Mitsubishi Electric FR-A820-00046 Instruction Manual page 1072

Causes and corrective actions
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
6 - 32
E.IOH
Inrush current limit circuit fault (Standard models and IP55 compatible models only)
The inverter trips when the resistor of the inrush current limit circuit is overheated. The inrush
current limit circuit failure
Check that frequent power ON/OFF is not repeated.
Check if the input side fuse (5A) in the power supply circuit of the inrush current limit circuit
contactor (FR-A840-03250(110K) or higher) is blown.
Check that the power supply circuit of inrush current limit circuit contactor is not damaged.
Configure a circuit where frequent power ON/OFF is not repeated.
If the situation does not improve after taking the above measure, please contact your sales
representative.
E.SER
Communication fault (inverter) (not for FR-A800-E)
The inverter trips when communication error occurs consecutively for the permissible number of
retries or more when Pr. 335 "RS-485 communication retry count" ≠ "9999" during RS-485
communication from the RS-485 terminals. The inverter also trips if communication is broken for
the period of time set in Pr. 336 "RS-485 communication check time interval".
Check the RS-485 terminal wiring.
Perform wiring of the RS-485 terminals properly.
E.AIE
Analog input fault
The inverter trips when a 30 mA or higher current or a 7.5 V or higher voltage is input to terminal
2 while the current input is selected by Pr. 73 "Analog input selection", or to terminal 4 while the
current input is selected by Pr. 267 "Terminal 4 input selection".
Check the Pr. 73, Pr. 267, and the voltage/current input switch settings.(Refer to page 5-406)
Either give a current less than 30 mA, or set Pr. 73, Pr. 267, and the voltage/current input switch
to the voltage input and input a voltage.
E.USB
USB communication fault
The inverter trips when the communication is cut off for the time set in Pr. 548 "USB
communication check time interval".
Check that the USB communication cable is connected securely.
Check the Pr. 548 setting.
Connect the USB communication cable securely.
Increase the Pr. 548 setting or set "9999." (Refer to page 5-684.)
Protective functions
FR-LU-08 Inrush overheat
FR-LU-08 VFD Comm error
FR-LU-08 Analog input fault
FR-LU-08 USB comm error