Fanuc 7115 Alarm May 2026

Understanding and Troubleshooting the FANUC 7115 Alarm

• Motor faults (winding damage, bearings failing, or excessive load) can make the servo unable to follow commands, producing large following errors and alarms.

. A single lost phase or a blown fuse in these modules is the most frequent cause for this specific alarm code. Inspect Switch Relays: fanuc 7115 alarm

(such as Izumi or internal modules) can prevent the switching logic or contactors from engaging correctly. Feedback/Sensor Issues: Understanding and Troubleshooting the FANUC 7115 Alarm

The Fanuc 7115 alarm, specifically displayed as "7115 SPN 1: SP SWITCH CONTROL ALARM," indicates a failure in the spindle speed switching sequence. It primarily occurs when the spindle speed switching contactors fail to pull in or engage correctly during power-on or operation. Meaning of the 7115 Alarm Motor faults (winding damage, bearings failing, or excessive

External Professional Support: For hardware-level failures, companies like Tri Star CNC Services or TRS Automation offer diagnosis and repair for Fanuc spindle drives and amplifiers. Related Alarms

• Fix: Verify that your machine tool builder actually purchased that specific option. If not, you must rewrite the code using basic G01/G02/G03 moves.

Alarm 750: A serial spindle link error often caused by improper cable connections or the spindle unit's power being off.

Step 4: Verify the I/O Link Hardware Loop

1. Open the electrical cabinet.
2. Locate the FANUC I/O unit (usually a module with LED status indicators).
3. Check the LED status: