Sungrow SG320HX, User Manual

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Voltage may still be present in AC side circuits after the indicator is off. Pay atten-
tion to the electricity safety during operating.
2.5 DC Switch
The inverter is equipped with four DC switches which can safely disconnect it from PV
strings. Each switch controls the circuits corresponding to DC terminals in the area where
the switch is located.
2.6 Circuit Diagram
The following figure shows the main circuit of the inverter.
figure 2-4 Circuit Diagram
• DC switches can safely disconnect the PV input when necessary to ensure the safe op-
eration of the inverter and the safety of personnel.
• The DC SPD provides a discharge circuit for the DC side over-voltage power to prevent
it from damaging the internal circuits of the inverter.
• EMI filters can filter out the electromagnetic interference inside the inverter to ensure that
the inverter meets the requirements of electromagnetic compatibility standards.
• The MPPT is utilized for DC input to ensure the maximum power from the PV array at dif-
ferent PV input conditions.
2 Product Description User Manual