Siemens Fault 0a7991

In pumping applications (vertical turbine pumps, centrifugal pumps), 0A7991 often points to or cavitation . The drive attempts to spin the impeller, but gas bubbles in the fluid compress rather than transfer torque. The motor sees no load (low torque, zero speed) – triggering the fault.

Based on common Siemens drive faults, you are likely looking for

Method 2: Manually Bypass and Inhibit the Identification Alarm

To confirm it's not a false trip, temporarily increase: siemens fault 0a7991

: Perform a "RAM to ROM" save to ensure the data is kept after the next power cycle. Manually Deactivate the Function

Understanding and Resolving Siemens Fault Code A07991 (Motor Data Identification Activated)

The is a common notification that appears on Siemens variable frequency drives (VFDs), most notably within the SINAMICS G120, G120C , and S120 drive series . Based on common Siemens drive faults, you are

If you are staging components inside a panel shop or lab environment without a physical motor load connected to the power modules, the drive will lock up or fault out if it tries to pass a diagnostic current.

Follow these steps to resolve the fault. Ensure all power is safely disconnected before checking physical connections.

Depending on whether you are actively on-site with a physical motor or testing a control panel before shipment, choose one of the following procedures: Method 1: Execute the Motor Identification Routine Follow these steps to resolve the fault

The motor commissioning was not completed properly, or the parameter set was not saved after the identification process (RAM to ROM).

: Motor overspeed, often caused by a faulty encoder or incorrect wiring. If you'd like, let me know: The specific Siemens drive model (e.g., S120, G120) If this happened during initial setup or during operation Any other fault codes currently appearing on the display