If the alarm , the issue is in the motor or cables .
In the Fanuc control system, a 414 alarm signifies that the has flagged an issue. While the 414 code tells you "which" axis is failing (Z-axis), the diagnostic bits tell you "why." Check Diagnostic 200 (Z-Axis) Before replacing parts, check the diagnostic screen: Bit 2 (HCAL): High current alarm. Bit 5 (OVC): Overcurrent/Overload. Bit 6 (LV): Low voltage. Bit 7 (OV): Overvoltage. 🛠️ Common Causes and Solutions 1. Faulty Servo Amplifier The Z-axis servo amplifier is the most frequent culprit. fanuc 414 servo alarm z axis detect error
The Z-axis is particularly susceptible to this alarm due to the constant stress of gravity and vertical movement. Common culprits include: If the alarm , the issue is in the motor or cables
: Use a megohmmeter (megger) to check insulation between motor phases and ground. A reading below 500 MΩ often indicates a short Check for Overheating Bit 5 (OVC): Overcurrent/Overload
| Machine Type | Most Common Fix | | :--- | :--- | | | Z-axis brake relay/contactor failed, or brake not receiving 24V. | | Lathe (Z-axis is bed) | Encoder cable damaged from chip swarf or coolant ingress. | | Old FANUC (DC servo) | Brush wear or tachometer generator failure. | | High-cycle machine | Motor power cable intermittent break near cable track. |
: Failure of the Intelligent Power Module (IPM) within the drive module, which delivers current to the motor Contamination
When the FANUC 414 servo alarm occurs, you may notice: