Reset Method Of Protective Function - Mitsubishi Electric FR-D720-0.2K-G Instruction Manual

Reset method of protective function

When a fault occurs in the drive unit, the drive unit output is shut off and the PU display automatically changes to one of the
following fault or 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 drive unit is opened
 Fault or alarm indication ..........When a fault or alarm occurs, the operation panel display automatically switches to the fault
 Resetting method ....................When a fault occurs, the drive unit output is kept stopped. Unless reset, therefore, the drive
 When any fault occurs, take the appropriate corrective action, then reset the drive unit, and resume operation.
Not doing so may lead to the drive unit fault and damage.
Drive unit fault or alarm indications are roughly categorized as below.
(1) Error message
A message regarding operational fault and setting fault by the operation panel and parameter unit (FR-PU07) is
displayed. The drive unit does not trip.
(2) Warning
The drive unit output is not shut off even when a warning is displayed. However, failure to take appropriate measures will
lead to a fault.
(3) Alarm
The drive unit output is not shut off. You can also output an alarm signal by making parameter setting.
(4) Fault
When a fault occurs, the drive unit output is shut off and a fault signal is output.
REMARKS
 Past eight faults can be displayed using the setting dial. (Refer to page 51 for the operation.)
5.1

Reset method of protective function

The drive unit can be reset by performing any of the following operations. Note that the internal accumulated heat value of the
electronic thermal relay function and the number of retries are cleared (erased) by resetting the drive unit.
Drive unit recovers about 1s after the reset is released.
Operation 1: ...... Using the operation panel, press
(This may only be performed when a fault occurs (refer to page 257 for
fault).)
Operation 2: ....... Switch power OFF once. After the indicator of the operation panel
turns OFF, switch it ON again.
Operation 3: . ..... Turn ON the reset (RES) signal for more than 0.1s. (If the RES signal
is kept ON, "Err." appears (blinks) to indicate that the drive unit is in a
reset status.)
NOTE
 OFF status of the start signal must be confirmed before resetting the drive unit fault. Resetting drive unit fault with
the start signal ON restarts the motor suddenly.
252
when a fault occurs, the drive unit's control power will be lost and the fault output will not be
held.
or alarm indication.
unit cannot restart. (Refer to page 252.)
to reset the drive unit.
ON
OFF
Drive unit
RES
SD