66 Product manual - PVS-175-TL;A.1 Version
EN
5.6 Grid output connection (AC side)
WARNING – B To avoid risks of electrical shock, all wiring operations must be carried out with
the disconnect switch downstream of the inverter (grid side) opened and applying LOTO
procedure on it. Be careful not to mistakenly exchange the phases with neutral!
The inverter must be connected to a three-phase TN system with the center of the star connected to
ground. To connect the inverter to the grid it is necessary to use a three-wire connection (3 phases)
without neutral cable.
ATTENTION – A In any case, the inverter’s earth connection is mandatory
The connections can also be made with the wiring box detached from the power module which can be
connected later for commissioning.
ATTENTION – A When working with the wiring box detached, (pay particular attention to
outdoor installations) always protect the top of wiring box with proper IP65 protection covers
(optional accessory content in the “PVS-175 Installation KIT”, to be ordered separately) on
the housing. Refer to the dedicated “Installations of IP65 protection covers for wiring box
openings” paragraph for further information about the installation procedure.
5.6.1 Characteristics and sizing of the protective grounding cable
ABB inverters must be earthed via the connection points marked with the protective earth symbol and
using a cable with an appropriate conductor cross-section for the maximum ground fault current that the
generating system might experience.
According to IEC 62109-1: If the external Protective earthing conductor cross-section area is S/2, where S
is the cross-section of the phase conductor, no further calculation are needed to demonstrate that the
cross-section is enough to sustain the fault current. Otherwise the protective earthing conductor cross-
section shall be determined by calculation according to IEC 60364-5-54 or have to fulfill the requirement
of local standard.
ATTENTION – A Any failure of the inverter when it is not connected to earth through the
appropriate connection point is not covered by the warranty.
The ground connection can be made through the Protective earth point (int.) (28), Protective earth point
(ext.) (10) or both (this is required by regulations in force in certain countries of installation).
The sizing of the ground cable also depend on the choice of the protective earth point (internal (28) or
external (10)) where it will be connected:
Protective earth point (int.) (28) Protective earth point (ext.) (10)
Cable diameter range
18 - 25 mm -
Max. conductor cross section
185 mm² copper
240 mm² aluminium
-
Cable lug dimensioning
b
a
for M10 Stud
a = 10.5 mm (min)
b = 40 mm (max)
for M8 Bolt
a = 8.4 mm (min) - 8.5 mm
(max)\
b = all dimension accepted
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