: Once measurements conclude, the drive automatically sets p1900 = 0 , and the A07991 alarm code instantly clears.
This is often an Alarm (A) rather than a Fault (F), meaning it’s a warning that the drive is waiting for specific motor identification data, or that a measurement routine is underway.
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The key distinguishing feature of 0a7991 is its effect on the next start command. If you press "Start" while this notification is active, the drive will run the motor to the setpoint frequency as expected. Instead, it will execute a tuning routine that injects specific currents to measure the motor. Once this routine is complete, the notification clears automatically.
The drive has not yet identified the motor parameters. : Once measurements conclude, the drive automatically sets
: The motor will typically emit a whistling sound for a few seconds as it measures winding resistance and inductance. Completion
If the PLC is not connected, set to 0, suggests Siemens troubleshooting guides. 3. Why Does 0A7991 Return After Power Off? The key distinguishing feature of 0a7991 is its
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