Huawei SUN2000-33KTL-US User Manual page 69

SUN2000-(33KTL, 36KTL, 40KTL)-US
User Manual
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Ensure that the following conditions are met. Otherwise, the SUN2000 will be damaged, or
even a fire disaster will be caused.
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Context
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Issue 07 (2019-06-20)
Before connecting DC input power cables, ensure that the DC voltage is within the safe
range (lower than 60 V DC) and that the two DC switches on the SUN2000 are OFF.
Otherwise, the high voltage may result in electric shocks.
When the SUN2000 is grid-tied, it is not allowed to maintain DC input power cables, such
as connect or disconnect a string or a module in a string. Otherwise, electric shocks may
occur.
The highest open-circuit voltage of each PV string is always lower than or equal to 1000 V
DC.
The positive and negative terminals of a PV module connect to the positive and negative
DC input terminals of the SUN2000 respectively.
If the DC input power cable is reversely connected, do not operate the DC switches and
positive and negative connectors immediately. Wait until the solar irradiance declines at
night and the PV string current reduces to below 0.5 A. Then, turn off the two DC switches,
remove the positive and negative connectors, and correct the polarity of the DC input
power cable.
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.
DC terminal selection
Figure 5-26 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 fourth sets of DC input terminals, whereas DC SWITCH 2 controls the fifth to eighth
sets of DC input terminals.
Copyright © Huawei Technologies Co., Ltd.
5 Connecting Cables
Table 5-3 describes
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