Go to the commissioning folder and set parameter p1900 to 2 (Motor data identification at standstill) or 1 (Motor data identification with rotation).
While the exact wording may vary slightly depending on the CPU family (S7-300, S7-400, S7-1200, S7-1500), the fault typically translates to:
: Check p1910 and ensure it is set to 0 to halt active standstill measurements. 3. Perform a RAM-to-ROM Copy
Once the identification run is successfully completed, the alarm should disappear automatically, and the drive transitions into its normal operating state. Siemens SiePortal Troubleshooting and Resolution Strategies siemens fault 0a7991
Follow these steps to resolve the fault. Ensure all power is safely disconnected before checking physical connections.
Are you currently performing an , or did this alarm appear suddenly on a drive that was already running ? How can resolve the alarm Code 7991 and 8526 - SiePortal
. This is typically not a critical failure but a mandatory safety and performance state where the drive waits for a measurement routine to calibrate itself to the connected motor. Siemens SiePortal Primary Cause and Function Go to the commissioning folder and set parameter
Removes the requirement for motor details for initial testing.
A: Do not keep resetting. Check for a short on the motor cable (phase-to-phase or ground). Use a megohmmeter.
Users reporting the Siemens fault code 0A7991 have described the following symptoms and effects: Perform a RAM-to-ROM Copy Once the identification run
To resolve the Siemens fault code 0A7991, users can try the following:
As with any complex fault, prevention is better than a panic-driven reset.
If the system is safely mechanical-ready, complete the routine to clear the code automatically.
: This is an alarm, not a fault. It indicates that the drive is currently performing a "Motor Data Identification" (motor ID run) to measure the motor's electrical characteristics.
Common root causes: