Troubleshooting - Mitsubishi Electric FR-D720S-008SC Original Instruction

8 TROUBLESHOOTING

The frequency inverter FR-D700 SC has a multitude of protective functions which protect the drive and the inverter from damage
in case of a fault. When a 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 the 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 opened at
Fault or alarm display......................... When a fault or alarm occurs, the operation panel display automatically switches to the fault
Resetting method ............................... When a protective function of the inverter is activated, the power output of the inverter is
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.
Warning
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.
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.
the activation of the protective function, the inverter's control power will be lost and the alarm
output will not be held.
or alarm indication.
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.
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