Disconnection
Disconnection can be performed in reverse order.
5.5 Connecting the DC input power cable
Precautions
● Before connecting the DC input power cable, ensure that the DC voltage is
within the safe range (lower than 60 V DC), and that the DC SWITCH is set to
the OFF position. Failure to do so could generate high voltage, which may
cause electric shocks.
● When the SUN2000 is operating, it is not allowed to operate the DC input
power cable, 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 is connected to a DC input terminal of the SUN2000, do not
remove the watertight cap from the terminal. Otherwise, the IP rating of the
SUN2000 will be
aected.
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
specications.
● The open-circuit voltage of each PV string is always lower than or equal to
1080 V DC.
● The maximum short-circuit current of each PV string must be lower than or
equal to 15 A.
● The DC input power cable is correctly connected. The positive and negative
terminals of a PV module are connected to corresponding positive and negative
DC input terminals of the SUN2000.
● If the DC input power cable is reversely connected, do not operate the DC
switch and 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. Remove the positive and negative connectors to correct
the polarity.
SUN2000-(8KTL-20KTL)-M2
User Manual 5 Electrical Connections
Issue 11 (2023-02-07) Copyright © Huawei Technologies Co., Ltd. 48
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