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Inverter Fault And Alarm Indications; Reset Method For The Protective Functions - Mitsubishi Electric FR-A800 Instruction Manual

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Inverter fault and alarm indications

Inverter fault and alarm indications
• When the inverter detects a fault, depending on the nature of the fault, the operation panel displays an error message or
warning, or a protective function activates to trip the inverter.
• When any fault occurs, take an appropriate corrective action, then reset the inverter, and resume the operation.
Restarting the operation without a reset may break or damage the inverter.
• When a protective function activates, note the following points.
Fault output signal
Fault or alarm indication
Operation restart method
• Inverter fault or alarm indications are categorized as below.
Displayed item
Error message
• For the details of fault displays and other malfunctions, also refer to the FR-A800 Instruction Manual (Detailed).
• The past eight faults can be displayed using the setting dial. (Refer to

Reset method for the protective functions

Reset the inverter by performing any of the following operations. Note that the accumulated heat value of the electronic
thermal relay function and the number of retries are cleared (erased) by resetting the inverter.
The inverter recovers about 1 s after the reset is released.
• On the operation panel, press
(This may only be performed when a fault occurs.)
• Switch the power OFF once, then switch it ON again.
• Turn ON the reset signal (RES) for 0.1 s 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 the inverter fault. Resetting an inverter fault with the start
signal ON restarts the motor suddenly.
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.
When a protective function activates, the operation panel displays a fault indication.
While a protective function is activated, the inverter output is kept shutoff. Reset the inverter to restart
the operation.
A message regarding an operational fault and setting fault by the operation panel and the parameter
unit. The inverter does not trip.
The inverter does not trip even when a warning. However, failure to take appropriate measures will
lead to a fault.
The inverter does not trip. An Alarm (LF) signal can be output with a parameter setting.
A protective function activates to trip the inverter and output a Fault (ALM) signal.
to reset the inverter.


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