string. Log in to the app, 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. Then, go to
Step 8.
– If the DC side is powered on 1 minute later, the Low insulation
resistance alarm is still reported. Log in to the app, choose Maintenance
> Inverter ON/OFF on the home screen, and send a shutdown command.
Set DC SWITCH to OFF and go to Step 5.
● If no, go to Step 5.
Step 5 Disconnect the possible faulty PV module and the paired optimizer from the PV
string, and use a DC extension cable with an MC4 connector to connect the PV
module or optimizer adjacent to the possible faulty PV module. Set DC SWITCH to
ON. If the inverter 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 and
optimizer. Choose Maintenance > Inverter ON/OFF, send a shutdown
command, and set DC SWITCH to OFF. Go to Step 7.
● If the Low insulation resistance alarm is reported 1 minute after the DC side
is powered on, the fault did not occur on the disconnected PV module and
optimizer. Go to Step 6.
Step 6 Log in to the app, choose Maintenance > Inverter ON/OFF on the home screen,
and send a shutdown command. Set DC SWITCH to OFF, reconnect the
disconnected PV module and optimizer, and repeat Step 5 to check the PV
modules and optimizers adjacent to the possible fault location.
Step 7 Determine the position of the ground insulation fault:
● Disconnect the possible faulty PV module from the optimizer.
● Connect the possible faulty optimizer to the PV string.
● 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, the fault is on the possible faulty PV module.
– If the Low insulation resistance alarm is reported 1 minute after the DC
side is powered on, the fault is on the possible faulty optimizer.
● Log in to the app, choose Maintenance > Inverter ON/OFF on the home
screen, and send a shutdown command. Set DC SWITCH to OFF, replace the
faulty component, and complete troubleshooting the insulation resistance
fault. Go to Step 2 and check rest of the PV strings one by one. Then, go to
Step 8.
Step 8 Set DC SWITCH to ON. If the inverter status is Shutdown: Command, choose
Maintenance > Inverter ON/OFF, and send a startup command.
----End
SUN2000-(5K-12K)-MAP0 Series
User Manual 8 System Maintenance
Issue 01 (2024-05-13) Copyright © Huawei Digital Power Technologies Co., Ltd. 116
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