Huawei SUN2000-50KTL-ZHM3 - Installing the DC Input Power Cable

5.5 Installing the DC Input Power Cable
Precautions
D ANGER
● Before connecting the DC input power cables, ensure that the DC voltage is
within the safe range (lower than 60 V DC) and that the DC switch on the
SUN2000 is OFF. Failing to do so may result in electric shocks.
● When the SUN2000 is running, it is not allowed to work on the DC input power
cables, such as connecting or disconnecting a PV string or a PV module in a PV
string. Failing to do so may cause electric shocks.
● If no PV string connects to a DC input terminal of the SUN2000, do not remove
the watertight cap from the DC input terminals. Otherwise, the IP rating of the
SUN2000 will be
aected.
WARNING
Ensure that the following conditions are met. Otherwise, the SUN2000 may be
damaged, or even a re could happen.
● PV modules connected in series in each PV string are of the same specications.
● According to IEC 62548, the maximum open-circuit voltage of each PV string
cannot exceed 1100 V DC at the lowest average annual dry-bulb temperature.
● The polarities of electric connections are correct on the DC input side. The
positive and negative terminals of a PV string connect to corresponding positive
and negative DC input terminals of the SUN2000.
● If polarity of the DC input power cable is reversed and the DC switch is ON, do
not turn
o the DC switch immediately or remove positive and negative
connectors. Wait until the solar irradiance declines at night and the PV string
current reduces to below 0.5 A, and then turn
o the DC switch and remove
the positive and negative connectors. Correct the PV string polarity before
reconnecting the PV string to the SUN2000.
NO TICE
● The SUN2000 does not support power supplies other than PV strings. Since the
output of the PV string connected to the SUN2000 cannot be grounded, ensure
that the PV module output is well insulated to ground.
● During the installation of PV strings and the SUN2000, the positive or negative
terminals of PV strings may be short-circuited to ground if the power cable is
not properly installed or routed. In this case, an AC or DC short circuit may
occur and damage the SUN2000. The caused device damage is not covered
under any warranty.
SUN2000-(50KTL-ZHM3, 50KTL-M3)
User Manual 5 Electrical Connections
Issue 05 (2023-02-28) Copyright © Huawei Technologies Co., Ltd. 44