The alarm is triggered when the CNC control and servo amplifier detect a problem that prevents the axis from operating correctly. This could be anything from incorrect voltage reaching the amplifier to a physical problem with the motor itself.
Bit #6 (OFS) indicates an A/D converter error within the amplifier. 3. Step-by-Step Troubleshooting Procedure
| Cause | Likelihood | Repack needed? | |--------|-------------|----------------| | Loose encoder cable | High | No | | Broken cable | High | No | | Defective encoder (pulse coder) | Medium | Yes | | Defective servo drive (amplifier) | Low | No | | Noise / grounding issue | Medium | No | | Motor magnetic pole shift | Very low | Maybe (motor repack) | fanuc 414 servo alarm z axis detect error repack
If the motherboard or SRAM battery dies during the re-pack downtime, the servo parameters (Parameter 2000 series) may be lost. Without these parameters, the control does not know how to "talk" to the Z-axis amplifier, resulting in a communication error (Detect Error).
Indicates an abnormal high current or short circuit in the amplifier circuit, motor windings, or power cables. The alarm is triggered when the CNC control
Thoroughly flush the ball nut housing and the screw threads with solvent to eliminate carbonized grease and debris. Inspect the internal helical tracks for pitting, scoring, or flaking.
[ 414 Z-Axis Alarm Occurs ] │ ┌──────────────┴──────────────┐ [ Power Cycle ] [ Check LED on Amp ] │ │ Does alarm clear immediately? Is it 8, 9, or A? ├── Yes -> Intermittent ├── Yes -> Short Circuit Test └── No -> Persistent └── No -> Check Comm/Voltage Step 1: Perform an Insulation and Ground Test (Megger Test) Turn off the main machine breaker and lock out power. Without these parameters, the control does not know
It should always be your first step before calling a FANUC service technician who will charge $500 just to walk in the door.
Never guess with a Fanuc 414 alarm; swapping parts blindly can damage new modules. Use the built-in CNC diagnostics and electrical tests to narrow down the fault. Step 1: Check Fanuc Diagnostic Parameters
When the 414 alarm appears, the CNC control points to a general detection error. To identify the root cause, you must look at the physical LED display on the and the diagnostic bits in the CNC control. 1. Check the Servo Amplifier LED
To pinpoint the root cause, technician must look past the CNC screen and inspect the 7-segment LED display directly on the Fanuc Servo Amplifier Module inside the electrical cabinet: