Huawei SUN2000L Series User Manual page 48

SUN2000L-(4.125KTL, 4.95KTL)-JP
User Manual
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Ensure that the following conditions are met. Otherwise, the SUN2000L will be damaged, or
even become a fire hazard.
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Context
Figure 5-10 DC input terminals
(1) The first set of DC input terminals
Issue 03 (2018-04-11)
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 on the SUN2000L is OFF. Failing to
do so may result in electric shocks.
When the SUN2000L is operating, it is not allowed to work on DC circuit, such as
connecting or disconnecting a PV string or a PV module in a PV string. Failing to do so
may cause electric shocks.
The open-circuit voltage of each PV string is always lower than or equal to 600 V DC.
The positive and negative terminals of a PV string connect to corresponding positive and
negative DC input terminals of the SUN2000L.
If polarity of the DC input power cable is reversed and the DC switch is ON, do not turn
off the DC switch immediately or unplug 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 off the DC switch and remove the positive and negative connectors. Correct the
string polarity before reconnecting the string to the SUN2000L.
Since the output of the PV string connected to the SUN2000L cannot be grounded, ensure
that the PV module output is well insulated to ground.
During the installation of PV strings and SUN2000L, the positive or negative terminals of
PV strings may be short-circuited to ground if power cables are not properly installed or
routed. In this case, an AC or DC short circuit may occur and damage the SUN2000L. This
damage is not covered under any warranty or service agreement.
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5 Electrical Connections
(2) The second set of DC input terminals
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