Sungrow SG1250UD User Manual

16
5 Operating Mode
5.1 Mode Switching
After being energized, the inverter can switch among different modes, as shown in the
figure below.
Grid-connection
conditions met
Startup
failure
Startup
Initial
Standby
Standby
Fault Stop
Emergency
stop
Key-stop
Unrecoverable fault
Stop for repair
Fault removed
Set time reached
Powered on
or limit power is not 0
Turn Start/Stop button to
“Stop” position
Key-start and
limit power is not 0
LCD/Background stop
Run/
Alarm run
Fault
occurs
Upv greater than
Upvstart, and set time
reached
Turn Start/Stop button to
“Stop” position
Turn Start/Stop button to
“Start” position
DC current weak
for a long time
LCD/Background stop
Fig. 5-1 Operation mode switch
Upv is the DC input voltage of the inverter.
UpvStart is the inverter DC side startup voltage.
5.2 Mode Description
Stop
When an irrecoverable fault occurs, the inverter will enter the "Stop" mode. Disconnect the
inverter AC and DC switches manually and check the AC and DC sides thoroughly. Restart
the device when the fault is removed.
Initial Standby
When the inverter upstream and downstream connections are connected and the AC/DC
main switches are in the "ON" position, the inverter turns to the Initial Standby mode.
The inverter continuously checks if the PV array and the grid meet the grid-connection
requirements. If the inverter DC input voltage is higher than the inverter startup voltage and
the startup time is reached, whilst the requirements of the grid side parameter are satisfied,
the inverter turns from the Initial Standby mode into the Startup mode.

Sungrow SG1250UD Specifications

General

Brand	Sungrow
Model	SG1250UD
Category	Inverter
Language	English