Fanuc Wn57 Override Function Is Active Today

Look up the feedrate override signals ( for bits *OV0 to *OV7 ). A broken wire or failed rotary switch contact can send a continuous override signal to the control, even if the physical knob points to 100%. Summary for Operators

When operating a FANUC-controlled CNC machine, safety parameters constantly monitor the system to protect both the operator and the equipment. One specific status message that operators encounter is the warning.

An operator has manually locked a feed rate or spindle speed override.

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.

The spindle speed dial is adjusted away from the standard 100% mark. fanuc wn57 override function is active

When the Dry Run toggle switch or softkey is activated, the machine executes programmed feedrates at a fixed, rapid dry-run speed defined in the system parameters. Because this overrides the programmed F codes, the WN57 function flag becomes active. 3. Tool Setter / Probe Override Functions

If the message remains on the screen after physical checks, the override signal is likely locked in the PMC logic. Access the screen.

: Ensure that operators are adequately trained and understand the implications of activating and adjusting the override function.

Check the physical knobs on the operator panel. Turn the and Spindle Speed Override switches back to exactly 100% . Ensure Rapid Traverse is set to normal operating limits. Step 2: Deactivate Setup Modes Look up the feedrate override signals ( for

Did this alarm appear , or right at machine startup ?

Understanding the FANUC WN57 Override Function Is Active Warning

While this function is active, the PMC may not operate according to its standard programmed logic because signals are being "overridden" for testing purposes. It is generally recommended to disable this function once debugging is complete to ensure normal machine operation .

Always check the current operation of your machine when this message appears. If the machine is performing a normal cycle, the message can usually be ignored, or it will disappear once the specialized cycle finishes. One specific status message that operators encounter is

Knowing these details will help isolate the exact safety or parameter trigger. Share public link

What is the exact (e.g., 0i-F, 31i) on your machine?

, disengage the Dry Run or Setup keys, close all safety guarding, and press the button on the MDI panel.