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11. Backup cable and protection devices
Load protection breaker (AC disconnect switch) and cable sizing (BACKUP output)
To protect the AC connection for the the backup output of the in-
verter, we recommend installing a device for protection against over
current and leakage with the following characteristics:
ABB declares that the ABB transformerless inverters, in terms of
their construction, do not inject continuous ground fault currents
and therefore there is no requirement that the differential protection
installed downstream of the inverter be type B in accordance with
IEC 60755 / A 2.
Characteristics and sizing of the cable (BACKUP output)
Three-pole cable required. The cross-
section of the AC line conductor must be
sized in order to prevent unwanted discon-
nections of the inverter from the grid due
to high impedance of the line that connects
the inverter to the power supply point.
12. Backup output connection (AC)
Warning! Before performing any of the operations described below, ensure the AC line downstream the inverter has been correctly
disconnected
Warning! ABB inverters should be earthed (PE) via the terminal with the protective earth label
te cross-section of the conductor for the maximum ground fault current that the generating system might experience
The REACT2 system is equipped with an AC BACKUP output that can be activated in different 2 ways:
• Backup Mode: AUTO
Automatic activation in case of loss of main (blackout).
• Backup Mode: External Control
Is used for activating the output:
- External command/signal (Communication and control signal terminal block
The selection of the backup mode is performed during the commissioning wizard.
See the "REACT2-Backup output use" document on the ABB site for more information
To connect the BACKUP output of the inverter, 3 connections are necessary: ground, neutral and phase. In any case, connection of the
inverter to ground is mandatory.
• Install the filter (supplied with the inverter) on the internal side of AC output (BACKUP) cable gland
REACT2-UNO).
The installation is carried out:
-
a
position the filter on the internal side of the cable gland
-
Screw the filter on the thread of the cable gland
b
BATTERY
PV
COMM.
POWER
DC SWITCH
For all the models the connection is made with the AC output terminal block
• Strip 10mm of sheathing from the cables and then insert into the inverter the cable,
making it pass through the AC output (BACKUP) cable gland
meter of the cable accepted by the cable gland is from 10 to 17 mm².
• Connect on the AC output (BACKUP) screw terminal block
protect against contact marked by the symbol , the neutral cable (usually blue) to the terminal
marked by the letter N and the phase cable to the terminal marked by the screen-print L; eve-
ry individual terminal of the terminal block accepts a cable with maximum section of 4 mm² (It is
necessary to fix the AC cables to the terminal block with a tightening torque of at least 1,5 Nm).
16
• Once the connection to the terminal block has been made, firmly screw the cable gland (7.5 Nm tightening torque) and
check the tightness.
Type
Nominal Voltage
Nominal Current
Magnetic protection characteristic
Number of poles
Type of differential protection
Differential sensitivity
Cross-section of the
line conductor (mm²)
1.5
2.5
4
The values are calculated in nominal power conditions, taking into account:
1. a power loss of not more than 1% along the line.
2. copper cable, with HEPR rubber insulation, laid in free air
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• Insert the backup cable into the REACT2 using the AC output (BACKUP) cable gland
METER
(M25 with toroid) and make the connections to the AC output (BACKUP) screw terminal
block
.
42
BACKUP
GRID
Use a properly sized tripolar cable and check the tightness of the AC ou-
tput (BACKUP) cable gland
16
; the maximum dia-
42
the ground cable (yellow-green) to
- 15 -
Maximum length of the
line conductor (mt)
6 m
11 m
19 m
16
, terminal 1-3).
16
16
at the end of the installation.
.
42
REACT2-UNO-3.6/5.0
Automatic circuit breaker with differential
thermal magnetic protection
230 Vac
32 A
B/C
2
A/AC
30 mA
max 4 mm²
L
N
10 ÷ 17 mm
, using a cable with an appropria-
b
(side inside the
EN
a
16
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