Fanuc 414 Servo Alarm Z Axis Detect Error ((full)) (2027)

Lead Pulse Error. Indicates a feedback problem, often related to the encoder.

What is showing on the physical servo amplifier LED display?

Swap the Z-axis command cable and feedback cable with the X or Y-axis at the servo amplifier module side.

Follow this step-by-step checklist to isolate and fix the Z-axis detection error. 1. Check for Mechanical Binding and the Axis Brake fanuc 414 servo alarm z axis detect error

Clean any contamination using an electrical contact cleaner and dry it thoroughly with compressed air. 3. Conduct a Cable Continuity and Short Test

What is the of your control (e.g., 0i-Mate, 16i, 21i)?

Overcurrent. An abnormal current spike occurred in the servo motor or amplifier circuit. Lead Pulse Error

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)

Use a Megohmmeter to check the insulation resistance of the Z-axis motor windings. If it reads near zero, the motor has a short to ground and must be rewound or replaced. 3. Contaminated Power Cables Coolant and oil are the enemies of CNC electronics.

On FANUC 16, 18, 21, and 0i series controls, the 414 alarm is a . The CNC software monitors current, position, and velocity feedback. If the digital servo software detects an anomaly that prevents accurate axis control, it triggers this alarm. Swap the Z-axis command cable and feedback cable

To help narrow down the exact issue, I can provide the specific or walk you through resetting the Z-axis home position if you need to replace a parts component.

Perform a megaphone or resistance check on the output terminals (U, V, W) to ground. If the readings are unbalanced, replace the amplifier. Prevention and Maintenance Tips

Keep electrical cabinet filters clean. Overheating reduces the lifespan of the current detection components inside Fanuc drives. To help narrow down the diagnosis, let me know:

Unplug the machine or lock out the main breaker. Try to turn the Z-axis ballscrew by hand (using a wrench on the motor coupling).

Understanding the root causes of this error allows maintenance teams to minimize costly machine downtime and restore production quickly. Understanding the FANUC 414 Alarm Code