Procedure
Step 1 Wear proper PPE.
Step 2 If the SUN2000 does not shut down due to a fault, send a shutdown command on
the app, SmartLogger, or management system. If the SUN2000 has shut down due
to a fault, go to the next step.
Step 3 Turn
o the AC switch between the SUN2000 and the power grid.
Step 4 Use a clamp meter to measure the DC current of each PV string input to the
SUN2000.
● If PV strings have no current, go to the next step.
● If a PV string has current, wait until the solar irradiance decreases and the PV
string has no current at night, and then go to the next step.
Step 5 Open the maintenance compartment door, install a support strut, and use a
multimeter to check the voltage between the AC terminal block and the ground.
Ensure that the AC side of the SUN2000 is powered
o.
Step 6 Turn o all DC input switches of the SUN2000 and ensure that all switches are
OFF. If the DC switches are automatically turned o, go to the next step.
Step 7 Wait for 15 minutes and troubleshoot or repair the SUN2000.
● Do not open the panel for maintenance if the SUN2000 is emitting abnormal
smell or smoke, or has obvious exceptions.
● If the SUN2000 does not emit abnormal smell or smoke and is intact, repair or
restart it based on the alarm handling suggestions. Do not stand in front of the
SUN2000 during the restart.
Figure 8-2 Power-o for maintenance
----End
SUN2000-(250KTL, 280KTL, 300KTL, 330KTL) Series
User Manual 8 System Maintenance
Issue 07 (2023-06-30) Copyright © Huawei Technologies Co., Ltd. 77
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