24
25
Figure 4-21
1
1
1
3
5
2
2
3
3
2
4
6
Port 1
Port 2
Port 3
1.This port is available on export limitation & control, RS485 and DRED
versions of the inverter only.
2.The Pin connector in inverter Port1 and Port2 may vary from 2Pin to 3pin
according to the shipment version.
Note
Port
Function
NO.
Definition
Port 1
1.Only Export limitation & control version with
this port.
2.Connect external CT to activate the Export
Limitation&control function of Sunways STS
series inverter.
3.The color of CT is only identified by Sunways.
1
Connect S1 cable (Black CT) or white
black cable (Blue CT)
2
Connect S2 cable (Black CT) or black
cable (Blue CT)
3
NULL
Port 2
1.Export limitation & control/RS485/DRED
version with this port.
2.In case of multiple inverters, all the inverters
can be daisy-chained via RS485 cables.
1
RS485 A
2
RS485 B
3
PE/NULL
Port 3
1.Only DRED version with this port.
2.DRED means demand response enable device.
The AS/NZS 4777.2:2015 requires inverters to
support demand response mode (DRM). This
function is for inveters that comply with AS/
NZS4777.2:2015 standard.
3.Sunways inverter is fully compliant with
all DRM. The 6pin connector is used for DRM
connection.
4.Support DRM command: DRM0, DRM5, DRM6,
DRM7, DRM8.
1
COM/DRMO
2
REFGEN
3
DRM4/8
4
DRM3/7
5
DRM2/6
6
DRM1/5
Different versions of the inverter have different terminals, which are defined as follows:
4.5.2 RS485 Communication
STS series single-phase inverter supports multiple inverters daisy-chain connection to a data
logger via RS485 communication.
Multiple inverters connection diagram as shown in Figure 4-22：
4.5.3 Export limitation & control or power limit solution
Export limitation & control or power limit solution, wiring instructions and configuration,
please contact Sunways after-sales at [email protected].
4.5.4 Wiring Steps:
1) Remove the CT/DRED plate in the bottom of the inverter with a cross screwdriver.
2) Put the cable through the connector and connect to the terminal in the following order:
screw cap, sealing ring, insulator, metal plate, nut and 3/6pin connector, as shown in Figure
4-23:
3) Insert the cable to the port in the 3/6pin connector and fasten with a screwdriver.
4) Insert the 3/6pin connector into the 3/6pin connecter inside the inverter, and screw the CT/
DRED plate back with a cross screwdriver, as shown in Figure 4-24:
The maximum distance between the inverter at the end of the daisy chain and the Data logger
should be within 1000m.
STS 3~6KTL
series inverter
STS 3~6KTL
series inverter
...
STS 3~6KTL
series inverter
Data logger
Sunways server
Internet
Internet
LAN/WiFi
/GPRS
RS485
RS485
RS485
Router
Figure 4-22
It is recommended to use the RS485 communication cable with a cross-
sectional area of 0.75-1.5mm² and an outer diameter of 5mm-10mm.
RS485 cable requirements: Shielded twisted-pair cable or shielded twisted
Ethernet cable.
Attention
