The alarm occurs immediately upon powering up the drives.
Open the electrical cabinet and look at the digital display or status LEDs on the Fanuc Servo Amplifier Module (SVM). fanuc 414 servo alarm z axis detect error
If you have multiple identical axes, you can swap the cables or drives. If the alarm stays on the Z-axis, the problem is the motor or cable; if it follows the drive, the amplifier is the culprit. The alarm occurs immediately upon powering up the drives
High Voltage Alarm. The DC link voltage is excessively high, often due to regeneration failure. if it follows the drive
Verify that 24VDC is actively delivered to the brake circuit when the machine axes are enabled.