231-C480

Access motor configuration table

Navigate to Setup → Machine Parameters → Axes/Spindles → Motor Table and locate the affected motor entry.

Document current settings before making changes for rollback purposes

Check STR parameter value

Verify the STR parameter shows 0 (V/Hz mode). This should typically be 1 for servo control or 2 for vector control with encoder feedback.

Changing control modes requires understanding of motor and drive characteristics

Correct STR parameter setting

Change STR parameter to appropriate value: 1 for standard servo control or 2 for vector control, matching your encoder configuration.

Consult drive documentation to determine optimal control mode for your specific motor/encoder combination

Validate configuration and restart

Save parameters, perform PLC restart, and verify alarm clears during system initialization.

Review encoder system requirements

Determine if the motor actually requires encoder feedback or if it should operate in open-loop V/Hz mode.

Removing encoder feedback affects positioning accuracy and may impact machining quality

Access SYS parameter in motor table

Navigate to the SYS parameter for the affected motor and note the current encoder type setting (1=incremental, 2=absolute, etc.).

Cross-reference with physical encoder connections and cable routing

Set SYS parameter to match control mode

If true V/Hz control is required, set SYS = 0 (no encoder). If encoder feedback is needed, change STR parameter instead.

V/Hz mode is typically only used for spindle motors, not servo axes

Verify motor table consistency

Ensure all related parameters (feedback resolution, scaling factors) align with the new SYS setting before saving.

Review motor table history

Check if recent motor table entries were copied or imported from backup files with different motor configurations.

Use parameter comparison tools to identify inconsistencies across similar motor entries

Verify physical motor and encoder setup

Confirm actual hardware configuration matches intended motor table settings by checking motor nameplate and encoder connections.

Mismatched parameters can cause unexpected motor behavior or damage

Rebuild motor table entry from scratch

Delete problematic entry and recreate using motor-specific parameters rather than copying from existing entries.

Use HEIDENHAIN motor database templates when available for your specific motor model

Test motor operation in controlled manner

Perform low-speed test movements to verify proper motor response before full operation.

Backup current parameter set

Create complete parameter backup via Setup → Data Management → Backup Parameters before troubleshooting.

Always backup parameters before making systematic changes

Compare with known good configuration

Load previous working parameter backup or compare with identical machine configurations to identify discrepancies.

Use parameter comparison utilities to highlight differences systematically

Restore or manually correct parameters

Either restore from backup or manually correct STR and SYS parameters to match working configuration.

Document all changes for future reference and troubleshooting

Perform full system validation

Execute complete parameter validation check and test all motor functions to ensure proper operation.