Code SP0092: Velocity command-dependent overspeed alarm
Issue Description & Safety Warning
The Fanuc Alpha-i Servo Spindle Amplifier has triggered a critical Velocity command-dependent overspeed alarm 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
Amplifier LED display: 92 Also shown as: SP0092 (15i), SP9092 (30i/31i/32i), SP9092 (0i-D) Cause: (1) Meaning In the main circuit, the DC voltage at the DC link is abnormally high. (2) Cause and troubleshooting (a) Excessive regenerated power The PSM does not have a sufficient capacity. → Check the specification of the PSM. (b) The output impedance of the AC power source is too high. → Check the power source output impedance. (Normal if the voltage variation at maximum output time is within 7%) (c) The main circuit power supply may have been switched off with an emergency stop state released. → Check the sequence.
Source: Fanuc αi Servo/Spindle Amplifier Maintenance Manual (B-65285EN/04) — Part II Troubleshooting
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc Alpha-i Servo Spindle Amplifier Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code SP0092 on the Alpha-i Servo Spindle Amplifier 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: 135 Fanuc Alpha-i Servo Spindle Amplifier codes.
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