Fanuc 414 Servo Alarm Z Axis Detect Error Repack Fix -

To pinpoint the exact internal failure, check the following diagnostic bits on the CNC screen: Diagnostic No. 200 : Check bits for specific errors: Bit #7 (OVL) : Overload condition. Bit #6 (LV) : Low voltage in the servo amplifier. Bit #5 (OVC) : Overcurrent detected by digital servo software. Bit #4 (HCA) : Abnormal current (High Current Alarm) in the amplifier. Bit #2 (DCA) : Regenerative discharge circuit alarm. Bit #1 (FBA) : Feedback cable disconnection. Diagnostic No. 204

1. Faulty sensors: The Z-axis detect error can be caused by faulty sensors, such as the position sensor or the velocity sensor.
2. Incorrect tuning: If the servo system is not properly tuned, it can lead to errors and alarms.
3. Mechanical issues: Mechanical problems, such as worn or damaged ball screws, bearings, or guide rails, can cause the servo alarm.
4. Power supply issues: Problems with the power supply, such as voltage fluctuations or electrical noise, can also trigger the alarm.
5. Software issues: In some cases, software errors or configuration issues can cause the servo alarm.

Prevention and Maintenance

• FANUC-recommended grease (e.g., Mobilux EP 1, or the machine builder’s spec – often a #1 or #0 consistency grease, not #2)
• Grease gun with flexible hose
• Clean rags
• Soft jaw vise grips or coupling tool
• Small screwdriver or pick
• Z-axis brake release tool (if needed)