Siemens Fault 0a7991 Best !full! Jun 2026

The is actually a status notification, not a hardware error, indicating that Motor Data Identification is activated . This means the drive is waiting for a "Start" command to perform an automated tuning routine to measure the motor's electrical characteristics. Quick Fixes

In many cases, after the identification is complete or disabled, you must perform a copy (save parameters to non-volatile memory) to ensure the alarm does not return after a power cycle. Common Troubleshooting Scenarios siemens fault 0a7991 best