Code SPOT-490: IWC(DG) timer now in weld %d
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical IWC(DG) timer now in weld %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: An invalid weld controller number was specified. Remedy: The current number of weld controllers that the system is configured for is displayed in the error message. Only use the value one up to and including the number posted on the error line. If you need to increase the number of weld controllers, then perform a controlled start, and define the new number of weld controllers when prompted during the SETUP APPLICATION menu.
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 SPOT-490 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.
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