Troubleshooting - Mitsubishi Electric FR-A760-00017-NA Installation Manuallines

TROUBLESHOOTING

6 TROUBLESHOOTING
When an alarm (major failures) 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 error (alarm) indications.
If your 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 inverter is
• Alarm display ...................................... When the protective function is activated, the operation panel display
• Resetting method ............................... When the protective function is activated, the inverter output is kept stopped.
• When the protective function is activated, take the corresponding corrective action, then reset the inverter, and
resume operation.
Not doing so may lead to the inverter fault and damage.
Inverter alarm displays are roughly divided as below.
(1) Error Message
A message regarding operational fault and setting fault by the operation panel (FR-DU07) and parameter unit (FR-
PU04 /FR-PU07) is displayed.
The inverter does not shut off output.
(2) 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.
(3) Minor fault
The inverter does not shut off output.You can also output a minor fault signal by making parameter setting.
(4) Major fault
When the protective function is activated, the inverter output is shut off and an alarm is output.
6.1 Reset method of protective function
(1) Resetting the inverter
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 1s after reset is cancelled.
Operation 1: ..... Using the operation panel, press
(Enabled only when the inverter protective function is activated (major
fault) ((Refer to the Instruction Manual (applied)) for major fault.))
Operation 2:...... Switch power off once, then switch it on again.
Operation 3: ..... Turn on the reset signal (RES) for more than 0.1s. (If the RES signal is
kept on, "Err." appears (flickers) to indicate that the inverter is in a reset
status.)
21
opened at the activation of the protective function, the inverter's control power
will be lost and the alarm output will not be held.
automatically switches to the above indication.
Unless reset, therefore, the inverter cannot restart. (Refer to page 21.)
to reset the inverter.
ON
OFF
Inverter
RES
SD