Fanuc Series 6M/6T Alarm 442

Fanuc CNC Major System Alarm

Model: FANUC Series 6M / 6T | Code: 442

Applicable Systems
Series 0i Series 16/18/21 Alpha Beta

Symptoms

Alarm 442: Drift in 4TH axis is excessive. (Exceeds 500VELO). The Fanuc Series 6M/6T CNC system displays this alarm on the operator panel.

Possible Causes

  • Refer to the machine manual for detailed cause analysis
  • Check related sensors, switches, and parameters

Troubleshooting Steps

  1. Step 1: Read alarm 442 on the CNC display and note the full alarm message
    Alarm code and description displayed for diagnosis
  2. Step 2: Check the machine status and identify any obvious mechanical, electrical, or pneumatic issues
    Visible faults identified or confirmed as intermittent
  3. Step 3: Consult the manufacturer manual for alarm-specific troubleshooting procedures
    Root cause identified per manufacturer guidelines
  4. Step 4: Apply the recommended fix and reset the alarm
    Alarm cleared and machine resumed normal operation

How to Reset

To reset alarm 442: 1) Address the root cause. 2) Press the RESET key on the CNC panel. 3) If the alarm persists, cycle power to the control. Caution: Repeated alarms without fixing the cause may cause damage.

Frequently Asked Questions

  • Q: What does alarm 442 mean?

    Alarm 442 corresponds to: Drift in 4TH axis is excessive. (Exceeds 500VELO). This is a Series 6M/6T system alarm that typically requires checking machine state and the manufacturer manual.

Related Fanuc Fault Codes

Source: HelmanCNC.com - https://www.helmancnc.com/fanuc-6-alarms-fanuc-6m-6t-alarm-codes/

Category: CNC