Code SRVO-123: Fan motor rev slow down(i)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Fan motor rev slow down(i) 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
(Explanation) The rotation speed of fan motor is slow down. (Action 1) Check the fan motor and its cables. Replace them if necessary. (Action 2) Replace the backplane unit. Before executing the (Action 3), perform a complete controller back up to save all your programs and settings. (Action 3) Replace the main board. Fan motor Main board
Source: FANUC Robot R-30iB Mate Maintenance Manual (B-83525EN/07)
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 SRVO-123 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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