Fanuc Wn57 Override Function Is Active

Here’s a useful, practical review of the "FANUC WN57 Override Function is Active" message, written for CNC operators and setup personnel.

However, WN57 is typically a built-in safety feature for FANUC Series 0i, 16i, 18i, 21i, and 31i controls. fanuc wn57 override function is active

Best Practices for Using the FANUC WN57 Override Function Here’s a useful, practical review of the "FANUC

  1. Dry Run (G12 or Dry Run switch)
  2. Single Block (Excessive use in specific modes)
  3. Machine Lock (All axes frozen)
  4. Auxiliary Function Lock (M, S, T, B functions disabled)
  5. Program Restart / Block Search (Incomplete search)
  6. Handle Interrupt / Handle Feed

FANUC WN57 Override Function — Complete Write-up

Overview

WN57 on FANUC CNC controls indicates that the machine is running with an active feed override or rapid override function tied to a safety or watchdog feature that modulates axis motion. It’s commonly seen as a displayed override status (often in the MPG/MDI or alarm/message area) when the control has detected a condition where commanded motion has been limited or overridden by the system. The exact behavior and causes vary by FANUC series and machine OEM implementation. Dry Run (G12 or Dry Run switch) Single

Variable Speed Control: You can manually adjust the feedrate (Feedrate Override) or rapid traverse (Rapid Override) percentages using the dials or buttons on the control panel.

Tool Protection: By slowing down the motion during the first run of a new tool or part, you can stop the machine quickly if the tool path looks incorrect. Why You See the WN57 Message

While the FANUC WN57 override function is designed to be reliable and user-friendly, issues can arise. Common problems and their solutions include: