Huawei SUN2000-33KTL-A User Manual page 58

SUN2000-(33KTL-A, 36KTL, 42KTL)
User Manual
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Context
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Table 5-3 DC terminal selection requirements
Number of Inputs
1
2
Issue 07 (2018-05-04)
Ensure that the PV module output is well insulated to ground. If the SUN2000 directly
connects to the power grid with the neutral wire connected to the PE 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. The device may be damaged if you do not
follow the instruction. This damage is not covered under any warranty or service
agreement.
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. The caused
equipment damage is beyond the warranty scope.
The following requirements must be met if the positive or negative terminals of PV strings need to be
grounded:
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A three-phase isolation transformer is installed on the output side.
 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 5-15 shows the DC terminals at the bottom of the SUN2000.
the requirements for DC terminal selection.
The SUN2000 provides two DC switches, namely, DC SWITCH 1 and DC SWITCH 2. DC SWITCH 1
controls the first to the fourth routes of DC input terminals, while DC SWITCH 2 controls the fifth to
the eighth routes of DC input terminals.
Figure 5-15 DC terminals
SUN2000
Connects to any route.
Connects to sets 1 and 5.
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5 Connecting Cables
Table 5-3 describes
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