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7.Troubleshooting
7.1 Fault Messages
Sunways STH 4~12kW series three-phase hybrid inverter is designed in accordance with
gridoperation standard, and conform to the requirements of the safety and EMC. The inverter
had passed a series of rigorous tests to ensure it runs sustainably and reliably before shipment.
When a fault occurs, the corresponding fault messages will display on the OLED display, and in
this case, the inverter might stop feeding into grid.
The fault messages and their corresponding troubleshooting methods are listed below:
Error Message
Solution
Mains Lost
1. Check whether the mains supply is lost.
2. Check whether the AC breaker and terminal are well connected.
Grid Voltage Fault
1. Check whether the impendence of the AC cable is too high to lead the grid
voltage increased. Change a thicker AC cable if it is.
2. Extend the voltage protection range if it is allowed by the electricity
company.
Grid Frequency Fault
1. Check whether the AC cable is correct and well connected.
2. Change to another country with wider protection range if it's allowed by the
local electricity company.
DCI Fault
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
ISO Over Limitation
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
GFCI Fault
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
PV Over Voltage
Reduce the number of PV panels to make sure the open-circuit voltage of
each string is lower than the inverter max allowed input voltage.
Bus Voltage Fault
1. Check whether the input voltage is over the limitation.
2. Seek for help from the installer or manufacture.
Inverter Over Temperature 1. Check whether the input voltage is over the limitation.
2. Seek for help from the installer or manufacture.
SCI Fault
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
SPI Fault
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
E2 Fault
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
GFCI Device Fault
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
AC Transducer Fault
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
Relay Check Fail
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
Flash Fault
1. Restart the inverter.
2. Seek for help from the installer or manufacture.
7.2 Maintenance
Risk of inverter damage or personal injury due to incorrect service!
Always keep in mind that the inverter is powered by dual sources: PV strings
and utility grid.
Before any service work, observe the following procedure.
1.Disconnect the AC circuit breaker and then set the DC load-break switch of the
inverter to OFF;
2.Wait at least 5 minutes for inner capacitors to discharge completely;
3.Verify that there is no voltage or current before pulling any connector.
Keep non-related persons away!
A temporary warning sign or barrier must be posted to keep non-related
persons away while performing electrical connection and service work.
Restart the inverter only after removing the fault that impairs safety
performance.
As the inverter contains no component parts that can be maintained, never
arbitrarily replace any internal components.
For any maintenance need, please contact Sunways. Otherwise, Sunways shall
not be held liable for any damage caused.
Servicing of the device in accordance with the manual should never be
undertaken in the absence of proper tools, test equipment or the latest revision
of the manual which has been clearly and thoroughly understood.
Attention
Note
Danger
Caution
Items
Methods
Period
System clean
Check the temperature and dust of the inverter.
Clean the inverter enclosure if necessary.
Check if the air inlet and outlet are normal.
Clean the air inlet and outlet if necessary.
Six months to a year (it depends on the
dust contents in air.)
