Sungrow SG285HX, User Manual

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DO terminal (fault output dry contact): the relay can be set to fault alarm output, and user
can configure it to be a normal open contact (COM ＆ NO) or a normal close contact (COM ＆
NC).
The relay is initially at the NC terminal, and it will trip to another contact when a fault occurs.
Use LED indicators or other equipment to indicate whether the inverter is in the faulty state.
figure 5-8 Normal open contact
figure 5-9 Normal close contact
Devices connected to the relay should comply with related requirements:
AC-Side Requirements DC-Side Requirements
Max. voltage: 230 Vac
Max. current: 3A
Max. voltage: 30Vdc
Max. current: 3A
5.10.3 Connection Procedure
step 1 Unscrew the swivel nut from the communication terminal and take out the seal.
5 Electrical Connection User Manual