Fanuc 414 Servo Alarm Z Axis Detect Error [FREE →]

“414 Z-axis detect error” is (ballscrew/bearing). It’s almost always electrical: broken encoder cable, failed drive, or less often a bad motor encoder. Don’t pull the ballscrew – check the wires first.

| Domain | Common Culprits | Severity | | :--- | :--- | :--- | | | Blown Z-axis drive fuse, low input voltage, bad servo amplifier, dying motor windings | High (Component failure) | | Feedback System | Dirty/ oily encoder, broken scale reader head, cut feedback cable, connector corrosion | Medium (Wiring/cleaning) | | Mechanical Binding | Seized ball nut, broken ballscrew wiper, gibs too tight, spindle head ways dry | Low (Adjustment/repair) | | Control/Parameters | Wrong servo parameter (2084/2085), incorrect motor ID, corrupted firmware | Low (Software fix) | fanuc 414 servo alarm z axis detect error

Inspect the power cable leading to the Z-axis motor. Coolant often seeps into the "Cannon" connectors, causing a short circuit between phases. Clean the connectors with electrical contact cleaner and dry them thoroughly. 4. Feedback (Encoder) Issues “414 Z-axis detect error” is (ballscrew/bearing)

What is showing on the LED display of the servo drive itself? | Domain | Common Culprits | Severity |

When this alarm occurs, the CNC screen displays "414 SERVO ALARM: Z AXIS DETECT ERROR". However, the machine's electrical cabinet provides the specific hardware status:

To resolve the FANUC 414 servo alarm related to the Z-axis detect error, follow these steps: