Protective Functions - Mitsubishi Electric FR-A700 Technical Manual

1.5 Protective functions

When a fault occurs, the inverter trips and the PU display
automatically changes to any of the following fault
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.
1) Retention of fault output signal
When the magnetic contactor (MC) provided on
the input side of the inverter is opened when a
fault occurs, the inverter's control power will be
lost and the fault output will not be held.
2) Fault or alarm indication
When a fault or alarm occurs, the operation panel
display automatically switches to the fault or alarm
indication.
3) Reset
When a fault occurrs, the inverter output is kept
stopped. Unless reset, therefore, the inverter
cannot restart.
When any failure occurrs, take the appropriate
corrective action, then reset the inverter, and
resume operation. Not doing so may lead to the
inverter failure and damage.
1.5.1 Reset method of fault
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.
Using the operation panel, press
Operation 1
(enabled only when the inverter
protective
activated)
common
(common)
to reset the inverter.
function (fault)
Inverter fault or alarm indications are roughly divided as
below.
1) Faults
When a fault occurrs, the inverter trips and a fault
signal is output.
2) Alarms
The inverter does not trip. You can also output an
alarm signal by making parameter setting.
3) Warning
The inverter does not trip even when a warning is
displayed. However, failure to take appropriate
measures will lead to a fault.
4) 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 trip.
Operation 2
Operation 3
is
96
SPECIFICATIONS
Switch power OFF once, then
switch it ON again.
ON
OFF
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.
Inverter
RES
SD