AI L1 Over Voltage

What does F31 mean?

This fault indicates an L1 over-voltage condition (130 V) detected by the anti-islanding protection, triggering a slow disconnect. This mechanism ensures the inverter disconnects from an unstable grid, protecting both the inverter and grid from potential damage due to excessive voltage.

• Grid L1-Neutral voltage exceeding 130 V for a sustained period, indicating persistent grid voltage instability or a utility over-voltage condition.
• Gradual voltage creep on phase L1 due to an imbalanced grid or nearby generator operations, exceeding the slow trip threshold.
• Inverter's L1 voltage sensing circuit drifting out of calibration or experiencing intermittent measurement errors over time.
• Anti-islanding parameter P_AI_L1_Volt_Max_Slow set too close to nominal, causing frequent trips during minor voltage fluctuations.

Click steps to track your progress.

1. 1

   Using a true RMS multimeter, continuously monitor the L1-Neutral voltage at the inverter's AC input terminal L1 over several hours to detect persistent high voltage.

2. 2

   Compare the sustained L1-Neutral voltage readings against the specified 130 V trip threshold and the inverter's P_AI_L1_Volt_Slow parameter.

3. 3

   Verify that the neutral conductor connection to the inverter (Terminal N) and the L1 phase terminal (Terminal L1) are secure and free from corrosion.

4. 4

   Contact the utility provider to report sustained high voltage conditions on phase L1 at your site and request a grid voltage stability check.

5. 5

   If external voltage is stable, verify the inverter's internal L1 voltage measurement offset parameter (e.g., P_AI_L1_Volt_Offset) for potential misconfiguration.