Maintenance; Troubleshooting - CanadianSolar CSI Manual

8. Maintenance

Canadian Solar Three Phase Inverter does not require any regular maintenance. However,
cleaning the dust on heat-sink will help the inverter to dissipate the heat and increase its life
time. The dust can be removed with a soft brush.
CAUTION:
Do not touch the inverter's surface when it is operating. Some parts of the
inverter may be hot and cause burns. Turn off the inverter (refer to Section
6.2) and wait for a cool-down period before before any maintenance or
cleaning operation.
The LCD and the LED status indicator lights can be cleaned with a damp cloth if they are too
dirty to be read.
NOTE:
Never use any solvents, abrasives or corrosive materials to clean the inverter.

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:
.38.
9. Troubleshooting
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
OV-DC01/02/03/04 Over DC voltage
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
Initialization system fault
INI-FAULT
Comm. failure between main
DSP-B-FAULT
and slave DSP
12Power-FAULT 12V power supply fault
PV ISO-PRO
PV isolation protection
01/02
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 .
3. 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.
1. Restart inverter or contact installer.
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.
.39.