Troubleshooting - Mitsubishi Electric FR-A741-5.5K Installation Manualline

7 TROUBLESHOOTING

When an fault occurs in the inverter, the protective function is activated bringing the inverter to an alarm stop and the PU
display automatically changes to any of the following fault (alarm) indications.
If your fault does not correspond to any of the following faults or if you have any other problem, please contact your sales
representative.
• Retention of fault output signal ........... When the magnetic contactor (MC) provided on the input side of the inverter is
• Fault or alarm display.......................... When a fault or alarm occurs, the operation panel display automatically switches to
• Resetting method ...............................When a protective function of the inverter is activated, the power output of the
• If protective functions were activated (i. e. the inverter switched off with an error message) follow the instructions for error
correction provided in the manual for the inverter. Especially in the case of short circuits or earth contacts in the inverter
output and mains overvoltages the cause of the fault must be determined prior to switching on again as a recurrence of such
faults at short intervals can lead to premature aging of components or even the complete breakdown of the device. After the
cause of the fault has been found and corrected the inverter can be reset and operations continue.
Inverter fault or alarm indications are roughly divided as below.
• Error Message
A message regarding operational fault and setting fault by the operation panel and parameter unit (FR-PU04/FR-PU07) is
displayed. The inverter does not shut off output.
• Warnings
The inverter does not shut off output even when a warning is displayed. However, failure to take appropriate measures will
lead to a major fault.
• Alarm
The inverter does not shut off output.You can also output an alarm signal by making parameter setting.
• Fault
When the protective function is activated, the inverter output is shut off and an fault signal is output.
7.1 Reset method of protective function
The inverter 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 inverter. Recover
about 1 s after reset is cancelled.
Three different methods can be used to reset an inverter.
• Using the operation panel, press the STOP/RESET key to reset the inverter.
(This may only be performed when a fault occurs.)
• Switch power off once, then switch it on again.
• 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 inverter is in a reset status.)
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opened at the activation of the protective function, the inverter's control power will be
lost and the alarm output will not be held.
the fault or alarm indication.
inverter is blocked (motor is coasting). The inverter cannot start up again unless
an automatic restart has been configured or the inverter is reset. Please observe
carefully the warnings contained below in the configuration of an automatic restart
or the execution of a reset.
ON
OFF
Inverter
RESET
RES
PC