Fanuc Wn57 Override Function Is Active |verified|

An operator turns on or Dry Run to test a program quickly. After testing, they switch from MEM mode to EDIT mode to correct a line of code. When they try to switch back to MEM mode and press CYCLE START, the controller refuses and displays WN57. Why? Because the override switches are still physically ON.

Ensure the robot has fully retracted to its "Home" or "Safe" position outside the machine.

Modern machining centers utilize strict safety interlocks. When setting up a job with the enclosure doors open, operators often turn on a setup switch or a key-switch (such as a hardware override mode) to manually jog axes or spin the spindle at reduced speeds. If this key-switch is left in the setup position, or if the door interlock bypass is active, WN57 will stay triggered. 3. Dry Run or Feedrate Override Switches

If you encounter this warning frequently, it indicates an opportunity to improve operator training or refine your setup procedures. Remember: The machine is not broken; it is simply waiting for you to acknowledge that an override is still engaged.

The message typically appears when the system detects that the or a related custom PMC (Programmable Machine Control) function has been engaged. fanuc wn57 override function is active

or less). The WN57 warning serves as a visual reminder that this safety override is currently controlling the machine. 3. Dry Run Function Enabled

Example 1 — First-piece slowdown

Look up the specific G-signals assigned to overrides by your machine builder (commonly for Feedrate Override signals).

Does the warning prevent the machine from , or is it just a visual alert? Share public link An operator turns on or Dry Run to test a program quickly

Understanding the FANUC WN57 "Override Function is Active" Alarm

To understand the error, one must first understand the function of an override. In CNC operations, an "override" allows the operator or the system software to adjust the programmed feed rate or spindle speed in real-time. For instance, if a program commands a feed rate of 1000 mm/min, a 50% override would reduce the actual movement to 500 mm/min. This is critical for safety during setup, dry runs, or when machining difficult materials. However, the WN57 message indicates an anomaly. Under normal circumstances, a feed rate override is a standard, expected input. The "WN57" code, however, suggests that the override is not merely a user input but a symptom of a deeper, often automated, safety intervention triggered by system instability.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

Verify that the mode selection switch is firmly seated in or Tape/DNC , not between positions. Modern machining centers utilize strict safety interlocks

: The message may appear if the machine is in Dry Run mode or if a Machine Lock function is active.

Safety. If Machine Lock is on, the position display moves, but the actual table does not. Running a program normally would crash the tool. WN57 is a prevention alarm , not an error. It forces the operator to consciously acknowledge the override condition.

Look at the current program execution screen. Check if a modal G-code is forcing an override state. For example, some machine setups utilize specific macro variables or regional

The WN57 message triggers when the physical override dials on the operator panel are set away from 100%, or when a software-driven override is applied through the PLC (Programmable Logic Controller).

Walk up to the operator panel and verify the positions of the manual override dials: