Huawei SUN2000-2KTL-L1 User Manual page 111

SUN2000-(2KTL-5KTL)-L1
User Manual
Step 4 Power off the solar inverter and check whether the connector or DC cable between the
possible faulty PV modules and the corresponding optimizers, or those between the adjacent
PV modules and the corresponding optimizers are damaged.
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Step 5 Power off the solar inverter, 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. Power on the solar inverter and view the alarm
information.
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Step 6 Power off the solar inverter, reconnect the removed PV module and optimizer, and repeat
Step 5
Step 7 Determine the position of the ground insulation fault.
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4.
5.
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Issue 01 (2020-04-17)
If yes, replace the damaged connector or DC cable, power on the solar inverter, and view
the alarm information.
− If the Low Insulation Resistance alarm is not reported one minute after the solar
inverter is powered on, the inspection on the PV string is complete. Go to
check other PV strings.
− If the Low Insulation Resistance alarm is still reported one minute after the solar
inverter is powered on, go to
If not, go to Step 5.
If the Low Insulation Resistance alarm is not reported one minute after the solar
inverter is powered on, the fault occurs on the disconnected PV module and optimizer.
Go to Step 7.
If the Low Insulation Resistance alarm is still reported one minute after the solar
inverter is powered on, the fault does not occur on the disconnected PV module or
optimizer. Go to Step 6.
to check the adjacent PV modules and optimizers.
Disconnect the possible faulty PV module from the optimizer.
Power off the solar inverter.
Connect the possible faulty optimizer to the PV string.
Power on the solar inverter. 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.
− If the Low Insulation Resistance alarm is still reported one minute after the solar
inverter is powered on, the optimizer is faulty.
Replace the faulty component to rectify the insulation resistance fault.
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E Locating Insulation Resistance Faults
Step 5.
Step 2 to
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