What causes FANUC alarm 025?

Machine system or function indicated by the alarm name has detected a fault. Control parameter or configuration error related to the alarm condition. Hardware component fault on the CNC or machine. Part program error or illegal operation for the indicated function. Machine interlock or safety condition not satisfied.

How do I fix FANUC alarm 025?

1. Note the alarm number and check the Fanuc alarm screen for any sub-code or additional details. 2. Identify the specific machine system or function from the alarm name. 3. Power cycle the machine to clear transient faults. 4. Consult the Fanuc parameter or operator manual for alarm 025 specific remedy. 5. Contact Fanuc service if the alarm persists after basic troubleshooting.

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FANUC Controller

Program/G-code · Basic · 5-15 minutes

Alarm 025

Fanuc Alarm 025 - CIRCLE CUT IN RAPID (F0)

Alarm 025 occurs when the CNC detects a feedrate command of F0 (rapid traverse) during a circular interpolation block (G02 or G03). This is a programming error as circular moves require a controlled feedrate for proper arc generation and cannot execute at rapid traverse rate.

FANUCProgram/G-codeBasic5-15 minutes

025

Fanuc Alarm 025 - CIRCLE CUT IN RAPID (F0)

SYSTEM ALARM 25

Root Cause Summary

Alarm 025 occurs when the CNC detects a feedrate command of F0 (rapid traverse) during a circular interpolation block (G02 or G03). This is a programming error as circular moves require a controlled feedrate for proper arc generation and cannot execute at rapid traverse rate.

Causes and Fixes

1
Review the program block identified in the alarm display. Check for F0 specified in or before the G02/G03 block causing the alarm.
2
Verify that a valid feedrate (F__) is programmed in the circular interpolation block or in a preceding block in the same program mode. Check if feedrate was cancelled by a previous rapid move (G00).
3
Correct the program by adding an appropriate feedrate value (e.g., F500) before or within the G02/G03 block. Ensure feedrate units match Parameter 0000 bit 0 (metric/inch) settings.
4
Re-run the program from a safe position using single block mode (SINGLE BLOCK button ON) to verify the circular interpolation executes with proper feedrate.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter 1401 corruption
·Modal display shows incorrect values
·Alarm persists after program correction

Prevention

Always program F value with G02/G03 commands
Use program templates with proper modal initialization
Implement program verification procedures

Common Mistakes

Assuming F0 is valid for circular moves
Not checking modal feedrate status
Copying rapid move blocks for interpolation moves

Related Alarms

010 020 033 034

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