Huawei SUN2000 User Manual page 58

SUN2000 (8KTL-28KTL)
User Manual
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Context
Figure 5-16
Figure 5-16 MPPT distribution
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DC input cables with the specifications specified in
Issue 07 (2014-07-30)
PV modules connected in series in each PV array are of the same specifications.
The open-circuit voltage of each PV array is always lower than or equal to 1000 V DC.
The open-circuit voltage of each PV array is always lower than or equal to 23 A DC.
The positive and negative terminals of PV arrays connect to the positive and negative DC
input terminals respectively.
If the SUN2000 connects to the power grid directly, ensure that the PV arrays are not
grounded.
If the DC voltage is a non-zero value between the positive terminal of PV arrays and the
ground, the PV arrays are subject to insulation faults. Rectify the fault before connecting
cables.
During PV array and SUN2000 installation, the positive or negative terminals of PV arrays
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 arrays 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
referring to 7.2.11 Setting Isolation
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.
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Parameters. If no isolation transformer is connected,
Table 5-2 are recommended.
5 Electrical Connections
52