DC Bus Voltage Fault

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A major fault where abnormal external conditions have triggered DC circuit protection inside the SUN2000, causing issues with the internal DC bus voltage. This can be due to sudden input disconnection, sharp changes in grid voltage, or grid phase imbalances, leading to inverter shutdown.

• The SUN2000 input is suddenly disconnected, or shielded PV strings result in a sharp change in output power (Reason ID = 3).
• The input energy of the SUN2000 cannot be vented quickly due to a sharp change in grid voltage, causing an increase in internal voltage (Reason ID = 9 or 11).
• The internal control circuit of the SUN2000 is unable to keep up with changes due to grid phase imbalances (Reason ID = 10).

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1. 1

   Observe if the SUN2000 automatically reverts to normal operating status after the external working conditions normalize.