5.2 Troubleshooting
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If any function of the inverter is lost due to occurrence of a fault, clear up the cause and make correction in
accordance with the following procedure. Contact your sales representative if the corresponding fault is not found
below, the inverter has failed, parts have been damaged, or any other fault has occurred.
5.2.1 Checking the operation panel display at alarm stop
The alarm code is displayed on the operation panel to indicate the cause of a faulty operation. Clear up the cause
and take proper action in accordance with the following table:
Check for output short circuit or ground fault.
Increase acceleration time.
Check for output short circuit or ground fault.
Check for output short circuit or ground fault.
Mechanical brake of motor operating too fast?
Increase deceleration time.
Increase acceleration time.
Increase deceleration time. (Set deceleration time
2
Motor used under overload?
Increase motor and inverter capacities.
Check the cause of instantaneous power failure.
Large-capacity motor started?
Jumper or DC reactor connected across terminals P-
Check power system equipment such as power
Connect jumper or DC reactor across terminals P-P1.
Ambient temperature too high?
Set ambient temperature within specifications.
Check motor and cables for ground fault.
Check motor for overheat.
Reduce load and frequency of operation.
Motor used under overload?
Increase motor and inverter capacities.
Check for loose connectors.
Option function setting or operation proper?
(1 to 3 indicate the option slot numbers.)
Check the option function setting, etc.
Number of parameter write times too many?
DU or PU fitted securely?
Check for open output phase.
Check for loose connectors.
Check PC terminal output for short.
Check PU connector cable for short.
STOP key of operation panel pressed during external
Brake resistor used too often?
Increase deceleration time.
Load too large? Sudden acceleration?
Reduce load amount or frequency of running.
Motor used under overload?
Reduce frequency of braking.
Is the DC circuit short circuited?
Repair the short-circuited section, and replace the DC
