231-9470

Access machine parameters

Navigate to MOD function → Machine Parameters → Axis-specific parameters for the affected axis (%1).

Always backup current parameters before making changes

Check MotBrakeNotExist parameter

Locate parameter MotBrakeNotExist and verify the entry matches actual brake hardware installation (0=brake exists, 1=no brake).

Incorrect brake settings can cause axis runaway

Correct parameter value

Set MotBrakeNotExist to correct value based on physical brake presence and save parameters.

Cross-reference with electrical drawings to confirm brake wiring

Restart control

Perform complete TNC restart to activate new brake configuration parameters.

Verify brake hardware

Check servo drive and motor specifications to confirm brake presence and voltage requirements.

Verify power is off before inspecting brake connections

Check drive interface parameters

Access MOD → Machine Parameters → Drive Interface and verify brake output configuration matches hardware.

Document original settings before changes

Update brake configuration

Modify brake-related parameters to match actual hardware installation and brake voltage specifications.

Consult servo drive manual for correct brake parameter values

Test brake function

After restart, test brake engagement/release using TNC diagnostic functions in Test Run mode.

Backup current parameters

Create complete parameter backup via MOD → Data Management → Save machine parameters to external storage.

Include timestamp in backup filename

Reset axis parameters

Navigate to MOD → Machine Parameters → Reset axis parameters for affected axis to factory defaults.

This will erase all axis tuning parameters

Reconfigure brake settings

Manually re-enter correct brake configuration parameters based on machine documentation.

Use working axis parameters as reference if available

Perform axis calibration

Complete axis setup including reference point setting and brake function verification.

Check TNC software version

Access Help → Version Info to verify current TNC software version and build number.

Note exact version for technical support reference

Review parameter compatibility

Consult TNC documentation for brake parameter changes in current software version.

Check HEIDENHAIN technical bulletins for known issues

Update parameter format

Modify brake parameters to match current software version requirements if format has changed.

Ensure parameter changes are compatible with hardware

Consider software update

If persistent issues, evaluate TNC software update to resolve compatibility problems.

Check I/O module status

Navigate to Diagnosis → I/O Status and verify brake output module communication and status indicators.

Look for red status indicators or communication errors

Test brake output signal

Use TNC diagnostic functions to manually activate brake output and measure signal at I/O module.

Use proper safety procedures when testing brake outputs

Verify module connections

Check all connections between TNC, I/O module, and brake hardware for loose or damaged wiring.

Use multimeter to verify continuity and voltage levels

Replace faulty module

If module is confirmed faulty, replace I/O module and reconfigure brake output parameters.