Coolant finds its way everywhere. If the connector on the back of the Z motor has oil or coolant inside, it shorts the 5V differential signals (PS, *PS).
If the motherboard or SRAM battery dies during the re-pack downtime, the servo parameters (Parameter 2000 series) may be lost. Without these parameters, the control does not know how to "talk" to the Z-axis amplifier, resulting in a communication error (Detect Error).
Start: Alarm 414 on Z
│
▼
Check cables & connectors → Loose/bad? → Yes → Fix → Reset alarm
│ No
▼
Swap motor with another axis (if possible)
│
▼
Alarm moves? → Yes → Motor encoder faulty → Go to Repack
│ No
▼
Alarm stays on Z → Check servo amp & CNC feedback board
│
▼
Replace servo amp or cable → Still alarm? → Replace motor
Safety Warning: The Z-axis can drop. You must mechanically block the spindle head before disconnecting anything. Use a 4x4 wooden post or a mechanical jack stand.
You cannot fix a problem you do not understand. Here are the six primary reasons for this alarm, ranked by probability.
Before diving into diagnostics, perform a physical check of the re-pack work:
| 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) |
"alarm_code": 414,
"axis": "Z",
"title": "Servo Detect Error",
"priority": "High",
"repack_required": true,
"steps": [
"check_cables",
"swap_test",
"encoder_replacement",
"parameter_1815_reset",
"zero_return"
],
"torque_specs":
"encoder_screws": "0.6 Nm",
"motor_mount": "12 Nm"
,
"video_link": "https://yourdomain.com/414-repack.mp4"
