Fanuc 414 Servo Alarm Z Axis Detect Error Repack -

= “Digital servo alarm”

Based on decades of field repair experience and documented case studies, 414 alarms can be categorized into the following root causes:

: Shows 414 SERVO ALARM: Z AXIS DETECT ERR (or SERVO ALARM: Z-V AXIS DEFEKT ERR ). fanuc 414 servo alarm z axis detect error repack

The Fanuc 414 alarm (specifically "Detect Error" or "Disconnect") implies that the CNC control has lost communication with the feedback device or is receiving invalid data. Unlike an "Overload" alarm (which suggests mechanical binding) or an "Overcurrent" alarm (suggesting a short), a 414 alarm is an .

: The electromagnetic contactor (MCC) drops out, disabling all axis movements instantly. Deep-Dive Diagnostics: Finding the Root Cause = “Digital servo alarm” Based on decades of

The 414 alarm is a "system-level" notification. To find the root cause, you must look deeper into the machine's diagnostics: CNC Diagnostics: Diagnostic No. 200 or 204

: Bit #4 (HCA) indicates abnormal current; Bit #5 (OVC) indicates overcurrent. : The electromagnetic contactor (MCC) drops out, disabling

The Fanuc 414 servo alarm “Z axis detect error — repack” typically indicates that the Z-axis servo drive or motor has a feedback/position-detection problem caused by mechanical issues, encoder/ resolver faults, cabling/connectors, or internal drive faults. “Repack” in this context often refers to reassembly/servicing the encoder/ resolver, connectors, or motor housing (sometimes done after bearing replacement or motor repair). This article explains causes, diagnostics, step-by-step troubleshooting, and recommended repairs to restore reliable Z-axis control.