What causes FANUC alarm PS0201?

Feed rate does not match spindle speed × thread pitch. Z-axis servo unable to follow the commanded feed during tapping. Rigid tapping parameters not configured for the installed spindle type. Spindle drive fault during the rigid tap cycle. Mechanical binding on the Z-axis causing feed lag.

How do I fix FANUC alarm PS0201?

1. Verify the feed rate equals spindle speed × thread pitch (F = S × pitch). 2. Check the spindle encoder cable and connector for the tapping spindle. 3. Confirm the spindle has fully accelerated to commanded speed before G84/G74 starts. 4. Review rigid tapping parameters for correct spindle type configuration. 5. Run at reduced speed first to confirm synchronization works before returning to full speed.

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FANUC Controller

Program/G-code · Basic · 10-15 minutes

Alarm PS0201

Fanuc Alarm PS0201 - Rigid Tapping Feedrate Not Set

Alarm PS0201 occurs when a rigid tapping cycle (G84 or G74) is executed without a proper F code (feedrate) programmed, or the feedrate/spindle speed relationship is incorrect. The CNC cannot calculate the required synchronization between spindle rotation and Z-axis feed for rigid tapping operations.

FANUCProgram/G-codeBasic10-15 minutes

PS0201

Fanuc Alarm PS0201 - Rigid Tapping Feedrate Not Set

Rigid Tap Feedrate Error

Root Cause Summary

Alarm PS0201 occurs when a rigid tapping cycle (G84 or G74) is executed without a proper F code (feedrate) programmed, or the feedrate/spindle speed relationship is incorrect. The CNC cannot calculate the required synchronization between spindle rotation and Z-axis feed for rigid tapping operations.

Safety

Tap may break without proper feed

Causes and Fixes

1
Review the NC program at the alarm occurrence line. Verify G84 or G74 block contains an F code with non-zero value. Format should be: G84 Z__ R__ F__ (with S__ active).
2
Check if feedrate was cancelled by previous G80 or other modal command. Ensure F code is programmed in or before the tapping cycle block.
3
Verify parameter 5200 (Rigid Tap Mode) bit settings: bit 0 enables rigid tapping function. Navigate to SYSTEM > PARAM > search [5200] and confirm bit 0 = 1.
4
Recalculate feedrate: F = Thread Pitch × Spindle Speed (RPM). For M6×1.0 thread at S1000: F should equal 1000 mm/min. Modify program with correct F value and re-execute.

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