1A0-0177

Verify M19 in NC Program

Review the NC program and confirm M19 (spindle orientation) is programmed before any facing slide axis movement commands. Check that no M3/M4/M5 commands cancel the orientation before facing slide motion.

On multi-spindle machines, ensure you're using the correct M19 variant (M19.1, M19.2, etc.) for the specific spindle associated with the facing slide.

Test Spindle Orientation Manually

In Manual Operation mode, execute M19 from the MDI and observe if the spindle orients to the correct position. Watch for timeout errors or positioning failures in the status display.

Ensure no tool or workpiece collision can occur during manual spindle orientation testing.

Check Spindle In-Position Signal

Go to MOD > Diagnosis > PLC to view PLC inputs/markers. Locate the spindle orientation complete signal (machine-specific, typically an input from the spindle drive) and verify it activates when M19 completes.

The signal name varies by machine builder - look for keywords like 'SPINDL_ORI_OK', 'M19_COMPL', or consult machine electrical documentation.

Review Machine Parameter MP4510

Check MP4510 (timeout for spindle orientation). If set too low, M19 may timeout before the spindle reaches position. Typical values are 5-10 seconds. Increase if mechanical orientation is slow.

After changing MP4510, cycle power to the control or execute a PLC restart for the change to take effect.

Check Spindle Position Display

Navigate to MOD > Diagnosis > Position and observe the spindle angular position (C-axis or spindle position display). Manually rotate the spindle and verify the position updates smoothly without jumps or freezing.

Disable spindle drive before manual rotation to prevent unexpected motor movement.

Inspect Encoder Cable and Connections

Check the spindle encoder cable connection at both the encoder and the TNC control/drive interface. Look for loose connections, damaged shielding, or cable routing near high-voltage/interference sources.

Encoder issues often show intermittent behavior - wiggle the cable connections while monitoring position display to reveal intermittent faults.

Review Encoder Error History

Check MOD > Diagnosis > Error Log for previous encoder-related alarms (typically 4xx series alarms for position encoder errors). Historical encoder faults indicate hardware issues even if currently no alarm is active.

Use the TNCdiag software (if available) to log encoder signals in real-time for detailed analysis.

Verify MP4xxx Encoder Parameters

Review spindle encoder configuration in machine parameters MP4200-MP4299 series. Confirm encoder type, lines per revolution, and monitoring settings match the actual installed encoder specifications.

Compare parameter settings with machine commissioning documentation - incorrect encoder configuration after a battery change or parameter reset is common.

Identify Alignment Tolerance Parameter

Search machine parameters (often in MP1xxx for axis-specific or MP7xxx for spindle-specific) for facing slide or spindle alignment tolerance. Parameter names vary by machine builder - look for keywords like 'FACING_SLIDE_TOL', 'ALIGNMENT_WINDOW', or consult machine parameter documentation.

If parameter documentation is unavailable, contact the machine tool builder - alignment parameters are typically proprietary to their integration.

Check Current Alignment Deviation

If available in MOD > Diagnosis > PLC or custom diagnostic screens, check the actual measured deviation between spindle position and required alignment position when alarm occurs. This shows if you're close to tolerance.

Some machine builders provide custom diagnostic pages accessible via PLC softkeys showing real-time alignment deviation values.