Fanuc — 7115 Alarm

Technical Report: FANUC Alarm 7115

1. Overview

| Attribute | Detail | | :--- | :--- | | Alarm Number | 7115 | | Alarm Message (Typical) | 7115 DISTANCE REF. POINT RETURN DIRECTION ERROR | | Appears On | FANUC Series 0i, 30i/31i/32i, 16i/18i/21i, Power Motion i, Robodrill, Robocut, Robonano | | Alarm Type | Servo / Axis Configuration Alarm | | Stop Type | Emergency Stop / Servo Disable (SV OFF) |

Inspect Contactors: Manually inspect the spindle winding switching contactors. Look for signs of burning, pitting, or mechanical sticking. fanuc 7115 alarm

Instead of frantically pressing the reset button, Marcus followed the protocol etched into his memory. He opened the heavy electrical cabinet at the back of the machine. He ignored the labyrinth of wires and went straight to the spindle amplifier module. His diagnostic checklist was clear and unforgiving: Technical Report: FANUC Alarm 7115 1

Test the relays associated with spindle winding selection. If the 7115 appeared after a recent repair (e.g., an ATC arm brake fix), double-check the wiring for any crossed signals. Ladder Diagnostics: FANUC Ladder3 Faulty limit switches, home sensors, or wiring to

• Faulty limit switches, home sensors, or wiring to these devices can cause the control to register faults that cascade into axis alarms.

: A hardware issue within the Spindle Amplifier itself that prevents it from sending the activation signal or processing the feedback signal. CNC Spares Troubleshooting & Solutions Check 24VDC Power

• Parameter 1006#5 for Z-axis = 0 (return in +Z direction).
• Physically, the deceleration dog was located above the switch at mid-stroke. When the Z-axis was at the tool change position (lowest point), the CNC wanted to move +Z to find the dog, but the dog was already below the switch.
• Solution: Parameter 1006#5 changed to 1 (return in –Z direction). After power cycle, reference return succeeded.