Verify that the override function remains disabled on production machines.
💡 : To find the exact trigger, go to the PMC Maintenance screen and search for the address associated with Message WN57 . This will show you the exact ladder rung and the inputs required to satisfy the condition. Reference Documentation
FANUC alarms are categorized by prefixes: fanuc wn57 override function is active
In many systems, this function is tied to a specific keep relay. Setting K906.0 to "0" will often immediately deactivate the override function and clear the WN57 message.
Bookmark the override status screen on your FANUC control. It is the fastest path to diagnosing WN57 and getting back to cutting chips. Verify that the override function remains disabled on
To clear this message and return the machine to standard operation, you must turn off the override function: Via PMC Parameters Navigate to the PMC Setting screen on your FANUC control. Find the option for Override Effective Set this value to Restart the CNC to clear the alarm. Via Keep Relay (K-Address) Directly change the keep relay
Usually mapped to custom PLC/PMC logic to lock, limit, or force a specific override percentage, overriding the standard operator panel knobs. Operation: It is the fastest path to diagnosing WN57
"She’s really not liking it," Elias said, frustration creeping into his voice. "It’s like the system thinks the dial is stuck at zero, even though the screen says 100%."
On newer FANUC i-Series (Series 0i-F, 31i-B5), overrides can be triggered via soft keys:
What is experiencing the error (e.g., mill, lathe, multi-axis)?
If the feedrate or rapid override is set below 100%, the machine moves slower than programmed. This increases total cycle time and lowers production efficiency. 2. Risk to Surface Finish and Tool Life