230-001A

Identify Changed Motor Parameters

Navigate to MOD > System Parameters > Axes > [Affected Axis] > Motor. Review parameters such as motorType, motorRatedCurrent, motorPolePairs, or motorTable entries. Compare against previous backup or documentation.

Press HELP key while cursor is on parameter to see detailed description and valid value ranges specific to your TNC version.

Verify Parameter Compatibility

Cross-reference the changed parameter values with the actual motor nameplate data. Ensure motor type codes match the installed motor (synchronous vs. asynchronous, frameless, etc.).

Incorrect motor parameters can cause thermal overload, reduced torque, or motor damage. Always verify against motor documentation.

Execute Controlled Power Cycle

Enter PLC STOP mode, engage Emergency Stop, turn OFF main cabinet power. Wait minimum 10 seconds for capacitor discharge. Power ON and allow complete boot sequence. The drive will initialize with new parameters.

Ensure no workpiece collision risk exists before referencing axes after parameter changes.

Perform Test Reference

After power-up, manually reference the affected axis in MDI mode. Monitor for smooth motion, proper reference point acquisition, and absence of current alarms or motor cogging.

Use MOD > Diagnosis > Axes > [Axis] > Position Monitor to observe actual vs. commanded position during initial moves.

Check Encoder Parameter Changes

Navigate to MOD > System Parameters > Axes > [Affected Axis] > Encoder. Review encoderType, refMarkType, encoderInterface (EnDat, 1Vpp, TTL), and resolution settings for recent modifications.

EnDat encoders require specific protocol initialization that only occurs during drive power-up sequence.

Verify Encoder Physical Connection

Before power cycling, verify encoder cable connections are secure and cable type matches the configured interface (shielded, proper impedance for 1Vpp, EnDat-capable cable, etc.).

Never disconnect or reconnect encoder cables with drive power ON. This can damage encoder electronics.

Power Cycle Drive System

Perform complete power cycle: PLC STOP → Emergency Stop → Main power OFF → Wait 10+ seconds → Power ON. Drive will reinitialize encoder interface with new configuration.

Watch for encoder-specific alarms during power-up (e.g., 41xxxx series). These indicate encoder initialization success or failure.

Verify Encoder Function

After power-up, check MOD > Diagnosis > Axes > [Axis] > Encoder Status. Verify reference marks are detected, no parity errors, and position values update correctly when manually rotating the axis.

Use the Position Display in Machine Coordinates to verify encoder counts match expected resolution during manual movement.

Identify Power Stage Parameter Changes

Check MOD > System Parameters > Axes > [Affected Axis] for changes to maxCurrent, peakCurrentTime, currentLoopGain, or enable signal configuration. Note previous vs. current values.

Increasing current limits beyond motor ratings can cause immediate thermal damage. Always stay within motor nameplate specifications.

Review Drive Configuration Logic

If enable signal configuration or drive mode parameters were changed, verify PLC program compatibility. Check that enable signals in PLC match new drive configuration requirements.

Use MOD > Diagnosis > PLC > Marker Display to monitor drive enable markers (e.g., M4xxx series) during startup.

Execute Power Cycle with Monitoring

Perform power cycle sequence. During power-up, monitor the Service Display or TNCdiag if available for drive initialization messages and current calibration routines completing successfully.

Modern TNC controls log drive initialization events. Check PLC error history after power-up for detailed drive startup status.

Test Under Load Conditions

After successful reference, test the axis with typical machining loads. Monitor current consumption in MOD > Diagnosis > Axes > [Axis] > Motor Current to verify new limits are appropriate and not causing premature current limiting.

Set up TraceScope function to capture motor current during test moves if repeated current limit alarms occur.