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electric shock.
An optimal earthing connection can withstand resist
surge discharges and improve EMI performance.
Attention
Inverters must be properly earthed.
For systems with a single inverter, the PE wire must be
earthed.
For a multi-inverter system, all PE cables from the
inverters must be connected to the same copper
earthing bar to ensure equipotential bonding.
Steps for connecting the terminal to earth:
The external earthing connection terminal is located on the
1.
lower right side of the inverter.
Fasten the earthing connection terminal to the PE cable with
2.
a suitable tool and lock the earthing connection terminal to
the earthing connection hole on the bottom right side of the
inverter, as shown in Fig. 36.
The cross-sectional area of the external earthing cable is
3.
4 mm
.
2
Fig. 36. Earthing terminal connection.
5.3.3. Solar field connection.
The following must be taken into account when making the
1.
electrical connections to the inverter:
Disconnect the AC switch on the grid side.
a.
The inverter's DC switch must be set to "OFF".
b.
To ensure that the best practices are followed, check that
c.
the photovoltaic panels connected in each string are of
the same model and specifications.
Check that the maximum output voltage of each
d.
photovoltaic string does not exceed the maximum voltage
specified in the technical characteristics table in section
"9. Technical features.".
Insert the relevant DC circuit breakers, according to the
e.
following Tab. 14.
74
Isolating
Model
switch
EQX2 4002-HT
EQX2 5002-HT
EQX2 6002-HT
Built into
the unit
EQX2 8002-HT
EQX2 10002-HT
EQX2 12002-HT
Tab. 14. DC circuit breakers.
DC connector assembly procedure.
2.
Select the suitable photovoltaic cable:
a.
Type of cable
General
Range (mm
photovoltaic
2,5 - 4,0
cable
Tab. 15. Selecting the photovoltaic cable.
Strip 7 mm of the insulation sleeve of the DC cable,
b.
as shown in Fig. 37.
Cable cross-section 2.5-4 mm
7 mm
Fig. 37. Wire end stripping.
Remove the connector from the accessory bag, as shown
c.
in Fig. 38.
Fig. 38. Disassembling the connector.
Insert the DC cable through the DC connector nut on the
d.
metal terminal and press the terminal with professional
crimping pliers (pull the cable to check that the terminal is
well connected to the cable), as shown in Fig. 39.
Overvoltage
circuit breaker
If lightning
rods are
If no
Fuses
installed
lightning
or there
rod is
is a high
installed
probability
of lightning
1000 Vdc
Type II
Type I+II 5
15 A
40 kA
kA 1000 Vdc
fuses
600 Vdc
Cross-section area
)
Recommended value (mm
)
2
2
4,0
2
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