AI L1L2 Under Voltage

Was bedeutet F39 ?

This fault indicates an under-voltage condition between L1 and L2 phases detected by the anti-islanding protection, exceeding the AC qualification limits. This mechanism ensures the inverter disconnects from the grid if grid power is unstable or absent, preventing dangerous backfeeding and potential damage to equipment.

• Grid L1-L2 phase-to-phase voltage dropping below the inverter's configured AC qualification limit (typically a percentage of nominal voltage), indicating significant grid instability.
• Widespread utility grid under-voltage condition, brownout, or severe voltage imbalance causing the L1-L2 voltage to fall below acceptable operational limits.
• Inverter's internal L1-L2 voltage sensing circuitry suffering from signal degradation, intermittent component failure, or miscalibration.
• Anti-islanding parameter P_AI_L1L2_Volt_Min_Qual set too high, triggering a disconnect on minor, acceptable grid voltage variations.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Using a true RMS multimeter, measure and record the L1-L2 phase-to-phase voltage at the inverter's input terminals over an extended period (e.g., 30 minutes).

2. 2

   Compare the measured L1-L2 voltage values to the inverter's configured AC qualification limit parameter (e.g., P_Grid_Volt_Min_L1L2_Qual).

3. 3

   Inspect the integrity of the AC input connections for phases L1 and L2 at the inverter (e.g., Terminals L1, L2) for loose terminals or poor contact.

4. 4

   Consult the utility provider to inquire about recent grid stability, voltage anomalies, or work performed on the local distribution network.

5. 5

   If grid voltage is stable and within acceptable range, perform an internal inverter diagnostic on the voltage sensing hardware or replace the control board.