After identification is complete or parameters are changed, save the settings by performing a copy (set P0971 = 1 ). This ensures the alarm does not return after a power cycle. Common Troubleshooting Scenarios
: It often appears during initial commissioning or after a power cycle if the ID run was never successfully completed and saved to the permanent memory (ROM). Resolution Steps
Once the motor data identification routine is successfully completed, the A7991 alarm disappears on its own. siemens fault 0a7991
The Siemens alarm indicates that Motor Data Identification (ID) is currently active or scheduled to run at the next power-on command. This is a standard part of the commissioning process for Siemens SINAMICS drives (such as the G120 or G130) where the inverter measures the connected motor's characteristics to optimize control performance. Core Cause
One common alarm seen during commissioning or after power cycling is , often accompanied by the message "Drive: Motor data identification activated" . This article provides a comprehensive guide to understanding, fixing, and preventing this alarm. What is Siemens Fault/Alarm A07991? After identification is complete or parameters are changed,
Alarm A07991 indicates that the drive is waiting to perform or is currently performing a motor data identification run (also known as a "tuning" or "ID run").
Alarm A07991 appears in the same manner across all these platforms, though specific parameters may vary slightly by model. Resolution Steps Once the motor data identification routine
How can resolve the alarm Code 7991 and 8526 - SiePortal - Siemens
| Product Series | Model Examples | Applicable Manual Reference | |:---|:---|:---| | | G120, G120C, G120X, G120XA | Siemens G120 manual (A07991) | | SINAMICS V90 | V90 Servo Drive | SINAMICS V90 Operating Instructions | | SINAMICS S120 | S120 Servo Drive | SINAMICS S120 Commissioning Manual | | Other SINAMICS | G110M, G120P, G115D | Various SINAMICS documentation |
Disclaimer: Always follow safety procedures when working with electrical equipment. Parameter changes should be made by qualified personnel. If you'd like, I can:
Users often see together with A8526 ("Drive: PLC signal not valid"). This typically means the PROFIdrive telegram from the PLC is not sending the correct status word, or the motor ID run failed, causing the PLC to stop sending commands. Solution for A8526/A07991 Combo: Address A07991 by performing the ID run.