Figure 8-1 Percentage of short-circuit positions
Procedure
If the irradiance or the PV string voltage is too high, the insulation resistance fault
location may fail. In this case, the fault location status on the Alarm details
screen is Conditions not met. Perform the following steps to connect PV strings to
the inverter one by one to locate the fault. If the system is not congured with
any optimizer, skip the corresponding optimizer operations.
Step 1 Ensure that the AC connections are normal. Log in to the FusionSolar app, choose
Maintenance > Inverter ON/OFF on the home screen, and send a shutdown
command. Set DC SWITCH to OFF.
Step 2 Connect one PV string to the inverter, and set DC SWITCH to ON. If the inverter
status is Shutdown: Command, log in to the app, choose Maintenance >
Inverter ON/OFF on the home screen, and send a startup command.
Step 3 Choose Alarm on the home screen, enter the Active alarm screen, and check
whether a Low insulation resistance alarm is reported.
● If no Low insulation resistance alarm is reported 1 minute after the DC side
is powered on, choose Maintenance > Inverter ON/OFF on the home screen,
and send a shutdown command. Set DC SWITCH to OFF. Go to Step 2 and
check rest of the PV strings one by one.
● If a Low insulation resistance alarm is reported 1 minute after the DC side is
powered on, check the percentage of possible short-circuit positions on the
Alarm details screen and calculate the location of the possible faulty PV
module based on the percentage. Then go to Step 4.
Step 4 Log in to the app, choose Maintenance > Inverter ON/OFF on the home screen,
and send a shutdown command. Set DC SWITCH to OFF. Check whether the
connectors or DC power cables between the optimizer and PV module, between
adjacent PV modules, or between adjacent optimizers on the possible fault
position are damaged.
● If yes, replace the damaged connectors or DC power cables, and then set DC
SWITCH to ON. If the inverter status is Shutdown: Command, choose
Maintenance > Inverter ON/OFF, and send a startup command. View alarm
information.
– If no Low insulation resistance alarm is reported 1 minute after the DC
side is powered on, troubleshoot the insulation resistance fault of the PV
SUN2000-(5K-12K)-MAP0 Series
User Manual 8 System Maintenance
Issue 01 (2024-05-13) Copyright © Huawei Digital Power Technologies Co., Ltd. 115
To Next Page
Loading...
