Siemens SINUMERIK codes
Siemens SINUMERIKServo/AxisAdvanced45 - 120 minutes

25001

Siemens 25001 - Axis hardware fault of passive encoder

Axis hardware fault of passive encoder

Siemens SINUMERIK alarm 25001: Axis hardware fault of passive encoder. Detailed remedy is being verified against the current Siemens diagnostics manual.

Root Cause Summary

SIEMENS alarm 25001 Drive Configuration Error occurs when there is a mismatch between the drive parameters stored in the NCK and the actual drive configuration, or when drive-specific parameters in MD30xxx series are incorrectly set. This typically happens after drive replacement, parameter restoration, or when DRIVE-CLiQ topology changes are not properly synchronized with the control system.

Safety

  • Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.

Causes and Fixes

  1. 1

    Access Drive Diagnostics

    Navigate to Diagnostics > Drive > Overview and check drive status. Compare displayed drive type with MD30130 (drive type) setting.

    Use DRIVE-CLiQ topology display to verify physical drive matches configuration

  2. 2

    Perform Drive Detection

    Go to Commissioning > Drive > Automatic Drive Detection. Execute drive scan to update MD30xxx parameters automatically.

    Ensure all drives are properly connected before running detection

  3. 3

    Verify Critical Drive Parameters

    Check MD30130 (drive type), MD30131 (drive version), and MD30132 (drive configuration) match the installed hardware specifications.

    Cross-reference with drive nameplate data for exact model verification

  4. 4

    Reset and Restart NCK

    Perform NCK reset via HMI > Diagnostics > NCK > Reset, then restart system to apply new drive configuration.

    Save all program data before NCK reset

DIY Feasiblehigh confidence

Call a technician if:

  • ·Safety parameter signature corruption
  • ·Multiple drive configuration failures
  • ·Hardware replacement required

Prevention

  • Always perform drive detection after hardware changes
  • Maintain accurate backup files with hardware documentation
  • Verify DRIVE-CLiQ topology before parameter changes
  • Document motor and drive specifications in parameter comments

Common Mistakes

  • Restoring parameters without verifying hardware compatibility
  • Skipping drive detection after replacement
  • Ignoring DRIVE-CLiQ topology changes
  • Not clearing old parameters before reconfiguration

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