= “Servo Alarm: Z-axis – Detect Error.” This means the CNC control unit commanded the Z-axis motor to move, but the Position Coder (pulse coder) or the servo system failed to return a valid feedback signal within the expected parameters. It’s essentially a “loss of control” alarm.
Take the motor off the Z-axis and try to move the ball screw by hand. If it is hard to move, the issue is mechanical (gib adjustment, ballscrew, or slideways lubrication). fanuc 414 servo alarm z axis detect error