Troubleshooting - LG RS 485 User Manual

6.

TROUBLESHOOTING

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