What causes FANUC alarm 330?

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 330?

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 330 specific remedy. 5. Contact Fanuc service if the alarm persists after basic troubleshooting.

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FANUC Controller

Program/G-code · Basic · 10-20 minutes

Alarm 330

Fanuc Alarm 330 - ILLEGAL AXIS COMMAND IN TURNING CANNED CYCLE

Alarm 330 occurs when a G90, G92, or G94 turning canned cycle contains a commanded axis that is not part of the active plane selection. In turning mode, only X and Z axes (or their equivalent U/W incremental commands) are valid within these canned cycles, yet the program has specified an axis outside this plane such as Y, C, or an invalid incremental command.

FANUCProgram/G-codeBasic10-20 minutes

330

Fanuc Alarm 330 - ILLEGAL AXIS COMMAND IN TURNING CANNED CYCLE

SYSTEM ALARM 330

Root Cause Summary

Alarm 330 occurs when a G90, G92, or G94 turning canned cycle contains a commanded axis that is not part of the active plane selection. In turning mode, only X and Z axes (or their equivalent U/W incremental commands) are valid within these canned cycles, yet the program has specified an axis outside this plane such as Y, C, or an invalid incremental command.

Causes and Fixes

1
Review the exact program block flagged by the alarm. Check for any axis commands other than X, Z, U, W, I, K, R, F within the G90/G92/G94 block.
2
Remove or relocate any Y-axis, C-axis, or rotary axis commands to separate blocks outside the canned cycle. Ensure only radial (X/U) and longitudinal (Z/W) data is within the cycle.
3
Verify parameter 1022 bit 0 (plane selection mode) is set correctly for turning operation. Standard turning uses G18 plane (XZ) by default.
4
Test the corrected program in single block mode (feedhold override) to confirm the canned cycle executes without alarm recurrence.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter changes don't resolve alarm
·Macro programming issues beyond operator skill level
·Suspected control software corruption

Prevention

Always verify turning plane selection before programming canned cycles
Use program simulation to catch axis command errors before runtime
Establish clear programming standards for turning operations

Common Mistakes

Copying milling program blocks into turning programs
Forgetting to remove Y-axis commands when converting from mill to lathe
Incorrect parameter 1022 setting during machine setup

Related Alarms

329 331 010 020

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