Sungrow SG250HX-US, User Manual, Page: 8 / 106

VI
4.5.1 PV Bracket-Mounted Installation ..........................................................23
4.5.2 Wall-Mounted Installation.....................................................................24
4.6 Installing the Inverter.....................................................................................25
5 Electrical Connection
.....................................................................................27
5.1 Safety Instructions ........................................................................................27
5.2 Terminal Description .....................................................................................28
5.3 Electrical Connection Overview .....................................................................29
5.4 Crimp OT / DT terminal .................................................................................31
5.5 External Grounding Connection .....................................................................32
5.5.1 External Grounding Requirements........................................................33
5.5.2 Connection Procedure.........................................................................33
5.6 Opening the Wiring Compartment ..................................................................33
5.7 AC Cable Connection ...................................................................................34
5.7.1 AC-Side Requirements ........................................................................34
5.7.2 Requirements for OT/DT Terminal ........................................................37
5.7.3 Connection Procedure.........................................................................37
5.8 DC Cable Connection ...................................................................................40
5.8.1 PV Input Configuration ........................................................................40
5.8.2 Assembling the PV Connectors ............................................................41
5.8.3 Installing the PV Connector..................................................................44
5.9 Wiring of Tracking System Power Cable (Optional) .........................................44
5.10 RS485 Connection......................................................................................47
5.10.1 Interface Description .........................................................................47
5.10.2 RS485 Communication System ..........................................................48
5.10.3 Connection Procedure(Terminal Block) ...............................................50
5.11 PLC Communication Connection .................................................................52
5.12 Dry Contact Connection ..............................................................................52
5.12.1 Dry Contact Function .........................................................................52
5.12.2 Wiring Procedure ..............................................................................54
5.13 Closing the Wiring Compartment..................................................................54
6 Commissioning
...............................................................................................55
6.1 Inspection before Commissioning ..................................................................55
6.2 Commissioning Procedure ............................................................................55
7 iSolarCloud App
..............................................................................................57
7.1 Brief Introduction ..........................................................................................57
7.2 Installing the App ..........................................................................................57