User Manual 9 Troubleshooting and Maintenance
65
Fans
Check whether there is crack of the fan blade
Check whether there is any abnormal noise of the
fan turning.
Clean or replace the fans.
Once a year
Devices
check
Check the fuses and the DC SPD.
Replace the fuse.
Contact Sungrow to order new DC SPDs.
Every 6 months
Safety
function
Check the LCD stop and emergency stop circuit of
the system.
Simulate shutdown and check stop signal
communication.
Check the warning labels, and replace them if
necessary.
Once or twice a
year
Software
Software optimization.
Check the setting of every parameter.
Once or twice a
year
9.2.2 Maintenance Instruction
Fans’ Maintenance
There are four fans at the side of the inverter for active cooling during running
operation. If the fans are dirty or out of work, the inverter may not be cooled down
well and its efficiency may accordingly decrease. Therefore it is necessary to clean
the dirty fans or replace the broken fans as the following indications.
y Disconnect the inverter from the grid first and then PV arrays before any
maintenance work.
y Lethal voltage still exists in the inverter. Please wait for at least ten
minutes and then perform maintenance work.
y Fans’ maintenance work may only be performed by qualified electricians.
1. Disconnect the AC circuit breaker.
2. Turn off the upstream DC circuit break or cover the PV arrays with opaque
materials. Rotate DC switch at the side of inverter to the “OFF” position.
3. Wait for at least ten minutes.
4. Disconnect all DC and AC connection in the reverse procedures in the “6
Electrical Connection”.
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