Because the Z-axis holds the weight of the spindle head or turret, a mechanical lock will instantly trip a 414 alarm. Turn off the main machine power.
When this alarm occurs, the CNC screen displays "414 SERVO ALARM: Z AXIS DETECT ERROR". However, the machine's electrical cabinet provides the specific hardware status:
If the cables are good, the encoder inside the motor may be bad. A replacement motor may be necessary.
To find the precise failure, you must look beyond the main alarm screen and examine the . The Diagnostic Key: Parameter 200 and 204
To help narrow down the exact cause on your machine, could you tell me in Diagnostic 200 or 204 ? If you can also provide the FANUC control series (e.g., 0i-MC, 16i, 21i), I can give you more specific parameter numbers. Share public link fanuc 414 servo alarm z axis detect error
Disconnect it and check for the presence of coolant or moisture.
Because the Z-axis is vertical, mechanical issues manifest differently here than on horizontal axes.
Swap the feedback cables and command cables of the Z-axis with a working axis (such as the X-axis) at the amplifier.
When Alarm 414 is active, you must navigate to the screen on your FANUC control panel to read the binary status bits. The most critical diagnostic numbers for this alarm are No. 200 and No. 204 . Because the Z-axis holds the weight of the
Note which bit is set to 1 . Repeat this check for Diagnostic . Step 2: Perform the "Swap Test" (Isolation)
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Check the cable independently. Any reading below 10 Megohms indicates a breakdown in insulation, meaning the cable or motor must be replaced or rewound. 4. Swap Axis Cables (Isolate the Amplifier vs. Motor)
When faced with a Z-axis 414 alarm, a structured approach to troubleshooting is required to minimize downtime. The Diagnostic Key: Parameter 200 and 204 To
Use a multimeter to check for continuity and shorts to ground across all cable pins. Step 4: Check Motor Insulation (Megger Test)
By cross-referencing the alarm code with the Fanuc maintenance manual, the technician can narrow down whether the issue is a broken wire (detection error) or a heavy load (overload error).
Disconnect the Z-axis motor power cable from the bottom of the servo amplifier.