Huawei SUN2000-33KTL User Manual page 57

SUN2000-(33KTL, 40KTL)
User Manual
Ensure that the following conditions are met. Otherwise, the inverter will be damaged, or even
a fire disaster will be caused.




The PV strings must meet the following requirements if they need to be grounded:



Context

Issue 03 (2015-12-01)
The maximum open-circuit voltage of each PV string must be always lower than or equal
to 1000 V DC.
The positive and negative terminals of PV modules must be connected to the positive and
negative DC input terminals of the SUN2000 respectively.
If the SUN2000 is directly connected to the power grid with the neutral wire connected to
the PGND cable (for example, a low-voltage power grid or a power grid with the neutral
wire grounded), do not ground the positive and negative terminals of PV strings.
Otherwise, the SUN2000 will fail to work.
During the installation of PV strings and SUN2000, the positive or negative terminals of
PV strings may be grounded if power cables are not properly installed or routed. In this
case, an AC or DC short circuit may occur and damage the SUN2000.
Connect a three-phase isolation transformer on the output side, and ensure that the neutral
wire of the isolation transformer is separate from the PGND cable.
One isolation transformer must be installed only for one SUN2000. Do not connect two or
more SUN2000s to the same isolation transformer. Otherwise, the SUN2000s may fail to
work due to the loop current generated between them.
Set Isolation to Input Grounded, With TF on the SUN2000 APP, SmartLogger, or NMS.
DC terminal selection
Figure 5-11 shows the DC terminals at the bottom of the SUN2000.
the requirements for DC terminal selection.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5 Electrical Connections
Table 5-2 describes
51