Fanuc 7115 Alarm [top] Jun 2026

. Ensure they are physically moving and that the auxiliary contacts are sending the correct feedback to the CNC. Monitor Spindle Status: Check the status of the

: Failing 24VDC power supplies (such as Izumi units) are a frequent root cause. If the voltage is unstable or dropping, the contactors may not have enough power to pull in. Faulty Contactors

When this alarm appears, the often displays a corresponding alarm, such as ALM 15 (Spindle speed switching error). Key Causes of the 7115 Alarm

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The physical overtravel switch or its cable is damaged, sending a false "limit tripped" signal to the controller.

Any reading below 10 Megohms indicates insulation breakdown or fluid contamination inside the motor or junction box.

Slowly jog the affected axis in the of the limit. If the voltage is unstable or dropping, the

Instead, slow down, look at the specific line number, and check for typos or unsupported features. 9 times out of 10, you’ll find an extra period, a stray letter, or a missing decimal.

Coolant, oil, or metal shavings have penetrated the power cable connectors, causing phase-to-phase shorts.

Once you have identified the culprit from the diagnostics above, apply the corresponding fix: The physical overtravel switch or its cable is

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If your systematic testing does not yield a clear answer, it's time to seek help. The Fanuc community is vast and experienced.

Often appears alongside 7115, indicating an inverter-related overcurrent or IPM (Intelligent Power Module) fault.