Sunways STT-4KTL - 7 Troubleshooting

44 45
Error Message Description Troubleshooting
Grid Frequency
Fault
Grid over frequency or under-
frequency, the grid frequency
is higher or lower than the set
protection value.
① Check whether the safety regulation settings
are correct.
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.
ISO Over Limitation
Low system insulation resis-
tance, which is generally caused
by poor insulation to ground of
the module/cable or by rainy and
damp environment.
① Check whether the PV panels, cables, and
connectors are broken or water leaked.
② Check whether there is a reliable inverter
grounding line.
GFCI Fault Excessive leakage current.
① The ground current is too high.
② Check whether the PV cable has a short circuit
to ground.
PV Over Voltage PV over voltage is too high.
① Input voltage is too high.
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 Tem-
perature
Temperature anomaly, the tem-
perature of the interior of the
inverter is excessively high and
out of the safe range.
① Check whether the inverter is directly exposed
to the sunlight.
② Reduce ambient temperature.
DCI Fault
DC Injection Hight. Inverter de-
tects a higher DC component in
AC output.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
7 Troubleshooting
Error Message Description Troubleshooting
Bus Voltage Fault BUS voltage is over-high.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
SCI Fault
Internal communication fails.
Caused by a strong external
magnetic 󽗉eld etc.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
SPI Fault
Internal communication fails.
Caused by a strong external
magnetic 󽗉eld etc.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
E2 Fault
Internal storage anomaly.
Caused by a strong external
magnetic 󽗉eld etc.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
GFCI Device Fault GFCI device anomaly.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
AC Transducer Fault AC transducer anomaly.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
7 Troubleshooting