16710

Review the NC program block listed in the alarm (%2). Verify that an S parameter (spindle speed in RPM or SFM) is present in the same block or was set in a preceding preparatory block.

Check for S0 commands that may have disabled spindle speed; these are functionally equivalent to missing S parameters.

Confirm spindle enable status by checking MD 35100 (SpindleEnable) and verify the spindle is not inhibited via SD (setting data). Navigate to Diagnostics > Parameters > MD and search MD 35100.

Add or restore the S parameter in the offending block. Example: 'G33 S500 M3 Z100' for thread cutting at 500 RPM. Ensure S value matches the machine's spindle capability per machine data MD 35010 (SpindleMaxSpeed).

Reset the alarm (Delete/Clear Alarm), re-execute the corrected block, and monitor spindle speed feedback via Diagnostics > Spindle > Actual Speed display.

Inspect the NC program block (%2 in alarm). Verify M3, M4, or M5 is explicitly programmed in the synchronization block or check if a previous modal spindle direction is active via NC program history.

M5 (spindle stop) cannot be used with G33, G331, G95, or G96; the spindle must rotate for synchronization functions.

Add the appropriate M-code: M3 for clockwise (typical for forward threading or feed-per-rev), M4 for counter-clockwise. Example: 'G33 S800 M3 Z-50' for thread cutting.

Verify spindle direction output by checking machine I/O diagnostics: Diagnostics > I/O > Digital Outputs > search for spindle direction bit (typically linked to parameter MD 35012, SpindleDirectionReversed).

Clear the alarm, re-execute the block with the M-code, and visually confirm spindle rotation direction matches the programmed M3/M4 intent.

Navigate to Diagnostics > Parameters > Machine Data and verify MD 35001 (SpindleControlType) is set to 2 (synchronous/regulated spindle). If set to 0 or 1 (unregulated), master spindle functions are not supported; reconfigure if required.

Changing MD 35001 may require a machine restart and PLC compilation.

Confirm the spindle is assigned to the correct channel via MD 35002 (SpindleChannelNumber). Verify this matches the channel (%1) executing the G33/G331/G95/G96 command in the alarm message.

Check MD 35010 (SpindleMaxSpeed) and MD 35011 (SpindleMinSpeed) are properly defined with realistic values (e.g., 50–6000 RPM for typical CNC spindles). Undefined or zero values may prevent synchronization.