Step 4 Install a new inverter.
Step 5 Commission the inverter. For details, see 7 Power-On and Commissioning.
Step 6 Implement device replacement on the app.
1. Log in to the remote app and tap Devices on the home screen.
2. On the Devices screen, tap the name of the old device.
3. Tap :: in the upper right corner and tap Replace device.
4. On the Replace device screen, tap
to scan the QR code of the new device
or enter its SN.
5. Tap Replace.
----End
8.5 Locating Insulation Resistance Faults
If the ground resistance of a PV string connected to the inverter is too low, the
inverter generates a Low insulation resistance alarm. The alarm ID is 2062.
The possible causes are as follows:
● A short circuit has occurred 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.
After the Low insulation resistance alarm is reported by the inverter, insulation
resistance fault location is automatically triggered. If the fault location is
successful, the location information is displayed on the Alarm details screen of
the Low insulation resistance alarm on the FusionSolar app.
Log in to the FusionSolar app, choose Alarm > Active alarm, and choose Low
insulation resistance to enter the Alarm details screen.
● The positive and negative terminals of a PV string are connected to the PV+ and PV–
terminals of the inverter, respectively. The 0% position corresponds to the PV– terminal,
and the 100% position corresponds to the PV+ terminal. Other percentages indicate that
the fault occurs on a PV module or cable in the PV string.
● Possible fault position = Total number of PV modules in a PV string x Percentage of
possible short-circuit positions. For example, if a PV string consists of 14 PV modules
and the percentage of the possible short-circuit position is 34%, the possible fault
position is 4.76 (14 x 34%), indicating that the fault is located near PV module 4,
including the adjacent PV modules and their cables. The inverter has a detection
precision of ±1 PV module.
● MPPT1 that may be faulty corresponds to PV1 and MPPT2 that may be faulty
corresponds to PV2. The fault can be located only to the MPPT level. Perform the
following steps to connect the PV strings corresponding to the faulty MPPT to the
inverter one by one to further locate and rectify the fault.
● When a non-short-circuit fault occurs, the possible short-circuit percentage is not
displayed. If the insulation resistance is greater than 0.001 MΩ, the fault is not related
to short circuit. Check all PV modules in the faulty PV string one by one to locate and
rectify the fault.
SUN2000-(5K-12K)-MAP0 Series
User Manual 8 System Maintenance
Issue 01 (2024-05-13) Copyright © Huawei Digital Power Technologies Co., Ltd. 114
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