Fanuc Wn57 Override Function Is Active ~upd~ Jun 2026

Provide regular training for maintenance personnel on proper override function usage and deactivation procedures.

Understanding and Resolving the FANUC WN57 "Override Function is Active" Warning

We will cover the underlying logic of FANUC’s protective systems, the specific conditions that trigger WN57, and step-by-step troubleshooting methods for the most common FANUC series (0i, 31i, 30i, and Power Motion i).

If the WN57 message appeared suddenly without manual intervention, it may indicate one of the following scenarios: fanuc wn57 override function is active

On FANUC i-Series controls (such as the 31i, 0i-F, or older 16i/18i models), is an acronym-based system warning code. WN stands for Warning.

Before you panic and reboot the entire machine (which you should avoid unless necessary), follow this systematic checklist.

For machines with Handle Interrupt mode: Provide regular training for maintenance personnel on proper

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.

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"Maybe it's not the dial," Marcus suggested, setting his coffee down. He pointed to a small, unassuming button on the lower right of the panel, partially obscured by a chip guard. "Check the Dry Run switch." WN stands for Warning

The most frequent cause is simply physical adjustment on the operator panel.

The WN57 alarm directly translates to "倍率功能打开" (override function open or override function is active) in Chinese terminology. In simple terms, this alarm appears when the PMC's internal override function is enabled. The override function is a debugging feature that allows technicians to force or override specific PMC signals during program testing and development.