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8. Maintenance
NOTE:
If you need to maintain the inverter at night, please turn off the AC switch first,
then turn off the DC switch, and wait 5 minutes before you do other operations.
8.2 Fan Maintenance
If the fan does not work properly, the inverter will not be cooled effectively.
and it may affect the effective operation of the inverter .
Therefore, it is necessary to clean or replace a broken fan as follows:
1. Turn off the "Grid ON/OFF" switch on the inverter LCD.
2. Disconnect the AC power.
3. Turn the DC switch to "OFF" position.
4. Wait for 15 minutes at least.
5. Remove the 4 screws on the fan plate and pull out the fan assembly slowly.
6. Disconnect the fan connector carefully and take out the fan.
7. Clean or replace the fan. Assemble the fan on the rack.
8. Connect the electrical wire and reinstall the fan assembly. Restart the inverter.
.48.
Figure 8.2
The inverter is designed in accordance with the most important international grid-tied
standards and safety and electromagnetic compatibility requirements. Before delivering to
the customer, the inverter has been subjected to several tests to ensure its optimal operation
and reliability.
In case of failure, the LCD screen will display an alarm message. In this case, the inverter
may stop feeding into the grid. The failure descriptions and their corresponding alarm
messages are listed in Table 9.1:
Alarm Message
Failure description
Inverter no power
No power
on LCD
LCD show initializing
Can not start-up
all the time
OV-G-V01/02/03/04
Over grid voltage
Under grid voltage
UN-G-V01/02
Over grid frequency
OV-G-F01/02
UN-G-F01/02
Under grid frequency
High grid impedance
G-IMP
No grid voltage
NO-GRID
Over DC voltage
OV-DC01/02/03/04
Over DC bus voltage
OV-BUS
Under DC bus voltage
UN-BUS01/02
GRID-INTF01/02
Grid interference
Over grid current
OV-G-I
IGBT-OV-I
Over IGBT current
DC-INTF
DC input overcurrent
OV-DCA-I
Grid current tracking fail
IGFOL-F
Grid current sampling fail
IG-AD
Over Temperature
OV-TEM
9. Troubleshooting
Solution
1.Check PV input connections
2.Check DC input voltage
(single phase >120V, three phase >350V)
3.Check if PV+/- is reversed
1.Check if the connector on main
board or power board are fixed.
2.Check if the DSP connector to
power board are fixed.
1.Resistant of AC cable is too high.
Change bigger size grid cable
2.Adjust the protection limit if it's
allowed by electrical company.
1.Use user define function to adjust the
protection limit if it's allowed by
electrical company.
1.Check connections and grid switch.
2.Check the grid voltage inside inverter
terminal.
1.Reduce the module number in series
1.Check inverter inductor connection
2.Check driver connection
1.Restart inverter
2.Change power board
1.Restart inverter
2.Identify and remove the string to the fault MPPT
2.Change power board
1.Restart inverter or contact installer.
1.Check inverter surrounding ventilation.
2.Check if there's sunshine direct on
inverter in hot weather.
.49.
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