Overcurrent on AC side

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The Fronius Primo GEN24 208-240 inverter has detected an overcurrent condition on its AC output, meaning the current flowing into the grid is higher than permitted. This fault indicates a potential short circuit or overload condition in the AC connection or grid.

• Overcurrent at the AC connection.
• Short circuit at the AC connection.
• Malfunction in the inverter's internal current measurement circuitry.

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1. 1

   Disconnect the Fronius Primo GEN24 208-240 inverter from the AC grid and visually inspect the AC connection cables and terminals for any signs of damage, short circuits, or loose connections.

2. 2

   Check the AC cables between the inverter and the grid connection point for insulation breakdown or damage.

3. 3

   Verify the ratings of external AC overcurrent protection devices (circuit breakers, fuses) are appropriate for the inverter's output.

4. 4

   Ensure no external loads are causing a short circuit or extreme overload condition directly at the inverter's output if operating in a microgrid setup.

5. 5

   If the issue persists after external checks, this may indicate an internal fault with the inverter; contact Fronius service.