Fanuc Wn57 Override Function Is Active !!top!! Jun 2026
In rare cases, a loss of CMOS memory or a failing backup battery can cause parameters and keep relays to scramble, potentially "flipping" the bit for the override function.
Find the that triggers this in your manuals Let me know how you'd like to narrow down the solution . Share public link
To clear this alarm and return the machine to its standard operating state, you must turn off the override function: Via PMC Parameters Screen: Navigate to the PMC Parameter setting screen on your CNC control. Locate the (倍率) function option. Move the cursor to this setting and change it to "Disabled" Restart the CNC to clear the alarm. Via Keep Relay (K-Address): The override function is often mapped to keep relay Directly changing the value of K906.0 to 0
) and the actual axis movement speed—is being manipulated outside of its standard production parameters. This usually happens for one of three reasons: fanuc wn57 override function is active
FANUC documentation explicitly states that this function should be disabled before shipment or returning the machine to regular production. Leaving it active can lead to unexpected machine behavior because the ladder logic may not be executing under its original designed constraints. How to Disable the WN57 Warning
Locate the rotary switch and turn it precisely to 100% .
What (e.g., rigid tapping, probing, automatic cycle start) triggers this code? In rare cases, a loss of CMOS memory
The message is a specific Programmable Machine Control (PMC) alarm found on Fanuc systems, indicating that the system's "Override Function" (倍率功能) has been enabled.
The most frequent cause is simply physical adjustment on the operator panel.
In the world of CNC machining, few things are as frustrating as an unexpected alarm that halts production. Among the myriad of messages displayed on a FANUC controller, one particular notification often causes confusion, especially for operators new to the system: Locate the (倍率) function option
If this "override" or "force" function is left on, it can prevent normal PMC operation, such as closing a door safety interlock or allowing a turret to index, because the system thinks the forced state is the only state. Why Did the WN57 Alarm Appear? The WN57 Override function is active alarm appears because:
The WN57 override function, when activated, allows operators to temporarily modify certain operational limits or settings of the machine. This could include speed overrides, feed rate adjustments, or other parameter changes that are necessary for specific machining tasks. The override function provides flexibility and precision, enabling operators to fine-tune the machining process without permanently altering the machine's standard settings.
The "Override Function" mentioned in this message refers to a specialized tool used by machine tool builders and maintenance technicians to debug the . When this function is active, it allows for the "forced" manipulation of PMC signals—effectively overriding the standard logic of the machine's ladder to test specific behaviors or troubleshoot faulty sensors.
The most common trigger is the physical feedrate or rapid override dial on the operator panel. If the dial is set to a value other than 100% (such as 0%, 25%, or 50%) during a specific G-code command that demands precise timing, the CNC generates the WN57 message to alert the operator that axis movement is intentionally throttled. 2. Dry Run Mode Enabled
Understanding and Resolving the FANUC WN57 "Override Function is Active" Warning