Huawei SUN2000-2KTL-L1 User Manual page 119

SUN2000-(2KTL-6KTL)-L1
User Manual
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Step 5 Set the DC switch to OFF, disconnect the possible faulty PV modules and
corresponding optimizers from the PV string, and connect a DC extension cable
with an MC4 connector to the adjacent PV modules or optimizers. Set the DC
switch to ON and view the alarm information.
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Step 6 Set the DC switch to OFF, reconnect the removed PV module and optimizer, and
repeat
Step 7 Determine the position of the ground insulation fault.
1.
2.
3.
4.
5.
Step 8 If the solar inverter connects to batteries, turn on the auxiliary power switch of the
battery and then the battery switch. Set the DC switch to ON. If the solar inverter
status is Shutdown: Command, choose Device Commissioning > Maintenance >
Inverter ON/OFF on the app and send a startup command.
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Issue 03 (2020-07-20)
Device Commissioning > Maintenance > Inverter ON/OFF on the app
and send a shutdown command. Set the DC switch to OFF. Go to
to check other PV strings. Then go to
– If the Low Insulation Resistance alarm is still reported one minute after
the DC is supplied, go to
If not, go to Step 5.
If the Low Insulation Resistance alarm is not reported one minute after the
DC is supplied, the fault occurs on the disconnected PV module and optimizer.
Choose Device Commissioning > Maintenance > Inverter ON/OFF on the
app and send a shutdown command. Go to
If the Low Insulation Resistance alarm is still reported one minute after the
DC is supplied, the fault does not occur on the disconnected PV module or
optimizer. Go to Step
Step 5 to check the adjacent PV modules and optimizers.
Disconnect the possible faulty PV module from the optimizer.
Set the DC switch to OFF.
Connect the possible faulty optimizer to the PV string.
Set the DC switch to ON. If the solar inverter status is Shutdown: Command,
choose Device Commissioning > Maintenance > Inverter ON/OFF on the
app and send a startup command. Check whether the Low Insulation
Resistance alarm is reported.
– If the Low Insulation Resistance alarm is not reported one minute after
the solar inverter is powered on, the PV module is faulty. Choose Device
Commissioning > Maintenance > Inverter ON/OFF on the app and send
a shutdown command.
– If the Low Insulation Resistance alarm is still reported one minute after
the solar inverter is powered on, the optimizer is faulty.
Set the DC switch to OFF. Replace the faulty component to rectify the
insulation resistance fault. Go to
Step 8.
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E Locating Insulation Resistance Faults
Step
Step 5.
6.
Step 2 to check other PV strings. Then go to
8.
Step 7.
Step 2
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