ABB UNO-DM-2.0-TL-PLUS Manual page 67

If any string inputs are not required, you must ensure that covers are installed to the connec-
tors, and install any which are missing.
This is necessary both for the inverter seal, and to avoid damage to the free connector which
IP65
may be used at a later time.
Connect all the strings required by the system, always checking the seal
of the connectors.
The figure below shows a connection example of the string inputs on a
UNO-DM-3.3-TL-PLUS-SB inverter.
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5 - Installation