Technical Description; Circuit Description - Sungrow SG3KTL-EC User Manual

User Manual
No. Name
1 LED indicators
2 Buttons
3 LCD Screen
Tab. 2-2 Description of LED Indicators
Name State
On
"RUN"
Blinking
Off
On
"FAULT" Blinking
Off

2.3 Technical Description

2.3.1 Circuit Description

Fig. 2-5 shows the main circuit of the inverter.
The boost circuits raise the input DC voltage. Two string MPP trackers can be utilized
to ensure the maximum power from PV arrays.
The three-level inverter circuit converts the DC power into AC power, which will be
fed into the utility grid via AC terminal.
Meanwhile inverter is equipped with protective circuit to guarantee its safety
operation which can trigger the AC relay if required.
Additionally, a DC switch is integrated for safe disconnection of DC current.
The inverter provides RS485 port, Wi-Fi terminal, and NET port for communication.
Users can look up running information and set parameters through LCD display
panel.
Description
"RUN" and "FAULT". The current running state can be
known from the two indicators. Detailed definition is
shown in Tab. 2-2.
User can operate the LCD menu via the two buttons.
Detailed function is shown in Tab. 10-1.
LCD screen can display the current state, current running
information, historical information, and parameters to be
set.
Description
The inverter is feeding power to the utility grid or in derating
operation.
The inverter is in the process of startup.
Other states.
Communication error, permanent fault, or upgrade failure.
Other faults (alarms excluded).
No fault occurs.
2 Product Introduction
9