Siemens Fault 0a7991 Access

: Triggered when a user alters parameter p1900 or p1910 to initialize measurement.

This notification can be triggered in several typical scenarios:

: If the alarm returns even after you thought it was finished, it likely wasn't saved to permanent memory. Ensure you perform the RAM to ROM save procedure . How can resolve the alarm Code 7991 and 8526 - SiePortal

To troubleshoot and resolve fault code 0A7991, follow these steps: siemens fault 0a7991

If you are commissioning a new drive and the motor is physically connected, the best practice is to let the drive optimize itself.

Users reporting the Siemens fault code 0A7991 have described the following symptoms and effects:

Set parameter to de-activate the identification routine . : Triggered when a user alters parameter p1900

The alarm commonly appears during three distinct lifecycle stages:

Perform a "Motor Identification at Standstill" (p1910). This allows the drive to measure the electrical characteristics of the motor.

: If a drive restarts while waiting for a measurement command, the request can get stuck or reset, keeping the alarm flagged on subsequent boot-ups. How can resolve the alarm Code 7991 and

The notification triggers whenever the of the motor's electrical characteristics (such as stator resistance and leakage inductance). This calibration is essential for high-performance control modes, safety protections, and energy-efficient motor management.

This alarm frequently appears alongside , which indicates a communication timeout with a PLC.

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

The most stable long-term fix is letting the drive perform its automated measurement.