When LED2 is steady green (meaning that the inverter is grid-tied), do not turn on
any DC switch. Otherwise, the inverter may be damaged because the insulation
resistance is not detected.
● Before turning on the AC switch between the SUN2000 and the power grid, use
a multimeter set to the AC position to check that the AC voltage is within the
specied range.
● Do not turn the DC switch to the unloaded position .
● When the system is powered on or running, do not place obstacles (such as
cables) to block the rotation of the handle or manually hold the handle.
Otherwise, the DC switch cannot be automatically disconnected.
● If the solar inverter has been stored for more than two years, it must be
checked and tested by professionals before being put into use.
Procedure
Step 1 Turn on the AC switch between the SUN2000 and the power grid.
If you perform Step 3 before Step 1, the SUN2000 reports a fault about abnormal
shutdown. You can start the SUN2000 only after the fault is automatically
rectied.
Step 2 (Optional) Remove the screws that secure DC SWITCH 1, DC SWITCH 2, and DC
SWITCH 3. Store the screws properly for future power-o maintenance.
For the model used in Australia, perform this step based on the local standards.
Figure 6-1 Remove the screws
SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual 6 Commissioning
Issue 15 (2023-01-31) Copyright © Huawei Technologies Co., Ltd. 79
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