The message "RTAH" Reference frequency high threshold reached in Schneider ATV950 drive indicates a fault condition related to the speed reference provided to the drive.

The RTAH Reference frequency high threshold reached warning on a Schneider ATV950 drive indicates that the reference frequency (the frequency command or setpoint) has exceeded a predefined high threshold limit set in the drive's parameters.

1. This can occur due to various reasons, such as incorrect parameter settings, control signal issues, or unexpected operational conditions.
2. Verify frequency parameters and motor specifications.
3. Verify control inputs and command sources.
4. Modify frequency thresholds and acceleration/deceleration rates if needed.