Sungrow SG250K3, Operation Manual

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8. Troubleshooting
Chapter 8 gives the basic troubleshooting methods.
8.1. LED Indicated Fault Troubleshooting
Table 8-1 LED states during normal working
LED name state explanation
POWER light The power supply of the inner circuit is OK
OPERATION light The inverter is in correct grid connection working state
FAULT shut No fault occurs
Table 8-2 LED fault and simple troubleshooting
LED state explanation
No LED flashes
and
touch
screen no
display
Disconnect the AC and DC voltage and keep disconnected for 5 min.
Afterwards, reconnect the DC voltage and then the AC voltage.
If the device does still not run it needs to be exchanged or repaired.
POWER shut
Power supply of the inverter is not working
，
First make sure that the grid is available and grid connection wires are
OK. Disconnect the AC and DC voltage and keep disconnected for 5
min. Afterwards, reconnect the DC voltage and then the AC voltage.
If the power LED never light after restart, please contact Sungrow.
Operation shut The inverter is not in the grid connection state.
First check all the AC and DC wires are correctly connected.
Use multimeter to measure the DC input voltage and make sure the DC
input voltage exceeds the start threshold of the inverter operation.
Make sure the grid is available and parameters are within the inverter
specification. If all the conditions above are checked OK and this light
still not light, Please contact Sungrow.
FAULT light A fault has occurred and is not solved.
Please refer to the touch screen fault message for the detailed fault
information and accordingly take troubleshooting. This LED will shut
when the fault disappears. Please contact Sungrow if this LED keeps
light all the time.