This is a technical deep-dive into the FANUC 414 Servo Alarm: Z-Axis Detect Error (often displayed as SV0414 or 414 on the CNC control).
Fanuc 414 Servo Alarm on the Z-axis indicates a digital servo system fault where the CNC has detected an abnormality in the servo drive or its feedback circuit. Because the Z-axis is vertical, it is often subject to higher mechanical stress and specific failure modes like brake malfunctions or counterweight imbalances. TIE Industrial Fanucworld Initial Diagnostic Steps To pinpoint the exact cause, refer to the CNC Diagnostic Screen Servo Amplifier LED CNC Diagnostics Diagnostic No. 200 HCA (Bit 4) fanuc 414 servo alarm z axis detect error
What is the FANUC 414 Servo Alarm?
The "detect error" is a symptom. The cause lies in one of four domains: Electrical Power, Feedback, Mechanical, or Control. This is a technical deep-dive into the FANUC
Jim pulled out a megohmmeter (insulation tester). Using a standard multimeter wouldn't work because it can't detect the high-voltage "leaks" that cause a 414 alarm. He tested the Z-axis power cable. The needle dropped to zero. A short to ground. The cause lies in one of four domains: