Sungrow SG250K3, Operation Manual, Page: 23 / 66

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4.2. Modes Transition
When energized, the SG250K3 switches among different modes as pictured
below.
Start-up
Run
Commissionling
Stand-by
Fault
Fault occurs
1.Fault resolved for 5 minutes
2.Vpv>450V for 1 minutes
Key-stop
Emer-stop
1. Turn the start/stop switch to start position
2. Release the emergency stop button
3. Stop the inverter through touch screen menu
to clear the
“
Emer-stop
”
state
4. Start the inverter through touch screen menu
Vpv>450
V for 1 m
inutes
Normal Operation
Vpv>450V for 1 minutes
Ipv
≈
0A for 3 minutes
Press ES button
(OR)Turn the start/stop switch to stop position
Stop the inverter through touch screen menu
1. Turn the start/stop switch to start position
2. Release the emergency stop button
3. Start the inverter through touch screen menu
Figure 4-1 Transition of operation states
The states displayed in the touch screen menu are explained in Table 4-1.
Table 4-1 State explanations of SG250K3
State Simple Explanation
Key-stop The inverter is stopped by touch screen stop command
Emer-stop
1. The inverter is stopped by pressing down the
emergency button
2. The inverter is stopped by turning the start/stop
switch to the “stop” position
Stand-by The inverter is ready to switch to Run mode
Start-up The inverter is ready to switch to Run mode(only
appear once during commissioning )
Run The inverter is performing correct PV generation
operation
Fault A fault is happened* 1,2
*1.the fault type will be displayed like “Vdc-high”or “Vac-low” etc.
* 2.The “Com-flt” will also be displayed in the state position in the touch screen,
but in fact it is not a state, it means there is a fault between touch screen and DSP,
which also means that users can not check or set parameters through touch screen
control menu during this fault. But this fault will not stop the inverter, which is
different from Fault condition.