Operation Manual
10 Troubleshooting
47
LED state
Description
POWER is off
No power supply to the inverter.
First ensure the power supply and the grid-connection are normal.
Disconnect the AC/DC voltage for 5 minutes and reconnect them.
If the LED keeps off, please contact Sungrow.
OPERATION is off
The grid is not in grid-connection state.
First check all the AC/DC connection. Make sure, using multimeter,
that the DC input voltage exceeds the inverter startup voltage.
Make sure the grid and parameters meet the requirements of safe
operation.
If the malfunction cannot be removed by following these
instructions, please contact Sungrow.
FAULT is on
A fault is not removed yet.
Please refer to the touch screen for the detailed fault information and
take corresponding troubleshooting.
If the malfunction cannot be removed by following these
instructions, please contact Sungrow.
10.3
Fault and Troubleshooting on the LCD screen
This section is dedicated to the faults shown on the LCD, possible reasons and troubleshooting.
In case the fault cannot be removed following the instructions in this section, please contact
Sungrow.
Fault
Vdc-high
Possible
reason
DC voltage exceeds the max. DC voltage
Measure
Check the configuration of the PV array and reduce the open-circuit voltage of the PV
array
Note
Please contact the installers of the PV arrays
Fault
Vac-high
Possible
reason
The grid voltage is above the maximum grid voltage
Measure
Check the grid voltage (or if the grid-connected wire is too thin)
Remark
Inverter automatically reconnects to the grid once the grid voltage recovers normal
Fault
Vac-low
Possible
reason
The grid voltage is below the minimum grid voltage
Measure
Check the grid voltage
Check if the AC cables are securely connected.
Remark
Inverter automatically reconnects to the grid once the grid voltage recovers normal
Fault
PV pol-rev
Possible
reason
The positive and negative poles of the DC side are connected reversely.
Measure
Check the DC connection to for reverse connection after inverter voltage-free
Remark
-
