Code SRVO-071: SPHAL alarm (Grp:%d Ax:%d)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical SPHAL alarm (Grp:%d Ax:%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: The excessively large feedback speed was detected. Remedy: 1. This alarm does not indicate the main cause of the problem if issued together with the PHAL alarm (SRVO-064). 2. It might be mis-detection by the noise. Check whether the ground/shield is connected correctly. If possible, enhance the ground/shield. 3. Replace the pulse coder of the motor. Mastering is required. 4. Replace the servo amplifier 5. Replace the robot connection cable 6. Replace the cable in the mechanical unit
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 SRVO-071 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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