Connection Procedure - Sungrow SG33CX User Manual

5 Electrical Connection
the shielding layer of the communication cable should be single-point
grounded.
120ohm
ON
Inverter
OUT
Logger
 The length of the RS485 cable should be no longer than 1,200m.
 If multiple inverters are connected to the
the number of permissible daisy chains and the number of devices
allowed to be connected should meet the requirements (refer to the
user manual for the Logger3000).

5.9.3 Connection Procedure

 RS485 communication cables should be shielded twisted pair
cables or shielded twisted pair Ethernet cables.
 There are three communication terminals, and the silkscreen
marks are COM1/COM3/COM4. Please choose according to the
actual situation.
Terminal Block
Remove the communication junction box, see 5.7.1 Remove the
Step 1
Junction Box.
Loosen the swivel nut of the junction box and select an appropriate seal
Step 2
according to cable outer diameter. Lead the cable through the swivel nut,
seal, and junction box successively.
46
OFF
SW1
Inverter 2~(N-1)
IN
Monitoring station
Fig. 5-4 Terminal resistor state（N≥15）
120ohm
ON
OFF
SW1
OUT
IN
data collector
User Manual
120ohm
ON
OFF
SW1
Inverter N
OUT
Logger3000,