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
9. Troubleshooting
Table 9.1 Fault message and description
1.Remove all DC input, reconnect and
restart inverter one by one.
2.Identify which string cause the fault and
check the isolation of the string.
DCinj-FAULT
High DC injection current
1.Check AC and DC connection
2.Check inverter inside cable connection.
1.Restart inverter or contact installer.
Alarm Message
Failure description
Solution
PV ISO-PRO
01/02
PV isolation protection
ILeak-PRO
01/02/03/04
Leakage current protection
RelayChk-FAIL
Relay check fail
AFCI self-detection
(model with AFCI
module)
AFCI module self-detect fault
1.Restart inverter or connect technician.
Arcing protection
(model with AFCI
module)
Detect arc in DC circuit
1. Check inverter connection whether arc
exists and restart inverter.
INI-FAULT
Initialization system fault
1.Restart inverter or contact installer.
12Power-FAULT
12V power supply fault
DSP-B-FAULT
Comm. failure between main
and slave DSP
Reve-DC
One of the DC string is
reversely connected
1. Please check the inverters’ PV string polarity,
if there are strings reversely connected wait for
the night when the solar irradiance is low and the
PV string current down below 0.5A. Turn off the
two DC switchs and fix the polarity issue.
Screen OFF
with DC applied
Inverter internally damaged
1.Do not turn off the DC switches as it will
damage the inverter.
2.Please wait for the solar irradiance reduces
and confirm the string current is less than
0.5A with a clip-on ammeter and then turn
off the DC switches.
3.Please note that any damages due to wrong
operations are not covered in the device
warranty.
.58.
.59.
