Fanuc Wn57 Override Function Is Active ⚡

The operational impact of the WN57 alert is immediate and significant. The machine will likely enter a "feed hold" state or refuse to execute cutting commands at programmed speeds. In some configurations, the machine may lock the override at 0% or a minimal jogging speed, rendering it unable to perform automatic operations. This is a protective measure; without valid parameters, the tool path calculations could be erroneous, leading to tool breakage, part scrap, or collision with fixtures.

While it typically does not lock the control panel, leaving this function active can cause unexpected program execution speeds, cycle time fluctuations, or accidental safety risks. Understanding how to diagnose, navigate, and clear this warning is essential for maintaining production efficiency and shop floor safety. Technical Context: What Does WN57 Mean?

In FANUC parlance, an "override function" is any feature that temporarily suspends standard automatic operation. The most common culprits include:

While it is just a warning, ignoring WN57 Override function is active can lead to serious issues: fanuc wn57 override function is active

If none of the above works, and you are certain no physical overrides are active:

If you want, I can tailor this write-up for a specific FANUC series (e.g., 0i, 16i/18i, 21i) or draft a short diagnostic checklist formatted for printing.

The WN57 alarm (or status message) on a FANUC CNC control indicates that an override function is currently enabled – typically a rapid traverse override , feed rate override , or a dry run override . Unlike many alarms, WN57 is generally an informational message , not a critical error. The machine will continue to run, but with altered motion parameters. The operational impact of the WN57 alert is

Press the [Reset] button to clear temporary custom PMC overrides.

He pressed the Reset button. The message flickered, held for a second, and reappeared. The spindle sat locked. The axis motors hummed a low, waiting tone, but the G-code execution was paused. The machine was effectively saying, I’m not moving until you look at what I’m seeing.

The message on a Fanuc control typically indicates that the machine's feedrate or speed override is being controlled by an external source or a specific internal safety setting, rather than the manual dial on the operator panel. Why This Message Appears This is a protective measure; without valid parameters,

Automated cells may experience timing desynchronisation between the CNC machine and external automation layers. Step-by-Step Troubleshooting and Resolution

The phrase means the CNC machine is running under modified speed or safety parameters. An override switch on the operator panel has been turned away from its standard 100% position, or a specific software safety override has been triggered in the PMC (Programmable Machine Control) ladder logic. Common Causes of the WN57 Warning

Does the warning appear during or during manual jogging (JOG) ?

"Maybe it's not the dial," Marcus suggested, setting his coffee down. He pointed to a small, unassuming button on the lower right of the panel, partially obscured by a chip guard. "Check the Dry Run switch."