330-0036

Check Axis Status

Access the control panel on the Heidenhain system and navigate to the axis status screen to confirm if the affected axis shows 'not referenced'.

Take a screenshot or note the exact status message for documentation.

Ensure the machine is in a safe state before accessing the control panel.

Initiate Manual Homing

Follow the machine's standard operating procedure to manually initiate the homing sequence for the affected axis. Refer to the Heidenhain user manual for specific key sequences or menu options.

Ensure no obstructions are in the axis path before starting the homing process.

Keep clear of moving parts during homing to avoid injury.

Verify Homing Completion

After the homing sequence, check the axis status again to confirm it now shows as 'referenced'. If the alarm persists, proceed to other potential causes.

Log the successful homing time and date for future reference.

Do not operate the machine if the axis remains unreferenced.

Check Error Logs

Access the diagnostic menu on the Heidenhain control panel and review the error logs for any software-related errors or warnings that coincide with the alarm.

Look for recurring error codes that might indicate a deeper software issue.

Do not attempt to modify software settings without proper training.

Restart Control System

Power down the machine completely, wait for 5 minutes, then restart the system to clear any temporary software glitches. Monitor if the alarm reappears after restart.

Ensure all data is saved before restarting to avoid loss of settings.

Follow proper shutdown procedures to prevent data corruption.

Update or Reinstall Software

If the issue persists, check for available software updates from Heidenhain or consider reinstalling the control software as per the service manual instructions.

Always back up current settings before updating or reinstalling software.

This step should only be performed by a qualified technician if unfamiliar with the process.

Locate Reference Switch

Refer to the machine's technical documentation to locate the reference switch or sensor for the affected axis.

Mark the switch location for easier access during future maintenance.

Ensure the machine is powered off and locked out before accessing hardware.

Test Switch Functionality

Use a multimeter to test the continuity or signal output of the reference switch when manually triggered. Compare results against the expected values in the manual.

Clean the switch contacts with electrical contact cleaner if dirty before testing.

Wear appropriate PPE when working with electrical components.

Replace Faulty Switch

If the switch or sensor is defective, replace it with a compatible part as specified by Heidenhain. Retest the homing procedure after replacement.

Keep a spare reference switch in inventory for quick replacement.

Ensure proper alignment during installation to avoid further issues.

Inspect Axis Path

Visually inspect the travel path of the affected axis for any debris, tools, or obstructions that might prevent movement to the home position.

Use a flashlight for better visibility in tight spaces.

Power off the machine and lock out energy sources before inspection.

Check for Binding

Manually move the axis (if safe and permitted by the system) to check for unusual resistance or binding. Listen for unusual noises that might indicate mechanical issues.

Lubricate guide rails if binding is due to lack of lubrication, following manufacturer specs.

Do not force movement if significant resistance is encountered.

Clear Obstructions and Retest

Remove any identified obstructions or address binding issues, then reattempt the homing procedure to see if the alarm clears.

Document the type of obstruction for preventive maintenance planning.

Ensure all personnel are clear of the machine before retesting.

Access Parameter Menu

Using the Heidenhain control panel, access the machine parameter menu (often requires a service code or password) to review settings related to axis referencing.

Document current settings before making any changes for rollback if needed.

Incorrect parameter changes can cause further issues; proceed with caution.

Compare with Baseline

Compare the current parameter values with the factory or last known good configuration as per the machine documentation or service records.

Contact Heidenhain support if baseline values are unavailable.

Do not guess parameter values; use documented references only.

Correct and Test Parameters

If discrepancies are found, update the parameters to the correct values, save changes, and restart the system. Retest the homing procedure to confirm resolution.

Perform a full system backup after successful parameter correction.

Only qualified personnel should modify parameters.