Siemens Fault 0a7991 __full__

Here’s a technical support-style post regarding Siemens fault 0A7991 (often written as 0a7991 or A07991 depending on the drive family).

. This means the drive is waiting to measure the electrical characteristics of the connected motor to optimize its control performance. The Meaning of Alarm A07991 siemens fault 0a7991

The motor may emit a whistling sound for several seconds as it carries out measurements at a standstill . p1900 = 1 (Stationary ID, calculates stator resistance,

• p1900 = 1 (Stationary ID, calculates stator resistance, leakage inductance).
• p1900 = 2 (Rotating ID, calculates magnetizing curve and inertia).