ABB UNO-DM-TL-PLUS-US - Installation Planning; AC Overcurrent Protection; Grid Output Connection Type (AC Side)

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000719AG
5 - Installation
Installation planning
Always respect the nominal ratings of voltage, current, and power de-
ned in the technical data table, when designing your system.
Observe the following considerations in design:
To reduce the risk of re, connect only to a circuit provided with a branch circuit overcurrent
protection in accordance with NEC (ANSI/NFPA 70). See Maximum AC OCPD requirement
in following paragraph.
This UNO inverter is designed without an isolation transformer and is intended to be installed
per NFPA 70, 690.35 with an ungrounded PV array.
An automatic overcurrent device (e.g. circuit breaker) must be installed between the UNO
inverter and the AC utility grid. It is the responsibility of the end user to provide protection for
the AC output circuit.
AC overcurrent protection
AC output overcurrent protection is not provided in the inverter; it is the re-
sponsibility of the end user to provide overcurrent protection for the AC output
circuit. To reduce the risk of re, connect only to a dedicated circuit provided
with overcurrent protection in accordance with the NEC (ANSI/NFPA 70):
UNO-DM-3.3/3.8/4.6/5.0-TL-PLUS-US
Type Typical installations use a 2-pole/600V rated,
bi-directional thermal-magnetic circuit breaker, UL489 or equivalent.
Maximum Current/Voltage UNO-DM-3.3-TLPLUS → 20A/600V for 208V and 240V grid
UNO-DM-3.8-TLPLUS → 20A/600V for 208V and 240V grid
UNO-DM-4.6-TLPLUS → 25A/600V for 208V and 240V grid
UNO-DM-5.0-TLPLUS → 30A/600V for 208V and 240V grid
Choice of grid output connection type (AC side)
Determine which AC output is applicable for the inverter model being in-
stalled. The AC wiring connections based on the AC grid type are shown
in the table below.
208V~
3PH - 
240V~
SPLIT-PHASE
GRID STANDARD
TYPE DE RÉSEAU
TERMINAL
BORNE
WIRE
CÂBLE
L2
L1
N
L1
L3 L2
1
L1
2
L2
3
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CAUTION
Thisisasingle phase inverter. Use thewiringschemes shown on the
table below when adifferent grid standardis used. Refer to the
instruction manual to properly set theinvertergrid standard fromthe
front panel display. Use 90°C copper wire only. Refer to theinstruction
manual forwiringinstructions.
ATTENTION
Ceci est un onduleur monophasé.Utilisez lesschémas de raccordement
ci-dessussileréseau est spécifique.Réferez-vousau manuel
d'installation pour sélectionner via l'afficheur frontal le code pays
adéquat.Utilisez seulement câbles en cuivre90°C.
Consulterle manual d'installation pour lesinstructions de câblage.
AWG# 4 - 8
1
L1
2
L2
3
N
Caution! Connect the ground before the grid connections.