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When a fault occurs in the inverter, the protective function activates, and the PU display automatically changes to one of the fault or alarm
indications on
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 the fault output signal
Opening the magnetic contactor (MC) provided on the input side of the inverter at a fault occurrence shuts off the control power to the
inverter, therefore, the fault output will not be retained.
• Fault or alarm indication
When a fault or alarm occurs, the operation panel display automatically switches to a fault or alarm indication.
• Resetting method
When a fault occurs, the inverter output is kept stopped. Unless reset, the inverter cannot restart. (Refer to
• When any fault occurs, take an appropriate corrective action, then reset the inverter, and resume the operation. Not doing so may lead to
an inverter fault and damage.
Inverter fault or alarm indications are roughly categorized as below.
• Error message
A message regarding operational fault and setting fault by the operation panel (FR-DU08) and parameter unit (FR-PU07) is displayed. The
inverter does not trip.
• Warning
The inverter does not trip even when a warning is displayed. However, failure to take appropriate measures will lead to a fault.
• Alarm
The inverter does not trip. An alarm can also be output with a parameter setting.
• Fault
When a protective function activates, the inverter trips and a fault signal is output.
• For the details of fault displays and other troubles, also refer to
• The past eight faults can be displayed using the setting dial. (Refer to
Reset method for the protective functions
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. The inverter recovers about 1s after the reset is
• Using the operation panel, press
(This may only be performed when a fault occurs.)
• Switch power OFF once, then switch it ON again.
• Turn ON the reset signal (RES) for 0.1s or more. (If the RES signal is kept ON, "Err" appears (flickers) to indicate that
the inverter is in a reset status.)
• OFF status of the start signal must be confirmed before resetting an inverter fault. Resetting an inverter fault with the start
signal ON restarts the motor suddenly.
to reset the inverter.
Reset method for the protective functions
the Instruction Manual (Detailed).


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