Fanuc 7115 Alarm -

| | Common Causes | | --- | --- | | Magnetic Contactor Failure | Burned, pitted, or stuck contactor contacts; a seized contactor mechanism preventing it from switching to the correct speed range coil. | | Wiring & Loose Connections | Loose terminals, broken feedback wires from auxiliary contact blocks, or damaged vibration-prone cabling. | | Signal Feedback Issue | A missing feedback signal from an auxiliary contact that confirms contactor engagement, or a contactor switching but not sending the "done" signal back to the PMC. | | Mechanical Interference | Physical obstruction or binding in the gear-train or drawbar preventing smooth engagement into the desired range. | | Spindle Amplifier Failure | A hardware fault in the Spindle Amplifier Module (SPM), such as degraded internal components on the main control or power board. |

Several hardware and software discrepancies can trigger this fault during startup or mid-cycle operations. fanuc 7115 alarm