Running a tool at a lower feed rate than programmed alters the chip load, potentially causing tool chatter, work hardening, or poor surface finishes on the workpiece. Step-by-Step Troubleshooting and Resolution
The override function is directly linked to the system address .
FANUC controls utilize overrides to give operators real-time manual control over the machine's programmed speeds. When WN57 appears, the control is letting you know that the program is not running at its pure, natively engineered speeds and feeds. Common Causes of the WN57 Warning 1. Feedrate Override Switch is Not at 100%
Because WN57 is an "active" status rather than a failure, it can usually be resolved by toggling the function off through the CNC’s internal settings or by modifying a specific Keep Relay ( -address). Method 1: Using the PMC Parameter Screen Navigate to the on your FANUC controller. Select [PMC SET] or [PMC PARAM] . Look for the Setting or Override sub-menu. fanuc wn57 override function is active
Working with the override function and resolving the WN57 alarm requires specific competencies:
Look up the specific G-signals assigned to overrides by your machine builder (commonly for Feedrate Override signals).
: Feed Zero—occurs if the override dial is at 0% while a cutting command is issued. AI responses may include mistakes. Learn more Running a tool at a lower feed rate
If you want, I can produce a short checklist tailored to your machine model (e.g., FANUC Oi-MF, 32i-A) showing exact keys/screens to inspect.
Select the softkey, then navigate to STATUS or DIAGNOSIS .
CNC machines utilize overrides to allow operators to manually speed up or slow down automated programs in real time. When the system throws the WN57 warning, it informs the operator or an external automation system (like a robotic loader) that the machine is not running at its exact programmed velocities. Common Causes of the WN57 Alert When WN57 appears, the control is letting you
: Check the MTB's manual for specific Keep Relays (K) or Data Table (D) settings. Builders often use these to "latch" an override active for specific tasks.
: When this function is active, it indicates that the machine's programmed feedrates or spindle speeds are being scaled by a manual selector or a software override. This is critical for operators to know if the machine is running at 100% of its programmed speed or a safer, reduced percentage (e.g., during Manual Handle Feed ).
If you see this message and need to clear it, check the following:
During setup, this warning confirms that safety features are working. It ensures the machine is restricted to safe, slow speeds while the operator validates a new program. How to Clear and Resolve the WN57 Warning