Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 101168

Siemens 840D 101168 - Warning MDx142 FIELD_WEAKENING_SPEED<MDx400

This warning indicates that the field weakening speed setting (MD x142 FIELD_WEAKENING_SPEED) is configured to a lower value than the maximum machine speed (MD x400 MAX_AXIS_VELOCITY). This mismatch means the drive cannot reach the commanded maximum speed because field weakening would be required at speeds above MD x142, but the motor is being asked to operate beyond its field weakening range.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

101168

Siemens 840D 101168 - Warning MDx142 FIELD_WEAKENING_SPEED<MDx400

Warning MDx142 FIELD_WEAKENING_SPEED<MDx400

Siemens SINUMERIK operator message 101168: Warning MDx142 FIELD_WEAKENING_SPEED<MDx400. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.

Root Cause Summary

This warning indicates that the field weakening speed setting (MD x142 FIELD_WEAKENING_SPEED) is configured to a lower value than the maximum machine speed (MD x400 MAX_AXIS_VELOCITY). This mismatch means the drive cannot reach the commanded maximum speed because field weakening would be required at speeds above MD x142, but the motor is being asked to operate beyond its field weakening range.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Causes and Fixes

  1. 1

    Access drive machine data and compare MD x142 (FIELD_WEAKENING_SPEED) with MD x400 (MAX_AXIS_VELOCITY) for the affected axis.

  2. 2

    Review motor nameplate data and verify the rated speed and maximum speed specifications to determine correct field weakening threshold.

  3. 3

    If application requires speeds above base motor speed, increase MD x142 to match or exceed MD x400, or enable and properly configure field weakening parameters (MD x144, MD x145).

    Ensure motor and drive are rated for field weakening operation before enabling this feature.

  4. 4

    If field weakening is not required, reduce MD x400 to a value at or below MD x142 to match actual machine speed requirements.

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