9 Troubleshooting and Maintenance
User Manual
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Step 9
Release the locking part of four
connectors by pressing on the ribbing
of the locking hooks and pull outwards.
Step 10
Remove fans from the inverter.
Step 11
You can clean the dirty fans with soft brush or vacuum cleaner. Or
replace the broken fans.
Step 12
Re-assemble the fans onto the inverter in the reverse procedures
and then restart the inverter.
Replacing the String Fuses
For optional version inverter, it is necessary to replace the blown string fuses
due to overcurrent.
Step 1
Disconnect AC circuit breaker.
Step 2
Rotate DC switch to the “OFF” position and then turn off the upstream
DC circuit break or pull off the MC4 terminal.
Step 3
Wait for at least ten minutes.
Step 4
Open the inverter as described in section “8 Disconnecting, Dismantling
and Disposing the Inverter”.
Step 5
Observe the string fuse assignment and check the fuse conductivity
using the multimeter. A non-conductive fuse indicates a fault in the
affected string.
Step 6
Check the affected string by installer of the PV generator and replace the
defective string fuse with same specification (order from Sungrow).
Step 7
Remove the blown string fuse.
Step 8
Insert the new fuse into the fuse holder.
Step 9
Close the inverter and startup the inverter again.
Clean Air Inlet and Outlet
A huge amount of heat is generated in the process of running the inverter. The
inverter adopts a controlled forced-air cooling method.
In order to maintain good ventilation, please check whether there is anything
blocking the air inlet and outlet.
Clean the air inlet and outlet with soft brush or vacuum cleaner if necessary.
