Mitsubishi Electric FR-A800, Instruction Manual

Page: 918 / 1042

Causes and corrective actions Protective functions
6 - 30
Operation panel
indication
E.IOH FR-LU-08 Inrush overheat
Name Inrush current limit circuit fault (Standard models and IP55 compatible models only)
Description
The inverter trips when the resistor of the inrush current limit circuit is overheated. The inrush
current limit circuit failure
Check point
앫
Check that frequent power ON/OFF is not repeated.
앫
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.
앫
Check that the power supply circuit of inrush current limit circuit contactor is not damaged.
Corrective action
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.
Operation panel
indication
E.SER FR-LU-08 VFD Comm error
Name Communication fault (inverter)
Description
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 point Check the RS-485 terminal wiring.
Corrective action Perform wiring of the RS-485 terminals properly.
Operation panel
indication
E.AIE FR-LU-08 Analog input fault
Name Analog input fault
Description
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 point Check the Pr. 73, Pr. 267, and the voltage/current input switch settings.(Refer to page 5-389)
Corrective action
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.
Operation panel
indication
E.USB FR-LU-08 USB comm error
Name USB communication fault
Description
The inverter trips when the communication is cut off for the time set in Pr. 548 "USB
communication check time interval".
Check point
앫
Check that the USB communication cable is connected securely.
Corrective action
앫
Check the Pr. 548 setting.
앫
Connect the USB communication cable securely.
앫
Increase the Pr. 548 setting or set "9999." (Refer to page 5-648.)