This is the primary, intended way to handle A07991. Completing the motor data identification (ID) routine is the best practice for ensuring optimal drive performance.
: Verify parameter p1900 is set to 2 (Identify motor data at standstill) via your keypad (BOP-2/IOP-2) or engineering software.
for detailed steps on resolving motor stalling (F7902) through static optimization. siemens fault 0a7991 best
Enable the drive and give a start command. The motor will run, and the alarm should disappear upon success. 2. Complete Configuration and Run Motor ID at Standstill
There are two primary ways to clear this alarm. The first is the standard procedure; the second is for experienced users in specific scenarios. This is the primary, intended way to handle A07991
To conclude, seeing "Siemens fault 0A7991" on your screen is rarely a cause for panic. It is a deliberate and useful feature that safeguards your equipment. The following table summarizes your best options:
The load is physically stuck, jammed, or oversized for the motor. for detailed steps on resolving motor stalling (F7902)
When configuring a Siemens SINAMICS VFD drive for an induction or synchronous motor, the inverter needs an accurate mathematical model of the load it is controlling. This model guarantees optimal torque control, high efficiency, and precise overcurrent protection.
The motor nameplate data entered into the drive does not align with the physical motor connected.
October 2023 Product Scope: SINAMICS G120, G120C, G120D, S120 (CU2xx-2 series) Keyword Focus: siemens fault 0a7991 best