Huawei SUN2000 Series User Manual page 93

SUN2000-(12KTL-25KTL)-M5 Series
User Manual
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Step 9 Set DC SWITCH to ON. If the inverter status is Shutdown: Command, choose
Maintenance > Inverter ON/OFF, and send a startup command.
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Issue 01 (2022-06-15)
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.
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D Locating Insulation Resistance Faults
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