| Cause | Likelihood | Repack needed? | |--------|-------------|----------------| | Loose encoder cable | High | No | | Broken cable | High | No | | Defective encoder (pulse coder) | Medium | Yes | | Defective servo drive (amplifier) | Low | No | | Noise / grounding issue | Medium | No | | Motor magnetic pole shift | Very low | Maybe (motor repack) |
To pinpoint the root cause, technician must look past the CNC screen and inspect the 7-segment LED display directly on the Fanuc Servo Amplifier Module inside the electrical cabinet: fanuc 414 servo alarm z axis detect error repack
The error occurs when the CNC detects abnormal current flow or a feedback failure. Key causes include: | Cause | Likelihood | Repack needed
The Z-axis frequently moves up and down. Over millions of cycles, the encoder cable can develop a broken wire within the cable carrier (drag chain). The error may appear only when the axis is at a specific height. 3. Faulty Pulse Coder (Encoder) Over millions of cycles, the encoder cable can