Code SP0002: Excessive speed deviation
Issue Description & Safety Warning
The Fanuc Alpha-i Servo Spindle Amplifier has triggered a critical Excessive speed deviation 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: 02 Also shown as: SP0002 (15i), SP9002 (30i/31i/32i), SP9002 (0i-D) Action: FS15i FS16i FS0i-B/C FS30i FS0i-D Description 3082 4082 4082 Setting of acceleration/deceleration time (b) The parameter for the speed detector is not set correctly. Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN)," set a correct value. (2) If this alarm is issued at a heavy cutting load (a) The cutting load has exceeded the motor output power. Check the load meter indication, and review the use condition. (b) The parameters for output restriction are not set correctly. Check that the settings of the following parameters satisfy the machine and motor specifications: FS15i FS16i FS0i-B/C FS30i FS0i-D Description 3028 4028 4028 Output restriction pattern setting 3029 4029 4029 Output restriction value (c) The parameters specific to the motor are not correctly. Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN)," check the motor-specific parameters.
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 SP0002 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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