AI L1L2 Over Voltage

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This fault indicates an L1-L2 over-voltage condition (270 V) detected by the anti-islanding protection, triggering a fast 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-L2 phase-to-phase voltage exceeding 270 V due to a severe grid voltage surge, lightning strike, or significant utility network transient.
• A localized voltage increase between L1 and L2 phases caused by power factor correction issues or a sudden drop in inductive loading on the grid.
• Inverter's internal L1-L2 voltage sensing circuit experiencing a critical failure or severe calibration error causing immediate false detection.
• Anti-islanding parameter P_AI_L1L2_Volt_Max_Fast set marginally below 270V or to an incorrect value, triggering sensitive trips.

Klikk på steg for å spore fremgangen.

1. 1

   Using a true RMS multimeter, measure and record the L1-L2 phase-to-phase voltage at the inverter's AC input terminals (e.g., L1-L2) during system operation.

2. 2

   Verify that the measured L1-L2 voltage does not exceed the specified 270 V threshold or the inverter's relevant parameter (e.g., P_AI_L1L2_Volt_Max_Fast).

3. 3

   Inspect the integrity of the AC input connections for phases L1 and L2 at the inverter (e.g., Terminals L1, L2) for signs of arcing, heat damage, or loose conductors.

4. 4

   Check for external power quality monitoring logs (if available) to identify any grid voltage transients or surges exceeding 270V between L1 and L2.

5. 5

   If the grid is demonstrably stable and below 270V, then a fault in the inverter's internal L1-L2 voltage measurement unit is likely, requiring service.