A07991 alarm in Siemens SINAMICS G120C Drive

A07991 Motor Data Identification Activated in the Siemens SINAMICS G120C Drive indicates that the motor data identification (Motor ID) routine has been enabled and will be performed the next time the drive receives a switch-on (Run) command.

A07991 alarm in Siemens SINAMICS G120C Drive


This is an alarm, not a fault. It is an informational message indicating that the drive is prepared to identify the motor parameters to optimize motor control and performance.

Possible Causes

  • Motor data identification has been activated.
  • Parameter p1900 has been configured to perform motor identification.
  • Initial drive commissioning is in progress.
  • Motor replacement requires a new identification routine.
  • Motor parameters have been changed and a new Motor ID is required.

Solutions

  1. No corrective action is normally required.
  2. Start the drive so the motor data identification routine can be completed.
  3. Wait until the Motor ID process finishes successfully.
  4. If Motor ID is not required, set Parameter p1900 = 0.
  5. Verify that the alarm disappears after the routine completes.

Additional Information

The Siemens SINAMICS G120C uses the Motor Data Identification (Motor ID) routine to automatically determine important motor characteristics. These values improve motor control accuracy, torque response, and overall drive performance.

Alarm A07991 simply informs the user that the Motor ID routine is pending and will execute on the next switch-on command.

According to Siemens:

  • The alarm disappears automatically after the motor data identification routine has been completed successfully.
  • The alarm also disappears if Parameter p1900 is set to 0, disabling the Motor ID routine.

Unlike a fault, A07991 does not indicate a malfunction and normally does not require troubleshooting.

Common Symptoms

  • Drive displays A07991 Motor Data Identification Activated.
  • Drive is ready for Motor ID.
  • Alarm appears during commissioning.
  • Motor identification starts after the next Run command.
  • Alarm clears automatically after successful Motor ID.
  • No hardware problem is present.
  • Normal drive operation resumes after the identification process.

Recommended Troubleshooting Sequence

  1. Verify that the displayed message is A07991.
  2. Confirm that Motor Data Identification is intended.
  3. Check Parameter p1900.
  4. Start the drive to perform the Motor ID routine.
  5. Allow the identification process to complete without interruption.
  6. Verify that the alarm clears automatically.
  7. If Motor ID is not required, set p1900 = 0.
  8. Confirm normal drive operation after the alarm disappears.

A07991 Motor Data Identification Check Table

Check PointAction
Parameter p1900Verify Motor Data Identification setting
CommissioningConfirm Motor ID is required
Run commandStart the drive to begin identification
Motor ID routineAllow it to complete successfully
Alarm statusVerify it clears automatically
Drive operationConfirm normal operation after completion

Preventive Maintenance Tips

  • Perform Motor Data Identification during initial commissioning.
  • Enter correct motor nameplate data before running Motor ID.
  • Do not interrupt the identification process once it has started.
  • Repeat Motor ID whenever the motor is replaced or significant motor parameters change.
  • Back up drive parameters after successful commissioning.
  • Verify p1900 before enabling Motor ID.
  • Record commissioning settings for future maintenance.
  • Follow Siemens commissioning procedures for the SINAMICS G120C drive.
  • Ensure the motor is correctly connected before starting the identification routine.
  • Maintain a stable power supply during Motor ID.

Proper configuration of Parameter p1900 and successful completion of the Motor Data Identification routine will ensure accurate motor parameters, improved control performance, and reliable operation of the Siemens SINAMICS G120C drive. The A07991 alarm is informational and normally clears automatically after the Motor ID routine finishes successfully or when p1900 is set to 0.

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