Coolant ingress in motor connectors or power cables is a frequent cause of shorts that trigger this alarm.
Ensure the flexible cable track (energy chain) protecting the Z-axis lines is free of packed metal chips that can pinch or cut cables.
If voltage is present but the motor shaft cannot be turned manually with the power off (and brake manually released), the mechanical brake mechanism is physically seized. Preventive Maintenance Protocols fanuc 414 servo alarm z axis detect error
This is a great topic to dig into. The is one of the more common yet frustrating alarms on Fanuc-controlled CNC machines (like Mori Seiki, Haas (older models), Doosan, Mazak with Fanuc, etc.).
Slightly pulling out and reseating the gray board on the amplifier's front can sometimes fix bad connections. Coolant ingress in motor connectors or power cables
To minimize future occurrences of the FANUC 414 Z-axis alarm, integrate these steps into your standard maintenance intervals:
Internal failure of the motor’s absolute or incremental encoder. Preventive Maintenance Protocols This is a great topic
Swap the feedback cables for the X and Z axes at the amplifier side. Power on the machine carefully.
The Fanuc 414 servo alarm can be caused by various factors, including:
The "detection error" portion of the alarm usually stems from one of three root categories: the Encoder (the sensor), the Drive System (the mechanics), or the Electrical Signal path.
