Mitsubishi Electric FR-D720S SC EC Instruction Manual page 437

Troubleshooting
7 Troubleshooting
Frequency inverter FR-D700 SC EC has a multitude of protective functions which protect the dri-
ve and the inverter from damage in case of a fault. When an alarm occurs in the inverter, the pro-
tective function is activated bringing the inverter to an alarm stop and the PU display automat-
ically changes to any of the following error (alarm) indications. If the fault does not correspond
to any of the following errors or if you have any other problem, please contact your sales rep-
resentative.
● Retention of fault output signal . . . . . . . . . . . When the magnetic contactor (MC) provided
● Fault or alarm display . . . . . . . . . . . . . . . . . . When the protective function is activated, the
● Resetting method . . . . . . . . . . . . . . . . . . . . . When a protective function 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 over voltages
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.
NOTE Past eight faults can be displayed using the setting dial.
FR-D700 SC EC
on the input side of the inverter is opened at
the activation of the protective function, the
inverter's control power will be lost and the
alarm output will not be held.
operation panel display automatically switch-
es to the above indication.
activated, the power output of the inverter is
blocked (motor is coasting). The inverter can-
not start up again unless an automatic restart
has been configured or the inverter is reset.
Please observe carefully the warnings con-
tained below in the configuration of an auto-
matic restart or the execution of a reset.
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