Troubleshooting - Mitsubishi Electric 800 Series Installation Manualline

6 TROUBLESHOOTING

6.1 Inverter fault and alarm indications
l 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.
l 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.
l When a protective function activates, note the following points.
Item
Fault output signal
Fault or alarm indication
Operation restart method
l Inverter fault or alarm indications are categorized as below.
Item
Error message
Warning
Alarm
Fault
NOTES
l For the details of fault displays and other malfunctions, also refer to the FR-F800 Instruction Manual (Detailed).
l Past eight faults can be displayed using the setting dial. (Refer to page 19.)
6.2 Reset method of protective function
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.
Inverter recovers about 1s after reset is released.
Three different methods can be used to reset an inverter.
l Using the operation panel, press the STOP/RESET key to reset the inverter.
(This may only be performed when a fault occurs.)
l Switch OFF the power once, then switch it ON again.
l Turn ON the reset signal (RES) for more than 0.1s. (If the RES signal is kept ON,
"Err" appears (blinks) to indicate that the inverter is in a reset status.)
CAUTION
OFF status of the start signal must be confirmed before resetting the inverter fault. Resetting inverter fault with the start signal
ON restarts the motor suddenly. This may cause injury.
33
Description
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.
Description
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.
ON
OFF
Inverter
RES
PC