Sungrow SG33CX - History Record

5 Electrical Connection User Manual
52
Inverter interior
DI DI PGND
PGND
passive switch
Fig. 5-7 Local stop contact
Inverter N
DI DI PGND
PGND
DI DI PGND
PGND
DI DI PGND
PGND
Inverter 1
Inverter 2
...
Controlled
switch
Fig. 5-8 Daisy chain topology
RS485 daisy chain in the master-slave mode
Inverter N
DI DI PGND
PGND
DI DI PGND
PGND
DI DI PGND
PGND
Inverter 1
Inverter 2
...
Controlled
switch
A1 A1 B1 B1
OUT
IN
PC
Logger
Ethernet port
RS485 terminal
Network port
A1 A1 B1 B1
OUT
IN
A1 A1 B1 B1
OUT
Fig. 5-9 Master-salve mode
The inverter directly connected to the Logger is set to be the master
inverter by default, and it sends stop instruction to other inverters via
RS485 communication.