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Check Current Program S Code

Press CURRENT COMMANDS and verify the S value shown in the spindle speed field against your program.

Use EDIT SEARCH to find all S codes in your program quickly

Verify Parameter 230 Setting

Navigate to SETTING > PARAMETERS > enter 230 > press WRITE/ENTER to view the maximum spindle speed parameter.

Do not change Parameter 230 without consulting machine specifications

Correct Program or Override

Either edit the S code in your program to a value below Parameter 230, or use spindle speed override to reduce the effective speed.

Set spindle override to calculate: (Parameter_230 / Programmed_S_Code) × 100

Check Spindle Gear Parameters

View Parameters 231 (Low Gear Max Speed) and 232 (High Gear Min Speed) in SETTING > PARAMETERS to identify gear range limits.

Parameter 231 should be less than Parameter 232 for proper gear overlap

Verify Current Gear State

Check CURRENT COMMANDS display for gear indicator or manually verify spindle gear position if equipped with manual gear selection.

Never force manual gear changes while spindle is rotating

Adjust Program Speed or Force Gear Change

Modify S code to fall within current gear range, or add M41/M42 gear selection commands before the problematic S code.

Use M41 for low gear (typically 0-2000 RPM) and M42 for high gear (typically 200-6000+ RPM)

Check Spindle Override Setting

Look at the spindle override percentage displayed on the main screen, typically shown as 'S xxx%' near the spindle speed display.

Spindle override affects the actual commanded speed, not just display speed

Calculate Effective Spindle Speed

Multiply your programmed S code by the override percentage to determine if the result exceeds Parameter 230.

Overrides above 100% can damage spindle bearings and reduce tool life

Reduce Override or Adjust Program

Use the spindle override keys to reduce percentage to 100% or below, or modify the S code in your program to accommodate the desired override level.

Press and hold spindle override down arrow to quickly return to 100%

Compare Parameter 230 to Machine Nameplate

Check the spindle motor nameplate or machine specifications document and compare to Parameter 230 value in SETTING > PARAMETERS.

Setting Parameter 230 higher than machine capability can cause severe spindle damage

Review Parameter Change Log

Check SETTING > PARAMETERS > press PAGE DOWN to view parameter change history if available on your NGC version.

Look for recent changes around the time the alarm started occurring

Restore Correct Parameter Value

Enter the correct maximum spindle speed in Parameter 230, ensuring it matches machine specifications, then press WRITE/ENTER.

Parameter changes may require machine restart to take effect

Check Tool Table Speed Limits

Navigate to OFFSET > TOOL TABLE and examine the current tool's speed limit column if present in your tool table setup.

Tool speed limits are often used for large diameter tools or delicate cutters

Verify Current Tool Number

Check CURRENT COMMANDS for the active tool number (T code) and cross-reference with your tool table entries.

Tool speed limits override spindle speed limits for safety

Adjust Tool Limit or Program Speed

Either modify the tool's speed limit in the tool table or reduce the programmed S code to comply with the tool-specific limitation.

Consider using surface speed programming (G96) for automatic speed calculation based on tool diameter