Procedure
Step 1 Wear proper personal protective equipment (PPE).
Step 2 If the solar inverter is not shut down due to a fault, send a shutdown command
on the SUN2000 app, SmartLogger, or management system. If the solar inverter
has shut down due to a fault, go to the next step.
Step 3 Turn
o the AC switch between the solar inverter and the power grid.
Step 4 Measure the DC current of each PV input string using a clamp meter that is set to
the DC position.
● If the current is less than or equal to 0.5 A, go to the next step.
● If the current is higher than 0.5 A, wait until the solar irradiance decreases
and the PV string current decreases below 0.5 A at night, and then go to the
next step.
Step 5 Open the maintenance compartment door, install a support bar, and use a
multimeter to measure the voltage between the AC terminal block and the
ground. Ensure that the AC side of the solar inverter is disconnected.
Step 6 Turn
o all DC input switches of the solar inverter.
Figure 8-2 Power-o for maintenance
Step 7 Wait for 15 minutes and troubleshoot or repair the inverter.
● Do not open the host panel for maintenance if the solar inverter is emitting
odor or smoke, or has obvious exceptions.
● If the solar inverter does not emit odor or smoke and is intact, repair or restart
it based on the alarm handling suggestions. Do not stand in front of the solar
inverter during the restart.
----End
SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual 8 Maintenance
Issue 15 (2023-01-31) Copyright © Huawei Technologies Co., Ltd. 115
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