231-A200

Check Drive Status in MOD 127

Access MOD 127 (Machine Parameters) and navigate to servo drive diagnostics. Verify RDY signal status for the affected axis.

Look for bit patterns in the drive status word - RDY is typically bit 0

Verify Inverter Enable Signal

Check parameter MP7300.x (Drive Enable) for the specific axis. Ensure the inverter enabling signal is active and not blocked by safety circuits.

Never bypass safety circuits - investigate why the enable signal is missing

Inspect Drive Hardware

Check physical connections to the servo drive, verify 24V supply to enable circuits, and examine drive LED status indicators for fault conditions.

Reset Drive System

Perform controlled drive reset via MOD 127 servo diagnostics menu. Monitor for proper RDY signal establishment during startup sequence.

Check Door Status in PLC Diagnostics

Access MOD 127 and navigate to PLC I/O diagnostics. Verify all safety door inputs show closed status (typically active high or low depending on configuration).

Document door input states before troubleshooting - intermittent door switches are common

Verify Safety Parameter Settings

Check MP7500.x series parameters for safety door requirements during brake testing. Verify if door monitoring is enabled for brake test operations.

Modifying safety parameters requires proper authorization and safety assessment

Test Door Switch Operation

Manually operate each protective door while monitoring I/O status in real-time diagnostics. Verify proper switch actuation and signal transmission to TNC.

Reset Safety System

After confirming all doors are properly closed, reset the safety system via the designated safety reset button or MOD function.

Verify Brake Assignment Parameters

Access MOD 127 and check MP7200.x series parameters for brake assignment. Verify the brake output is correctly mapped to the intended servo axis.

Cross-reference brake assignments with electrical schematics to ensure proper configuration

Check Brake Control Parameters

Examine MP7210.x parameters for brake control timing and activation settings. Ensure brake delay and hold times are properly configured for the specific drive.

Validate I/O Mapping

Verify brake control outputs in the I/O assignment table (typically in MP6xxx series). Confirm physical output addresses match parameter settings.

Test Brake Assignment

Use manual brake control function in MOD 127 servo diagnostics to verify proper brake operation before attempting automatic brake test.

Verify Operating Mode

Ensure TNC is in Manual or MDI mode. Brake tests typically cannot be executed during automatic program operation or in certain restricted modes.

Check Emergency Stop Status

Verify emergency stop circuits are not active. Check both hardware E-stop buttons and software emergency conditions in system diagnostics.

Clear Active Alarms

Review and clear any pending alarms that might prevent brake test execution. Some alarms block safety-related functions until resolved.

Only clear alarms after understanding and addressing their root cause