24
25
4.5.2 RS485 Communication
STT series three-phase inverter supports multiple inverters connection to a data logger in a
daisy chain manner through RS485 protocol.
Multiple inverters connection diagram as shown in Figure 4-21：
4.5.3 Anti-reverse or power limit solution
Anti-reverse or power limit solution, wiring instructions and configuration, please contact
Sunways after-sales at service@sunways-tech.com.
4.5.4 Connection steps:
1) Remove the CT/DRED plate in the bottom of the inverter with a cross screwdriver.
2) Put the cables which you need through the components in the following order: screw cap,
sealing ring, insulator, metal plate, nut and 3/6pin connector, as shown in Figure 4-22:
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 4-23:
The maximum distance between the inverter at the end of the daisy chain and the Datalogger
should be within 1000M.
STT 4~25KTL
series inverter
STT 4~25KTL
series inverter
STT 4~25KTL
series inverter
Data logger
Sunways server
Internet
RS485
RS485
RS485
Internet
Figure 4-21
Suggest using 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
Port
Function
NO.
Definition
Port 1
1.Only Anti-reverse version with this port.
2.Connect external Meter (With 3CTs) to realize
the anti-reverse function on Sunways STT series
inverter.
1
RS485 A
2
RS485 B
3
PE/NULL
Port 1
1.Anti-reverse/RS485/DRED version with this
port.
2.In case of multiple inverters, all the inverters
can be connected via RS485 cables in the daisy
chain manner to realize the communication.
1
RS485 A
2
RS485 B
3
PE/NULL
Port 2
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 inverter that comply with AS/
NZS4777.2:2015 standard.
3.Sunways inverter is fully complied 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 below:
...
