terminal(s) and active.
Deactivate the input(s).
"06:JG " is set to input terminal and the input is active.
Deactivate the input.
Excessive load.
Remove excessive load.
Motor is locked.
Unlock the motor.
4. Inverter does not respond to changes in frequency setting F001 display from operator.
Possible Cause(s)
Corrective Action
Incorrect frequency source is selected.
Check frequency source (A001=02).
"51:F-TM" is set to input terminal and the
input is active.
Deactivate the input.
5. A part of function codes is not displayed.
Possible Cause(s)
Corrective Action
"Function code display restriction" (b037) is
enabled.
Set 00 (all display) to b037.
"86:DISP" is set to input terminal and the
input is active.
Deactivate the input.
6. Operator (keypad) does not respond.
Possible Cause(s)
Corrective Action
"86:DISP" is set to input terminal and the
input is active.
Deactivate the input.
7. Parameter data does not change.
Possible Cause(s)
Corrective Action
Inverter is in RUN status.
Stop the inverter, make sure the motor stops and try again.
If "RUN mode edit" is enabled, a part of function codes can be
changed in RUN status.
Software lock function (b031) is enabled.
Disable software lock function.
8. Motor rotates reverse direction with forward command.
Possible Cause(s)
Corrective Action
Incorrect power wiring.
Exchange any two of U/T1, V/T2 or W/T3.
Incorrect logic of direction signal in 3-wire
operation.
Check the logic of input set as "22:F/R".
9. Motor rotates reverse direction with RUN key of keypad.
Possible Cause(s)
Corrective Action
Keypad RUN key routing (F004) is
incorrectly set.
Check F004.
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