330-005B

Visual door inspection

Check all machine guard doors are fully closed and latched. Verify door alignment with safety switch actuators.

Never bypass safety doors - serious injury risk

Check door switch engagement

Manually verify each door safety switch clicks when door closes. Listen for audible engagement of magnetic or mechanical switches.

Slight door adjustment may be needed if switches barely engage

Verify SPLC door status

Access TNC Setup menu → Machine Parameters → Safety Parameters to view door input status. All door inputs should show 'CLOSED' state.

Use MOD function to monitor real-time door input states

Test switch continuity

Use multimeter to check continuity across door switch contacts with door closed. Should show closed circuit (0 ohms).

Power off machine before electrical testing

Inspect wiring harness

Check door switch wiring for damage, especially at flex points. Look for pinched, cut, or corroded conductors in cable chains.

Flex fatigue often occurs where cables enter moving door assemblies

Verify SPLC input signals

Access TNC Diagnosis → PLC → Inputs to monitor door switch input states in real-time while operating doors manually.

Document input bit addresses for future troubleshooting reference

Check safety parameter integrity

Access Setup → Safety Config → Door Configuration. Verify all door input assignments match physical wiring and are properly enabled.

Compare current config with machine documentation or backup files

Verify axis group safety settings

Navigate to Setup → Axis Configuration → Safety Settings. Confirm axis group safety dependencies include proper door interlocks.

Only qualified personnel should modify safety configurations

Perform safety system reset

Execute safety system restart via Setup → Safety → System Reset. This reinitializes SPLC communication and axis group states.

Safety reset may require acknowledgment at both TNC and external safety controller

Check active test procedures

Access Diagnosis → Axis → Test Status to identify any running brake tests or safety self-tests that require door closure.

Some tests run automatically at power-up or after E-stop reset

Clear pending test conditions

Navigate to Setup → Axis → Brake Test and cancel any pending or failed brake test procedures that may be holding door requirements active.

Ensure axes are properly secured before canceling brake tests

Restart safety test sequence

With all doors confirmed closed, initiate new safety self-test via Setup → Safety → Start Self-Test to clear alarm condition.

Monitor test progress in real-time to identify specific failure points