330-0042

Check Brake Status in TNC Diagnostics

Navigate to MOD 9906 (Service) -> Diagnosis -> Drive diagnosis and verify brake engagement status for the affected axis.

Ensure machine is in safe state before brake testing

Perform Manual Brake Test

Use TNC function MOD 9906 -> Test -> Brake test to verify holding brake functionality. Monitor position deviation during test.

Compare brake holding torque against axis specifications in machine documentation

Inspect Brake Hardware

Check brake coil resistance, air gap, and mechanical wear. Verify 24V brake supply voltage at drive amplifier terminals.

Lock out main power before electrical measurements

Adjust Brake Parameters

If brake is functional, verify CfgDrive->brakeEngageTime and CfgDrive->brakeReleaseTime parameters match brake specifications.

Access Safety Configuration

Navigate to MOD 9906 -> Configuration -> Safety -> Axis Safety and locate CfgAxisSafety->positionRangeVmin for the affected axis.

Document current value before making changes

Analyze Position Deviation History

Use TNC Scope function to monitor actual position deviations during normal stop sequences to determine appropriate tolerance.

Only qualified safety personnel should modify safety parameters

Calculate Appropriate Tolerance

Set positionRangeVmin to 150-200% of maximum observed settling deviation, considering mechanical backlash and thermal effects.

Validate Safety Function

Perform complete safety validation including SOS and SS2 testing after parameter modification to ensure compliance.

Check Axis Movement Quality

Use TNC manual mode (MOD 1) to jog axis at low feed rates, monitoring for binding, irregular motion, or excessive current draw in drive diagnostics.

Ensure all safety systems are functional before manual movement

Inspect Mechanical Components

Check ballscrew, linear guides, and coupling connections for wear, contamination, or damage. Verify proper lubrication levels.

Analyze Following Error

Monitor CfgAxis->maxFollowingError and actual following error in drive diagnostics during controlled movements to identify mechanical resistance.

Perform Backlash Compensation Check

Verify CfgComp->backlashCompensation settings are appropriate for current mechanical condition of the axis.

Check Drive Status LEDs

Inspect drive amplifier status indicators and verify no fault conditions exist. Check for proper 24V control voltage supply.

Verify Drive Parameters

Access MOD 9906 -> Configuration -> Drive and confirm CfgDrive->maxDeceleration and emergency stop parameters are correctly configured.

Test Drive Response

Use drive diagnostics to monitor actual vs. commanded deceleration rates during controlled stop sequences.

Compare current drive performance against commissioning baseline values

Check Power Supply Quality

Verify DC bus voltage stability and absence of power supply ripple that could affect drive control precision.

Check Encoder Diagnostics

Navigate to MOD 9906 -> Diagnosis -> Encoder diagnosis and verify signal quality, track errors, and interpolation warnings for the affected axis.

Inspect Encoder Connections

Check encoder cable integrity, connector pins, and shielding continuity. Verify proper cable routing away from power conductors.

Use anti-static precautions when handling encoder connections

Verify Reference Point

Perform reference point approach (MOD 6) and confirm repeatable positioning to validate encoder zero pulse functionality.

Test Position Accuracy

Use precision measurement tools to verify actual axis position matches TNC display during standstill conditions.