: Problems with the Z-axis encoder (pulse coder) or the feedback cable back to the CNC Diagnostic Indicators
A floating ground between the CNC and the transformer creates a voltage potential. The 5V encoder signal sees 2V of AC noise superimposed. This corrupts the feedback, triggering a detect error. fanuc 414 servo alarm z axis detect error
The 414 alarm can stem from both electrical and mechanical sources: Fanuc 414 Servo Alarm Z Axis CNC Vertical machine : Problems with the Z-axis encoder (pulse coder)