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5 TROUBLESHOOTING
When a fault occurs in the converter unit, the protective function activates, and the PU display automatically changes to
one of the fault or alarm indications listed on page 25.
If the fault does not correspond to any of the following errors or if you have any other problem, please contact your sales
representative.
Retention of alarm output signal....... When the magnetic contactor (MC) provided on the input side of the converter unit
Alarm display .................................... When the protective function is activated, the operation panel display
Resetting method ............................. When a protective function is activated, the inverter output is kept stopped. Unless
When the protective functions were activated, take an appropriate corrective action, then reset the converter unit
(inverter), and resume the operation. Not doing so may lead to a converter unit (an inverter) fault and damage.
Converter unit fault or alarm indications are roughly divided as below:
Error Message
A message regarding operational fault and setting fault by the operation panel (FR-DU08) is displayed. The inverter
does not shut off output.
Warning
The inverter does not shut off output even when a warning is displayed. However, failure to take appropriate measures
will lead to a fault.
Alarm
The inverter does not shut off output.You can also output an alarm signal (LF) by making parameter setting.
Fault
When the protective function is activated, the inverter output is shut off and a fault signal (ALM) is output.
NOTES
For the details of fault displays and other malfunctions, also refer to the Instruction Manual.
Past eight faults can be displayed using the setting dial. (Refer to page 21.)
5.1 Reset Method of Protective Function
The converter unit can be reset by performing any of the following operations. Note that the internal thermal integrated
value of the electronic thermal relay function and the number of retries are cleared (erased) by resetting the converter unit.
Converter unit recovers about 1s after reset is cancelled.
Three different methods can be used to reset a converter unit:
Using the operation panel, press the STOP/RESET key to reset the converter unit .
(This may only be performed when a fault occurs.)
Switch OFF the power once, then switch it ON again after the indicator of the operation
panel turns OFF.
Turn ON the reset signal (RES) for more than 0.1 s. (If the RES signal is kept ON,
"Err." appears (flickers) to indicate that the converter unit is in a reset status.)
CAUTION
OFF status of the inverter start signal must be confirmed before resetting the converter unit fault. Resetting converter unit
fault with the inverter start signal ON restarts the inverter suddenly. This may cause injury.
24
is opened at the activation of the protective function, the converter unit's control
power will be shut off and the alarm output will not be held.
automatically switches to the fault or alarm indication.
reset, the converter unit (inverter) cannot restart. (Refer to page 24.)
ON
OFF
Converter unit
RES
PC
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