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6 General Operation
The auto test will start when the correct test item is selected, and the test result will be
displayed on the screen when it nished. If the test was successful, it will display "Test
Pass", otherwise will display "Test Fail”. After each item tested, the inverter will recon-
nect to the grid and automatically start the next test according to the requirements of CEI
0-21.
6.4.1 Power derating for voltage variation (Volt-Watt mode)
6.4.2 Reactive power regulation for voltage variation (Volt-VAr mode)
※ 6.4 Power Quality Response Modes
This mode can be enabled via the conguration software. Please contact Sunways Tech-
nical Support at service@sunways-tech.com for more information.
This mode can be enabled via the conguration software. Please contact Sunways Tech-
nical Support at service@sunways-tech.com for more information.
※ 6.5 Online Monitoring APP
7 Troubleshooting
※ 7.1 Error Message
Sunways STT 4-25kW series three phase inverter is designed in accordance with grid op-
eration standards, and conform to the requirements of safety and EMC. The inverter had
passed a series of rigorous tests to ensure it runs sustainably and reliably before ship-
ment.
When a fault occurs, the corresponding error message will be shown 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 Description Troubleshooting
No Display No Display
① Check whether cables are all rmly connected
and DC switch is on.
② Check whether the input voltage meets the
working voltage.
Mains Lost
Grid power outage, AC switch or
circuit is disconnected.
① Check whether the mains supply is lost.
② Check whether the AC breaker and terminals
are well connected.
Grid Voltage Fault
Grid overvoltage or undervolt-
age, the grid voltage is higher
or lower than the set protection
value.
① Check whether the safety regulation setting is
correct.
② Check the voltage of the grid. If the grid volt-
age exceeds the allowed range of inverter pro-
tection parameters, please contact the local grid
company to resolve.
③ Check whether the impendence of the AC ca-
ble is too high. Replace with a thicker AC cable if
that is the case.
7 Troubleshooting
Sunways inverter provides a monitoring port that can collect and transmit data from
the inverter to Sunways monitoring platform via an external monitoring device. Please
refer to the product nameplate on side of enclosure to get the monitoring application. If
download issues exist , contact your dealer or Sunways technical support.
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