Huawei SUN2000-30KTL-A User Manual page 58

SUN2000-(30KTL-A, 33KTL, 40KTL)
User Manual
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Ensure that the following conditions are met. Otherwise, the inverter will be damaged, or even
a fire disaster will be caused.
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Context
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Issue 04 (2016-06-20)
PV modules generate electric energy when exposed to sunlight and can create an electrical
shock hazard. Therefore, when connecting DC input power cables, shield the PV modules
with opaque cloth.
Before connecting DC input power cables, ensure that the voltage on the DC side is within
the safe range (lower than 60 V DC) and that the DC SWITCH on the SUN2000 is OFF.
Otherwise, high voltage may result in electric shock.
When the SUN2000 is grid-tied, it is not allowed to perform operations on the DC input
power cables, such as connecting or disconnecting a string or a module in a string.
Otherwise, electric shocks may occur.
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.
Ensure that the PV string is well insulated to the ground. 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 may be
damaged. The caused equipment damage is beyond the warranty scope.
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 PV strings must meet the following requirements if they need to be grounded:
 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
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5 Electrical Connections
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