Code ARC-143: Power supply/feeder com alarm(E:%d)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Power supply/feeder com alarm(E:%d) alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Cause: In the power supply, the communication between the operation board and the control board was disconnected. Remedy: 1. Check the fuses [For feeder: 3A(FU2)/8A(FU3)]. If the fuses were blown, please perform the following remedy. Change the encoder cable and fuses Change the encoder board in the wire feeder, and change fuses. 2. Change the Gabana board. 3. Change operation board in the welding power supply.
Source: FANUC Robot R-30iA Alarm Code List Operator's Manual
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc R-30i Series Robot Controller Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code ARC-143 on the R-30i Series Robot Controller identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 6553 Fanuc R-30i Series Robot Controller codes.
Have a better solution?
Help the industrial community by sharing your repair experience for code ARC-143.
Need a searchable reference for more Fanuc R-30i Series Robot Controller manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026