The message "FTAL" Motor frequency low threshold 1 reached indicates a fault condition in Schneider ATV950 drive related to the motor's operating speed falling below a safe minimum limit.

"FTAL" "Motor frequency low threshold 1 reached" warning on a Schneider ATV950 drive indicates that the motor frequency has dropped below a predefined low threshold limit set in the drive's parameters. This can be due to various reasons, such as insufficient load demand, incorrect parameter settings, or issues within the drive or motor.

Steps to Troubleshoot and Resolve "FTAL Motor Frequency Low Threshold 1 Reached" Warning:

1. Identify the Cause:

   • Review Event Logs: Check the drive's event and fault logs to determine when and why the low frequency threshold was reached.
   • Operational Conditions: Assess the conditions during which the warning was triggered, such as load changes, operational speeds, and any recent parameter adjustments.

2. Inspect Drive and Motor Settings:

   • Frequency Parameters: Verify the frequency parameters set in the drive, including minimum frequency, low threshold limits, and frequency scaling.
   • Motor Specifications: Ensure the motor specifications match the drive settings, particularly the rated frequency and speed.

3. Check Load Conditions:

   • Load Analysis: Examine the load on the motor. Insufficient or sudden decreases in load can cause the motor frequency to drop.
   • Mechanical Issues: Inspect for any mechanical issues that might cause reduced load, such as decoupling or loss of load.

4. Review Control Signals:

   • Control Inputs: Verify that control signals to the drive are stable and within expected ranges. Erratic control signals can cause frequency fluctuations.
   • Command Sources: Ensure that command sources, such as PLCs or control systems, are correctly configured and not sending inappropriate frequency commands.