230-0006

Access Spindle Parameters

Navigate to MOD → Machine Parameters → Spindle Parameters and locate parameters 3501 (signCorrNominalVal) and 3502 (signCorrActualVal).

Use parameter search function (CTRL+F) to quickly locate spindle direction parameters.

Verify Parameter Values

Check that both signCorrNominalVal and signCorrActualVal have consistent values (both +1 or both -1) for the affected spindle axis.

Document original parameter values before making changes.

Test Spindle Rotation

Execute M3 and M4 commands in MDI mode to verify actual spindle rotation matches the commanded direction.

Use low RPM (100-200) for initial testing to observe rotation direction safely.

Adjust Parameters if Needed

If rotation is incorrect, change signCorrNominalVal to match actual spindle behavior and reset the alarm.

Spindle must be stopped before changing direction parameters.

Check Encoder Parameters

Verify encoder parameters 4010-4019 for correct encoder type and signal evaluation settings in the spindle axis configuration.

Compare encoder parameters with machine documentation to ensure correct setup.

Monitor Encoder Signals

Use TNC diagnostic screen (DIAG → Encoder) to observe encoder signal direction during manual spindle rotation.

Ensure spindle is in safe position before manual rotation testing.

Verify Wiring Connections

Check encoder cable connections at both encoder and TNC terminals, particularly A+ A- B+ B- signal wires for proper phase relationship.

Swapping A and B encoder signals will reverse the direction feedback.

Test Direction Correction

If wiring is correct but direction is wrong, toggle the encoder direction parameter or adjust signCorrActualVal accordingly.

Changes to encoder direction affect all spindle operations - test thoroughly.

Review Recent Parameter Changes

Check parameter modification log in MOD → Service → Parameter Log to identify recent changes to spindle-related parameters.

Look for changes to parameters 3500-3520 range which affect spindle direction evaluation.

Verify Drive Direction Setup

Access drive parameters through the drive interface and confirm M3/M4 direction commands produce correct rotation.

Drive parameter changes may require drive power cycle to take effect.

Check Motor Phase Sequence

Verify motor phase connections (U, V, W) are correct - incorrect phasing will reverse rotation direction.

Swapping any two motor phases will reverse direction - this is often easier than parameter changes.

Synchronize TNC Parameters

Update signCorrNominalVal to match the actual drive configuration and clear the alarm.

Ensure all spindle operations are tested after parameter changes.

Check Software Version

Verify current TNC software version in MOD → Service → Version Info and compare with previous version documentation.

Software release notes often detail parameter evaluation changes.

Review Parameter Migration Log

Check for parameter migration messages in the system log that indicate automatic parameter value changes.

Parameter migrations cannot be undone - verify new values are correct.

Validate New Parameter Logic

Test spindle operation with the automatically corrected signCorrActualVal value to ensure proper function.

New software may have improved direction detection - trust the automatic correction if spindle works correctly.

Update Machine Documentation

Document the new parameter values and update machine setup sheets to reflect the corrected configuration.

Inform operators of any changes in spindle behavior or setup procedures.