E Locating Insulation Resistance Faults - Huawei SUN600-5KTL-L0 User Manual

SUN600-(5KTL, 6KTL)-L0
User Manual
E
Locating Insulation Resistance Faults
If the ground resistance of a PV string connected to a solar inverter is too low, the
solar inverter generates a Low Insulation Resistance alarm.
The possible causes are as follows:
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To locate the fault, connect each PV string to a solar inverter, power on and check
the solar inverter, and locate the fault based on the alarm information reported by
the FusionSolar app. Perform the following steps to locate an insulation resistance
fault.
If two or more ground insulation faults occur in a single PV string, the following
method cannot locate the fault. You need to check the PV modules one by one.
Step 1 The AC power supply is connected, and set the DC switch at the bottom of the
solar inverter to OFF.
Step 2 Connect each PV string to the solar inverter and 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.
Step 3 Log in to the FusionSolar app and choose My > Device Commissioning. On the
Device Commissioning screen, connect and log in to the solar inverter, and access
the Alarm management screen. Check whether the Low Insulation Resistance
alarm is reported.
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Issue 04 (2023-02-17)
A short circuit occurs between the PV array and the ground.
The ambient air of the PV array is damp and the insulation between the PV
array and the ground is poor.
NO TICE
If the Low Insulation Resistance alarm is not reported one minute after the
DC is supplied, choose Device Commissioning > Maintenance > Inverter
ON/OFF on the app and send a shutdown command. Set the DC switch to
OFF and go to Step 2
check.
If a Low Insulation Resistance alarm is still reported one minute after the
DC is supplied, check the percentage for possible short-circuit positions on the
Alarm details page and go to
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E Locating Insulation Resistance Faults

to connect another PV string to the solar inverter for a
Step 4.
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