104016

Access HMI Diagnostics > Machine Data menu. Navigate to Spindle Parameters section (MD20000-MD20999 range).

Check MD20050 'Number of Spindles' value. It must be set to ≥1. If 0 or blank, enter the quantity of spindles on your machine (typically 1 for single-spindle machines).

Do not exceed physical spindle hardware count or configured axis assignments.

Verify MD20051 through MD20059 contain valid spindle axis assignments (e.g., 'S' for main spindle). Each enabled spindle must reference a real axis defined in MD32000 (Axis List).

Execute 'Save & Reboot' from HMI System menu to write changes to NVRAM and restart NCK. Verify spindle availability on subsequent startup.

System will restart; ensure no active program is running.

Open HMI > Machine Data > Spindle section. Check MD20051 (1st Spindle Axis Name). It must contain a single letter (typically 'S') that matches an axis in the MD32000 Axis Configuration List.

Verify the axis name in MD32000 exists and is physically wired to a spindle drive (servo drive or frequency converter). Cross-reference with electrical drawings if available.

If using multiple spindles, confirm MD20052, MD20053 etc. are populated with unique axis names and MD20050 count matches the number of non-empty entries.

Save machine data and perform a cold restart (System > Power Off, then power on). Check Diagnostics > Alarms window for the alarm re-occurrence.

A cold restart (power cycle) is preferred over software reboot to ensure EEPROM flushing.

Access HMI System > Backup/Restore menu. Check the timestamp of the last machine data backup. If recent and suspect, restore a known-good backup from your archive.

Restoring will overwrite current settings; document current configuration first.

If no backup is available, manually re-enter spindle configuration: MD20050 (count), MD20051-MD20059 (axis names), and dependent parameters like MD20060 (Spindle Max Speed) and MD20070 (Spindle Type).

Use HMI Data Validation tool (if available) to syntax-check machine data before saving. Look for any warning messages in the Diagnostics log.

After configuration or restore, perform a cold power cycle and monitor NCK startup messages in the HMI Diagnostics window. Confirm alarm 104016 no longer appears.