.51.
.50.
9. Troubleshooting
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
OV-G-V01/02/03/04
OV-G-F01/02
UN-G-F01/02
G-IMP
NO-GRID
OV-DC01/02/03/04
OV-BUS
UN-BUS01/02
GRID-INTF01/02
OV-TEM
Failure description
Over grid voltage
Under grid voltage
Over grid frequency
Under grid frequency
High grid impedance
No grid voltage
Over DC voltage
Over DC bus voltage
Under DC bus voltage
Grid interference
Over Temperature
Solution
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.Check connections and grid switch.
2.Check the grid voltage inside inverter
terminal.
1.Reduce the module number in series
1.Restart inverter
2.Change power board
1.Check PV input connections
2.Check DC input voltage
(single phase >120V, three phase >350V)
3.Check if PV+/
-
is reversed
Inverter no power
on LCD
No power
LCD show initializing
all the time
Can not start-up
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.Check inverter surrounding ventilation.
2.Check if there’s sunshine direct on
inverter in hot weather.
1.Use user define function to adjust the
protection limit if it’s allowed by
electrical company.
1.Check inverter inductor connection
2.Check driver connection
UN-G-V01/02
DC-INTF
DC input overcurrent
1.Restart inverter
2.Identify and remove the string to the fault MPPT
2.Change power board
IGFOL-F
Grid current tracking fail
OV-G-I
Over grid current
OV-DCA-I
IGBT-OV-I
Over IGBT current
1.Restart inverter or contact installer.
IG-AD
Grid current sampling fail
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
.
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.
Figure 8.2
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. Maintenance