The FANUC 7115 alarm (often displayed as SPN 1: 7115 SP SWITCH CONTROL ALARM) is a spindle-related error that occurs when the system fails to switch between high and low-speed winding configurations correctly. This typically happens when the switching contactors fail to engage during power-on or when a speed change is commanded. Common Causes
It is not a simple "Overtravel" or "Servo Error." It is a Static Impulse Clamping Alarm. 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
Alarm Code: 7115 Alarm Message: OVERSPeed (or related parameter error) Applicable Systems: Fanuc Series 16i/18i/21i, 16/18/21, 0i, and 30i Series controls. The FANUC 7115 alarm (often displayed as SPN