Grid output connection (AC side)
For the connection of the inverter to the grid, you can choose between a
star connection (3 phases + neutral) and a delta connection (3 phases).
In any case, connection of the inverter to ground is mandatory.
The cable you use can be 5-pole (star conguration) or 4-pole (delta
conguration) and must pass through the AC cable gland
16
to make the
connections to the AC output terminal board
17
.
The connections can also be made with the wiring box
02
detached from
the inverter
03
that can be connected later to be put in service.
When working with the wiring box
02
detached, pay particular attention to outdoor installa-
tions, where the coupling connector must always be protected by installing the cover
04
on
its housing.
Characteristics and sizing of the protective earthing cable
ABB inverters must be earthed via the terminal with the protective earth
symbol ( ), using a cable with an appropriate conductor cross-section
for the maximum ground fault current that the generating system might
experience.
Any failure of the inverter when it is not connected to earth through the appropriate terminal is not
covered by the warranty.
In compliance with standard IEC 62109 it is necessary:
• To install a copper earthing cable on the AC output terminal block
17
with a minimum section of 10 mm
2
.
• Alternatively it is possible to install a second earthing cable (with the
same section as the one installed on the AC output terminal block
17
) on
the connection point located on the underside of the inverter and marked
with the symbol .
Installation of a second protective earthing cable is also required by regu-
lations in force in certain countries of installation.
If necessary, carefully read the instructions provided in the paragraph “Installation of the se-
cond protective earthing cable”.
17
16
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