Siemens Fault 0a7991 Jun 2026

Running a basic setup script through software like Startdrive or Starter automatically schedules a motor identification run.

If you've activated the Motor ID routine by mistake or need to bypass it for urgent testing (while understanding that drive performance may be suboptimal), you can disable it. siemens fault 0a7991

If you need more specific help with this drive setup, tell me the of your inverter (such as a Sinamics G120 or S120 ), whether the motor is allowed to spin during testing, or if you are configuring it via TIA Portal . Share public link Running a basic setup script through software like

: If you see both, there is likely a communication issue with the PLC. If no PLC is connected, set P2030 = 0 (No protocol) and perform a RAM to ROM save before restarting. Share public link : If you see both,

When a Siemens SINAMICS VFD displays A07991 , it means parameter (Motor data identification selection) or p1910 has been altered from its idle state ( 0 ). This triggers the inverter to lock normal operations until it can verify the physical characteristics of the motor.