Siemens Fault 0a7991 Best -

Siemens Fault A07991

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

Siemens Fault 0A7991 — Best Practices Guide

Quick Reference Card (Print this):

| Symptom | Solution | | :--- | :--- | | Fault 0A7991 appears | Check p0840 (ON/OFF1) = 1 | | Fault occurs during p1910 | Ensure no active OFF2/STO | | Fault occurs after reset | Perform p0970 factory reset | | Fault remains after all checks | Measure 24V DC on control terminals | siemens fault 0a7991 best

What is Fault 0A7991?

Disclaimer: This guide applies to SINAMICS firmware versions 4.6 and above. Always refer to the official Siemens List Manual (LH1) for your specific drive unit. Siemens Fault A07991 The is actually a status

p1900 = 0

If you cannot perform the motor ID run (e.g., during a Factory Acceptance Test without the final motor connected), set parameter (Inhibited). Disclaimer: This guide applies to SINAMICS firmware versions