The is a Spindle Switching Control Alarm (SPN1 7115). It typically occurs on machines equipped with a spindle switching function—such as those with high/low gear winding—when the system detects an inconsistency or failure during the switching process. Common Causes
The control is not receiving the expected confirmation signal from the spindle unit or switching sensor. Troubleshooting Steps Check 24VDC Power: fanuc 7115 alarm
It is not a simple "Overtravel" or "Servo Error." It is a . Essentially, the controller detected an external force or resistance while the axis was supposed to be stationary (clamped), or it detected resistance that prevented it from achieving a "clamp" state. Fanuc 7115 Alarm The is a Spindle Switching