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9.2 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 performing any service work, observe the following procedure.
• Disconnect the AC circuit breaker and then set the DC load-break switch of
the inverter to OFF;
• Wait at least 5 minutes for inner capacitors to discharge completely;
• Verify that there is no voltage or current before pulling any connector.
If the PV system is equipped with RSDs, please pay attetion to the following
issue when doing the maintenance job to a certain inverter:
Even if the target inverter is shut down, the RSDs in the corresponding PV
strings connected to this inverter maybe still keep alive due to PLC signals
injected from other alive inverters once the DC cables are not separated from
inverter to inverter. In this senario, it is recommended to remove the PV strings
from the target inverter in first priority as normal, then going on with the
maintenance job.
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 requirement, please contact SUNGROW. Otherwise,
SUNGROW shall not be held liable for any damage caused.
9 Troubleshooting and Maintenance User Manual
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