When a fault occurs in the converter, the protective function activates to trip the converter, 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
Fault or alarm indication ............. When a fault or alarm occurs, the operation panel display automatically switches to a fault
Resetting method ....................... When a fault occurs, the converter operation is kept stopped. Unless it is reset, the
When any fault occurs, take an appropriate corrective action, then reset the converter, and resume the operation.
Not doing so may lead to the converter fault and damage.
Converter fault or alarm indications are roughly categorized as below.
(1) Error message
A message regarding operational fault and setting fault by the operation panel (FR-DU07-CNV) and parameter unit (FR-
PU07) is displayed. The converter continues its operation.
The converter continues its operation even when a warning is displayed. However, failure to take appropriate measures
will lead to a fault.
The converter continues its operation. You can also output an alarm signal by making parameter setting.
When a fault occurs, the converter trips and a fault signal is output.
Reset method of protective function
(1) Resetting the converter
The converter can be reset by performing any of the following operations. Note that the internal thermal cumulative value of
the electronic thermal relay function and the number of retries are cleared (erased) by resetting the converter.
Converter recovers about 1s after the reset.
Operation 1: ............. Using the operation panel, press
(This can be performed only when a fault
occurs. (Refer to page 128 for fault.))
Operation 2: ............. Switch power OFF once, then switch it ON
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 converter
is in a reset status.)
or alarm indication.
converter cannot restart. (Refer to page 124)