Fanuc 7115 Alarm

Fanuc 7115 alarm

The , specifically the "SPN 1: SP SWITCH CONTROL ALARM," typically signals a failure in the spindle switching control circuit. This is most often caused by hardware issues in the 24VDC power system or physical contactors responsible for switching spindle speed gears (Hi/Lo). Primary Causes & Diagnostic Steps

Case Study B: The Missing Terminator Resistor

Root Causes

• If all LEDs off → No control power.
• If red LED (status) on → Amplifier internal fault likely.

Understanding and Troubleshooting the FANUC 7115 Alarm