: Manually inspect the contactors for the spindle. Look for signs of burnt coils or mechanical jams that prevent them from pulling in.
: This is the most frequent culprit. If the 24VDC power supply (often manufactured by brands like Izumi) that powers the relay and contactor coils fails, the switching circuit cannot operate. fanuc 7115 alarm
: Access the FANUC Diagnostic Interface to find specific error bits. For spindle issues, diagnostic numbers like 409 or 408 often provide more granular detail on why the spindle module failed to start. Summary Table: Alarm 7115 Quick Fix Component to Check Expected Status Corrective Action DC Power Supply 24VDC Output Replace unit if output is 0V or fluctuating. Contactors Engaged when commanded Clean contacts or replace faulty contactors. Phase Balance Balanced 3-phase power Adjust phase converter legs if necessary. Parameters Match machine specs Verify winding switching parameters in the ladder. : Manually inspect the contactors for the spindle