Sunways STT-4KTL - Error Message; Maintenance

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7 Troubleshooting
Error Message Description Troubleshooting
Relay Check Fail
Self-checking of relay fails.
neutral & ground cable are not
connected well on AC side or just
occasional failure.
① Check use multi-meter if there is high voltage
(normally should be lower than 10V) between
N&PE cable on AC side. If the voltage higher than
10V, it means the Neutral & ground cable are not
connected well on AC side or restart inverter.
② If the neutral & ground cable are connected
well, please contact Sunways.
Flash 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.
External Fan Fault External fan anomaly.
① Stop the inverter and disconnect the AC&DC
cables.
② Check whether the fan is blocked by foreign
matters. If not, replace the fan.
Internal Fan Fault Internal fan anomaly.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
※ 7.2 Maintenance
Danger
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 invert-
er 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.
Caution
Keep non-quali󽗉ed persons away!
A temporary warning sign or barrier must be posted to keep non-quali󽗉ed persons away
while performing electrical connection and service work.
Attention
Restart the inverter only after removing the fault that impairs safety performance.
Never arbitrarily replace any internal components.
For any maintenance support, please contact Sunways. Otherwise, Sunways shall not be
held liable for any damage caused.
Note
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.
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 de-
pends on the dust contents
in air.)
7 Troubleshooting