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93
Troubleshooting
Description of trouble Possible cause Solution
“OU” is displayed
during inverter
1. Is power voltage with the
specification
Improve power voltage condition
operation
2. Braking resistor not applied Apply braking resistor, increase braking
ratio
3. Deceleration time too short, unable Apply Code 09 and Code 11 to lengthen
“PLU” is displayed
during inverter
operation
to be loaded
1. Is power voltage with the
specification
2. Instantaneous power voltage
failure
3. Power dropped and the protector
function has operated
deceleration time
Improve power voltage condition
Check the capacity of the power facilities
Check the capacity of the power facilities
“OL” is displayed
1. Overload Reduce load or increase inverter capacity
during inverter
operation
“OH” is displayed
during inverter
2. Is inverter over current limiter
appropriate
1. Check if the cooling fan is still
working
Apply Code 06 to re-set motor rated current
Change cooling fan and clean dirt
operation
2. Is ambient temperature too hot Improve ambient temperature condition
No any indication,
1. Power failure Check the capacity of the power facilities
the output frequency
displayed “0”
2. Is there loosen part on external
control terminal
Check external control terminal
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