Loose or damaged cables between the spindle amplifier and the motor can prevent the switching signal from completing.
Press the hard key, then navigate to the MACRO softkey. Check variables #100–#199 and #500–#999.
The system timed out while waiting for a confirmation signal (proximity switch or auxiliary contact) that the spindle has successfully switched states. Recommended Steps Check 24V DC Supplies:
Inspect the cables for damage, as a short circuit can trigger this alarm. 4. Check Spindle Drive (SPM) Parameters/Status
The gear changing mechanism is stuck or physically jammed.
Troubleshooting the FANUC 7115 Alarm: SPN 1 Spindle Switch Control Error
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The CNC program or PLC ladder has triggered a switch command too fast, or while the spindle was still rotating.
Restore from a known working backup if the error persists across all programs.
In technical terms, the 7115 alarm corresponds directly to on the Fanuc spindle amplifier module. On a Fanuc Alpha i spindle drive, you will see a red "ALM" LED illuminated, and the two-digit 7-segment LED display on the front of the unit will show " 15 ".