The Z-axis often carries the weight of the spindle head, making it susceptible to binding.

Clean both male and female connectors thoroughly using an electrical contact cleaner. Dry completely with compressed air.

By following these troubleshooting steps and performing regular maintenance, you can minimize the occurrence of the Fanuc 414 servo alarm Z-axis detect error and ensure optimal performance of your CNC machine.

Verify the automatic greasing or oiling system pumps properly to the Z-axis ways. To help isolate your specific Z-axis issue, tell me:

Because the Z-axis is vertical, it features a built-in mechanical brake. If the 24VDC power supply to the brake drops, or if the brake friction pads seize, the servo motor will attempt to turn against a locked axis. This mechanical restriction draws massive current, triggering the digital loop alarm. Step-by-Step Diagnostic and Resolution Protocol

Switch the feedback cables of the Z-axis and X-axis at the servo amplifier drive unit.