330-00BA

Check Drive Status Display

Navigate to MOD > DIAGNOSIS > DRIVE and check the status of the affected axis drive for fault codes or readiness indicators.

Look specifically for RDY signal status and any internal drive faults that prevent proper power stage operation.

Verify Drive Power Supply

Check DC bus voltage and motor power supply connections to the drive inverter. Measure voltage levels at the drive terminals.

Ensure proper lockout/tagout procedures before checking electrical connections.

Reset Drive and Monitor

Power cycle the drive inverter and monitor the RDY.x signal transition during startup sequence using the TNC diagnostic display.

Document the exact timing of when the RDY signal fails to prevent troubleshooting loops.

Check Drive Parameters

Verify drive-specific safety parameters and STO configuration settings in the drive's internal parameter set.

Compare current parameters with backup or commissioning documentation to identify any changes.

Inspect STO Wiring Connections

Check all STO circuit connections between TNC safety outputs and drive STO inputs, looking for loose, corroded, or damaged connections.

De-energize safety circuits before inspection to prevent accidental activation.

Measure STO Signal Continuity

Use multimeter to verify continuity and proper voltage levels on STO.A.x and STO.A.P.x signal paths from control to drive.

Check both channels of the dual-channel STO circuit as both must function correctly for proper operation.

Verify Safety Relay Operation

Test safety relay contacts in the STO circuit using the TNC safety diagnostic functions in MOD > DIAGNOSIS > SAFETY.

Manually cycle the safety relays while monitoring contact states to identify intermittent failures.

Check Cable Shield Integrity

Inspect STO signal cable shielding and grounding connections for proper EMI protection and signal integrity.

Poor shielding can cause signal noise that triggers false STO fault conditions.

Access Safety Parameter Settings

Navigate to MOD > MACHINE PARAMETERS and review safety-related parameters for STO configuration, particularly those related to axis-specific safety monitoring.

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

Perform Safety System Self-Test

Execute the TNC built-in safety system diagnostic test through MOD > DIAGNOSIS > SAFETY > SELF TEST to identify internal safety module issues.

Safety self-tests will disable machine operation during execution.

Check Safety Module Status LEDs

Inspect the physical safety module LEDs on the TNC control for fault indicators and compare with the diagnostic display information.

LED patterns often provide more detailed fault information than the alarm text alone.

Verify Safety Software Version

Check the safety software version compatibility with the drive system using MOD > DIAGNOSIS > VERSION display.

Mismatched safety software versions can cause communication protocol issues with STO monitoring.

Check DRIVE-CLiQ Network Status

Navigate to MOD > DIAGNOSIS > DRIVE-CLiQ and verify network topology and communication status for all connected drives.

Look for intermittent communication errors that may not trigger separate DRIVE-CLiQ alarms.

Inspect DRIVE-CLiQ Cables

Physically inspect all DRIVE-CLiQ cables for damage, proper seating, and correct routing away from interference sources.

Handle DRIVE-CLiQ connectors carefully as they contain precision contacts that can be easily damaged.

Verify Network Configuration

Check DRIVE-CLiQ network configuration parameters and compare with the actual physical network topology to identify mismatches.

Use the automatic network detection feature to verify the configured topology matches the physical setup.

Test Communication Quality

Run DRIVE-CLiQ communication quality tests to identify marginal connections that may cause intermittent STO signal failures.

Poor communication quality often manifests as safety signal errors before causing complete communication failure.