7
6.
TROUBLESHOOTING
Refer to this section when communication error occurs.
CPU LED does not work properly.
Symptom
Inverter doesn’t work properly or connection between options of VFD is
not achieved correctly.
Solution
1. Check power source of Inverter.
2. Check connection status whether option card is correctly inserted into
the slot of inverter or not, if inverter works normally.
TXD LED and RXD LED do not work properly.
What to check
Corrective action
Is the power provided to the converter?
Provide electric power to the converter.
Are the connections between converter and
computer correct?
Refer to converter manual.
Is communication card installed into the
inverter correctly?
Install it correctly referring to
“4.Installation”
Is communication program running on the
computer?
Start communication program.
Is baud rate of computer and inverter correctly
set?
Set baud rate identically referring to “4.
Installation”
Is the format of user program* right?
Correct user program.
Is the connection between converter and
communication card right?
Connect correctly referring to “4.
Installation”
* User program is User-made S/W for PC.
ERR LED is blinking.
Status
Solution
Blinking intermittently
Normal operation. Wrong data is received due to noise and
other causes.
Blinking after CPU LED
blinks
Network communication is not made for TimeOut (I/O 49).
Check Master status.
Blinking with CPU LED at the
same time
Communication error between inverter and option card.
Cycle the inverter power (On/Off). If this problem persists,
contact LG representatives.
* Refer to COM group parameters for Freq/Run/Stop command setting.
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