Fanuc 414 Servo Alarm Z Axis Detect Error Repack

Verify the automated lube pump is cycling and oil pressure reaches the Z-axis splitters.

"Repack" is industry jargon for the systematic process of disconnecting, inspecting, cleaning, and reconnecting all electrical connections in the servo control and feedback loop. While the term does not appear in official FANUC documentation, it is widely used by field service technicians to describe a critical maintenance procedure.

| Cause | Description | |-------|-------------| | | Over time, grease in the Z-axis ballscrew dries out or migrates away from the nut. The nut runs dry, increases friction, and eventually jams or sticks. | | Brake failure | The Z-axis motor has a holding brake. If the brake doesn’t release fully, the motor cannot turn, causing a detect error at movement command. | | Encoder or cable fault | A broken or noisy feedback cable gives wrong position data. | | Servo drive or amplifier issue | The amplifier may not be supplying correct current to the motor. | | Mechanical binding | Chips, damaged rails, or worn guideways cause physical resistance. |

: Internal damage to the Servo Amplifier Module (e.g., a burned-out IGBT).

Resolving this requires pulling the axis apart to inspect and "repack" (rebuild) the structural mechanics. Ballscrew Inspection and Re-balling (Repacking)

: Check diagnostic parameters DGN 720 through 727 .