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 the DC SWITCH of the SUN2000 to OFF.
Step 2 Connect a PV string to the SUN2000 and set the DC SWITCH to ON. If the
SUN2000 status is Shutdown: Command, 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 the DC SWITCH to OFF. Go to Step 2
and check the other 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 possibly faulty PV
module based on the percentage. Then go to Step 4.
Step 4 Choose Maintenance > Inverter ON/OFF on the home screen and send a
shutdown command. Set the DC SWITCH to OFF. Check whether the connectors
or DC power cables between the possibly faulty PV modules and adjacent PV
modules are damaged.
● If yes, replace the damaged connectors or DC power cables and then set the
DC SWITCH to ON. If the SUN2000 status is Shutdown: Command, choose
Maintenance > Inverter ON/OFF on the home screen 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, the insulation resistance fault location of the PV
string is complete. Choose Maintenance > Inverter ON/OFF on the
home screen and send a shutdown command. Set the DC SWITCH to
OFF. Go to Step 2 and check the other PV strings one by one. Then, go to
Step 7.
– If the Low insulation resistance alarm is still reported 1 minute after the
the DC side is powered on, choose Maintenance > Inverter ON/OFF on
the home screen and send a shutdown command. Set the DC SWITCH to
OFF and go to Step 5.
● If no, go to Step 5.
Step 5 Disconnect the possibly faulty PV module from the PV string, and use a DC
extension cable with MC4 connectors to connect the adjacent PV modules. Set the
DC SWITCH to ON. If the SUN2000 status is Shutdown: Command, choose
Maintenance > Inverter ON/OFF on the home screen 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, the fault occurred on the disconnected PV module. Choose
Maintenance > Inverter ON/OFF on the home screen, send a shutdown
command, and set the DC SWITCH to OFF. Go to Step 7.
● If the Low insulation resistance alarm is still reported 1 minute after the DC
side is powered on, the fault did not occur on the disconnected PV module.
Go to Step 6.
SUN2000-(250KTL, 280KTL, 300KTL, 330KTL) Series
User Manual 8 System Maintenance
Issue 07 (2023-06-30) Copyright © Huawei Technologies Co., Ltd. 84
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