Troubleshooting - CanadianSolar CSI-25K-T400 Series Installation And Operation Manual

9. Troubleshooting

Alarm Message Failure description
Inverter no power
No power
on LCD
LCD show initializing
Can not start-up
all the time
Over grid voltage
OV-G-V01/02/03/04
UN-G-V01/02 Under grid voltage
Over grid frequency
OV-G-F01/02
Under grid frequency
UN-G-F01/02
High grid impedance
G-IMP
No grid voltage
NO-GRID
Over DC voltage
OV-DC01/02/03/04
OV-BUS Over DC bus voltage
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
IG-AD Grid current sampling fail
Over Temperature
OV-TEM
INI-FAULT Initialization system 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
.38.
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.
9. Troubleshooting
Alarm Message Failure description
ILeak-PRO
Leakage current protection
01/02/03/04
Relay check fail
RelayChk-FAIL
DCinj-FAULT High DC injection current
One of the DC string is
Reve-DC
reversely connected
Screen OFF
Inverter internally damaged
with DC applied
Table 9.1 Fault message and description
NOTE:
If the inverter displays any alarm message as listed in Table 9.1; please
turn off the inverter (refer to Section 5.2 to stop your inverter) and wait for 15
minutes before restarting it (refer to Section 5.1 to start your inverter). If the
failure persists, please contact your local distributor or the service center.
Please keep ready with you the following information before contacting us.
1. Serial number of Three Phase Inverter.
2. The distributor/dealer of Three Phase Inverter (if available).
3. Installation date.
4. The description of problem (i.e. the alarm message displayed on the LCD and the status
of the LED status indicator lights. Other readings obtained from the Information submenu
(refer to Section 6.2) will also be helpful.).
5. The PV array configuration (e.g. number of panels, capacity of panels, number of strings, etc.).
6. Your contact details.
Solution
1. Check AC and DC connection.
2. Check inverter inside cable connection.
1. Restart inverter or contact installer.
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.
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.
.39.