The FANUC WN57 alarm indicates that the CNC system is running with an active manual override that limits or alters standard programmed operations.
The FANUC WN57 "OVERRIDE FUNCTION IS ACTIVE" alarm is a crucial indicator that appears on FANUC CNC machine controllers, often causing confusion among machine operators and maintenance personnel. This comprehensive guide will explain everything you need to know about the WN57 alarm, from its fundamental meaning to step-by-step resolution procedures and preventive maintenance strategies.
While the specific implementation varies by machine tool builder, "WN57 Override Function is Active" typically relates to [1]. Here are the most common scenarios: 1. Spindle Override/Override During Rigid Tapping
Find the override function or override enable setting in the PMC parameters.
In FANUC systems, the PMC Override function allows a technician or programmer to manually force specific signals (inputs or outputs) to a desired state, regardless of the actual logic or physical sensor status. fanuc wn57 override function is active
Look at the current program execution screen. Check if a modal G-code is forcing an override state. For example, some machine setups utilize specific macro variables or regional
Troubleshooting the FANUC "WN57 Override Function is Active" Warning
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Only keep the override function active for the minimum time necessary to complete debugging tasks. The FANUC WN57 alarm indicates that the CNC
Implement password protection for parameter changes when available.
When the WN57 alarm is active, you will typically see the following displayed on your FANUC CNC control screen:
The concept of override functions extends beyond the PMC override function specifically indicated by the WN57 alarm. FANUC systems incorporate various override functions for different purposes.
The Machine Tool Builder writes custom PLC/PMC ladder logic to control physical buttons, coolant systems, and safety doors. If a specific system macro variable (such as system variables managing feedrate overrides like #3004 ) has been modified via a custom program or a probing cycle, the control triggers WN57 until that variable is reset to its default state. Step-by-Step Troubleshooting Guide While the specific implementation varies by machine tool
Elias keyed into the Parameter screen, navigating to the diagnostics. He was looking for the system bits that controlled feed hold and override signals. To a novice, the screen was a wall of binary noise—zeros and ones in rows. To Elias, it was a heartbeat.
A useful safety reminder , not a problem. Treat it as a “heads-up” that the machine is not running exactly as programmed. Always check it before running production.
"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%."