| Suspect | Confirmation Test | |---------|--------------------| | | Continuity test while flexing cable (especially near motor end). | | Encoder | Swap Z motor with X motor (mechanical permitting). Does 414 follow motor? | | Servo amplifier | Measure 5V under load. If 5V drops when encoder plugged in – amp short. | | CNC motherboard | Extremely rare. Swap Z and Y axes in parameters (PRM 1023). |
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. fanuc 414 servo alarm z axis detect error
The Z-axis on a CNC machine is unique compared to the X and Y axes because it constantly fights against gravity. It relies heavily on a counter-balance system (either hydraulic or nitrogen gas cylinders) or a brake mechanism to hold its position. When a 414 alarm triggers on the Z-axis specifically, it suggests that the control cannot verify the position, speed, or movement of this heavy vertical component. | | Servo amplifier | Measure 5V under load
If the control cannot "see" where the Z-axis is, it will trigger a detection error. The alarm triggers only when the axis moves. Swap Z and Y axes in parameters (PRM 1023)