Fanuc 414 Servo Alarm Z Axis Detect Error -

These diagnostic screens will display a binary code revealing the specific type of detection error:

Alarm 414 occurs │ ▼ Can you manually move Z-axis (handwheel)? ├─ NO → Brake likely stuck OR mechanical lock │ → Check brake relay / voltage │ ▼ Jog Z-axis while watching DGN 204 ├─ 204 = 0 → No feedback → Replace encoder cable or pulse coder ├─ 204 moves but jerky → Mechanical binding or motor magnet loss ├─ 204 matches command but error large → Increase parameter 1828 temporarily (test only) │ ▼ Swap servo drive with another axis ├─ Fault moves to X or Y → Replace drive ├─ Fault stays on Z → Motor or cable problem fanuc 414 servo alarm z axis detect error

Check the pulse coder cable (feedback cable). Ensure it is shielded and not running too close to high-voltage lines, which can cause electrical noise interference. 📋 Step-by-Step Troubleshooting Flow These diagnostic screens will display a binary code

A Fanuc 414 Servo Alarm on the Z-axis signals a "Digital Servo System Abnormal" error, frequently caused by high current, low voltage, or hardware failure in the servo amplifier, motor, or cabling. Key diagnostic steps involve checking Diagnostic No. 200 for error bits and inspecting the servo amplifier for LED codes (e.g., 8, 9, A for high current). Recommended troubleshooting includes megohmmeter testing of cables, isolating the amplifier, and checking for mechanical binding in the Z-axis. For detailed diagnostic procedures, visit TIE FanucWorld Diagnose a Fanuc High Current Alarm in 10-Steps 📋 Step-by-Step Troubleshooting Flow A Fanuc 414 Servo

Look at the servo amplifier's internal LED. An 8, 9, or A indicates which axis channel is failing (8 for the first axis, 9 for the second).