| Attribute | Detail | | :--- | :--- | | | 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) |
| Step | Action | | :--- | :--- | | | Power off and on the CNC. Sometimes the alarm occurs due to a transient state. | | 2 | Manually jog the axis to the middle of its travel range, away from the decel dog. Then attempt reference return again. | | 3 | Check the deceleration dog (limit switch or proximity sensor). Ensure it is not stuck in the active (depressed) state when the axis is away from it. | | 4 | Monitor the decel dog signal on the PMC diagnostic screen: Typically X address (e.g., X9.0 for Z-axis). The signal should be 1 when the dog is not activated, and 0 when the axis is on the dog. If reversed, invert the signal logic in PMC or check wiring. | | 5 | Check Parameter 3004#5 (RCD) – Set to 1 to disable the direction check (temporary workaround only for testing). If alarm disappears, the root cause is a configuration or hardware direction issue. | | 6 | Check Parameter 1006#5 for the axis. If 0: reference return in + direction. If 1: reference return in – direction. Confirm this matches the physical decel dog placement and machine design. | fanuc 7115 alarm
Alarm 7115 is a critical safety alarm indicating that the system has detected a condition where the spindle or servo motor speed has exceeded the maximum allowable limit defined in the control parameters. Alternatively, it may indicate that the control has calculated an invalid speed based on current parameter settings. | Attribute | Detail | | :--- |
To minimize the occurrence of the FANUC 7115 alarm and ensure optimal CNC machine performance, follow these prevention and maintenance tips: | | 2 | Manually jog the axis
The alarm triggers when the spindle control unit does not receive the expected signals during a switching command.
Loose or damaged cables between the spindle amplifier and the motor can prevent the switching signal from completing.