Procedure
Step 1 Prepare the DC input power cables.
Step 2 Crimp positive and negative metal contacts.
Step 3 Insert the contacts into the corresponding positive and negative connectors.
Step 4 Tighten the lock nuts on the positive and negative connectors.
Step 5 Use a multimeter to measure the voltage between the positive and negative
terminals of the PV string (measurement range no less than 1100 V).
● If the voltage is a negative value, the DC input polarity is incorrect and needs
correction.
● If the voltage is greater than 1100 V, too many PV modules congured to the
same string. Remove some PV modules.
Step 6 Insert the positive and negative connectors into the corresponding DC positive and
negative input terminals of the solar inverter.
Figure 5-24 Connecting DC input power cables
If the DC input power cable is reversely connected and DC switches are set to ON,
do not immediately turn o the DC switches or reconnect the positive and
negative connectors. Otherwise, the device may be damaged. The caused device
damage is not covered under any warranty. Wait until the solar irradiance declines
at night and the PV string current reduces to below 0.5 A. Then, turn
o the three
DC switches, remove the positive and negative connectors, and rectify the
connection of the DC input power cable.
----End
SUN2000-(100KTL, 110KTL, 125KTL) Series
User Manual 5 Electrical Connections
Issue 07 (2020-09-15) Copyright © Huawei Technologies Co., Ltd. 65
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