When the CNC displays "414 SERVO ALARM: Z AXIS DETECT ERROR," it means the Servo Amplifier has detected an abnormality in the feedback loop or the power circuit. This is often accompanied by a specific diagnostic code in the screens, which helps pinpoint whether the issue is a broken wire, an LV (Low Voltage) fault, or a current overflow. 2. Common Causes
If a high-current device (spindle drive, coolant pump) is dumping noise onto the ground line, the servo drive’s position detection circuit can misinterpret feedback. Fix: Check that motor feedback cable shield is grounded at only the control end, not both ends. fanuc 414 servo alarm z axis detect error
Fanuc 414 Servo Alarm on the Z-axis indicates a digital servo system fault where the CNC has detected an abnormality in the servo drive or its feedback circuit. Because the Z-axis is vertical, it is often subject to higher mechanical stress and specific failure modes like brake malfunctions or counterweight imbalances. TIE Industrial Fanucworld Initial Diagnostic Steps To pinpoint the exact cause, refer to the CNC Diagnostic Screen Servo Amplifier LED CNC Diagnostics Diagnostic No. 200 HCA (Bit 4) When the CNC displays "414 SERVO ALARM: Z
Troubleshooting should be performed by trained personnel as high voltage is present in the electronics cabinet. Diagnose a Fanuc High Current Alarm in 10-Steps Common Causes If a high-current device (spindle drive,
: Use a megohmmeter (megger) to check insulation between motor phases and ground. A reading below 500 MΩ often indicates a short Check for Overheating
If your machine uses a hydraulic or nitrogen counterbalance for the Z-axis, ensure it is pressurized correctly. An unweighted Z-axis puts massive strain on the servo, leading to OVC (Overcurrent) alarms.