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Access the drive commissioning screen and navigate to the affected axis machine data settings (MD117).

Check the motor nameplate or motor documentation for the rotor moment of inertia value (typically specified in kgcm² or gcm²).

Enter the correct motor inertia value into MD117. Add mechanical load inertia if required by system configuration (consult machine manufacturer documentation).

Incorrect inertia values can cause unstable axis behavior, oscillation, or following errors

Perform a power cycle (Power Off) and restart the control system to reinitialize the axis with the new parameter.

Check the NCK alarm buffer for additional alarms indicating battery failure (210000 series) or parameter errors that occurred before this alarm.

Verify the system battery voltage and replace if necessary (below 3.0V DC indicates replacement needed).

System must remain powered during battery replacement to prevent complete data loss

Restore machine data from a known good backup archive (INI files) if available, focusing on drive and axis parameters for the affected axis.

If no backup exists, manually re-enter all critical axis machine data parameters using commissioning documentation or contact machine builder for parameter set.

Verify that the installed motor matches the machine documentation and that MD117 corresponds to the actual motor model installed.

Obtain the correct motor inertia value from the Siemens motor catalog or motor technical data sheet for the specific motor model (1FK7, 1FT6, 1PH8, etc.).

Enter the correct motor inertia value into MD117 and verify related parameters such as MD118 (LOAD_INERTIA) and MD119 (TOTAL_INERTIA_CALC).

Run automatic drive optimization (if available) or manually verify controller gains (MD130-MD139) are appropriate for the new inertia ratio.

Test axis movement at reduced feedrates initially to verify stable operation