Huawei SUN2000-28KTL User Manual page 57

SUN2000 (8KTL-28KTL)
User Manual
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Context
Figure 5-16
Figure 5-16 MPPT distribution
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Table 5-2
Issue 12 (2019-06-30)
If the SUN2000 is directly connected to the power grid and no three-phase four-wire
isolation transformer is connected to the output side, ensure that the PV strings are not
grounded.
If the DC voltage is a stable non-zero value between the positive terminal of a PV string
and the ground, the PV string has an insulation fault. Rectify the fault before connecting
cables.
During PV string and SUN2000 installation, 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.
If the PV strings need to be grounded, install a three-phase four-wire isolation transformer
on the output side and set the parameter of Isolation to Input Grounded, With TF by
following the instructions in
transformer is connected, the SUN2000 will not operate properly.
shows the MPPT distribution of the SUN2000.
The SUN2000-8KTL to SUN2000-12KTL provide two MPPT routes to track the
maximum power point for PV strings. Therefore, two to four DC inputs should be evenly
distributed on two terminal groups.
The SUN2000-15KTL to SUN2000-28KTL provide three MPPT routes to track the
maximum power point for PV strings. Therefore, two to six DC inputs should be evenly
distributed on three terminal groups.
describes the recommended DC input cable specifications.
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7.2.11 Setting Isolation
5 Electrical Connections
Parameters. If no isolation
50