Example 3 — Spindle tuning during finish pass
If the WN57 warning is preventing your machine from executing cycles at full speed, follow these diagnostic steps to locate the source: Step 1: Check Physical Panel Switches Inspect the Machine Control Panel (MCP). Ensure that: The dial is set to The Spindle Speed Override dial is set to The Rapid Traverse Override buttons ( ) are set to normal operating parameters. The Dry Run switch is toggled off. Step 2: Verify the Key Switch and Door Interlocks
: Forced signals may prevent the PMC from responding to real sensors or operator inputs. fanuc wn57 override function is active
The WN57 alarm appears when the feature is active. This tool is primarily used by developers or maintenance technicians during the debugging process to:
On FANUC 0i-D and later, press the [SYSTEM] button, then the [CONDITION] soft key. This displays a live status of all overrides (MLK, DRY, SBK, AUX). Make this your default screen during setup. Example 3 — Spindle tuning during finish pass
This status is often triggered when a user or technician is "forcing" I/O points to test logic without actually firing physical sensors or switches. On newer controls like the Series 30i/31i/32i, an
Find the field labeled (or similar terminology). Move the cursor to this option and set it to "NO" or "0" . Step 2: Verify the Key Switch and Door
The message is a specific PMC (Programmable Machine Control) alarm found on FANUC CNC systems . It indicates that the Override Function —a debugging tool used to manually force PMC signals—is currently enabled .
FANUC alarms are categorized by prefixes:
If you'd like to know the to disable this warning or how to lock the override at 100% for production, just let me know! Four Ways to Control FANUC Robots' Speed Override
In conclusion, the Fanuc WN57 override function is a valuable feature that allows operators to adapt to changing machining conditions, optimize the cutting process, and improve tool life. By understanding how to use this function effectively and safely, operators can unlock its full potential and enhance their machining productivity.