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7. Troubleshooting
7.1 Fault Messages
Sunways STT 4~25kW series three-phase inverter is designed in accordance with grid
operation 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
Troubleshooting
1. Check whether cables are all firmly connected and DC switch is on.
No Display
2. Check whether the input voltage meets the working voltage.
1. Check whether the mains supply is lost.
Mains Lost
2. Check whether the AC breaker and terminals are well connected.
1. Check whether the safety regulation setting is correct.
2. Check the voltage of the grid. If the grid voltage exceeds the allowed range of
Grid Voltage Fault
inverter protection parameters, please contact the local grid company to resolve.
3. 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.
1. Check whether the safety regulation setting is correct.
Grid Frequency Fault
2. Check the frequency of the grid. If the grid frequency exceeds the allowed range
of inverter protection parameters, please contact the local grid company to resolve.
1. Check whether the PV panels, cables, and connectors are broken or water
ISO Over Limitation
leaked.
2. Check whether there is a reliable inverter grounding line.
1. The ground current is too high.
GFCI Fault
2. Check whether the PV cable has a short circuit to ground.
1. Input voltage is too high.
PV Over Voltage
2. 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.
Inverter Over
1. Check whether the inverter is direct exposure to the sunlight.
Temperature
2. Reduce ambient temperature.
DCI Fault
Bus Voltage Fault
SCI Fault
SPI Fault
1. Restart the inverter, wait a moment for inverter recovery.
E2 Fault
2. If the fault occurs repeatedly, please contact Sunways.
GFCI Device Fault
AC Transducer Fault
Relay Check Fail
Flash Fault
1. Stop the inverter and disconnect the AC&DC cables.
Fan Fault
2. Check whether the fan is blocked by foreign matters. If not, replace the fan.
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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.
Danger
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!
Caution
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
Attention
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
Note
undertaken in the absence of proper tools, test equipment or the latest revision
of the manual which has been clearly and thoroughly understood.
Items
Methods
Check the temperature and dust of the inverter.
Clean the inverter enclosure if necessary.
System clean
Check if the air inlet and outlet are normal.
Clean the air inlet and outlet if necessary.
Period
Six months to a year (it depends on
the dust contents in air.)
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