EN
39
5.4.3 Characteristics and sizing of the
protective grounding cable
FIMER 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.
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 earth connection can be made:
• On the Protective Earth (PE) external connection point
(04)
.
WARNING –
B
The cross section of the protective earthing
conductor must have same cross section as the phases
cables and its minimum must be 10 mm
2
(Copper wire).
• On both Protective Earth (PE) external connection point
(04)
and on the AC quick fit connector
(09)
using cables having same
cross section as the phases cables.
ATTENTION –
A
Installation of a second protective earth
cable is also required by regulations in force in certain
countries of installation.
WARNING –
B
The PE connection point on the AC quick fit
connector
(09)
cannot substitute the Protective Earth (PE)
external connection point
(04)
.
5.4.4 Characteristics and sizing of the line
cable
The cross-section of the AC line conductor cables must be sized
in order to prevent unwanted disconnections of the inverter from
the grid due to high impedance of the line that connects the
inverter to the power supply; If the impedance is too high it causes
an increase in the AC voltage which, on reaching the limit set by
the standards in the country of installation, causes the inverter to
switch off.
The AC cables must be connected to the AC output connector
(17)
using the specific AC quick fit connector
(09)
supplied.
Conductor cable
Cable diameter
range
• 11...19 mm or 19...26mm based on the type
of seals installed
Conductor cross
section
• 6mm
2
...16mm
2
(with plastic collar ferrule)
accepted by the AC quick fit connector.
NOTE –
D
If is necessary to install a PE
cable cross section greater than 16mm
2
can be used the Protective Earth (PE)
external connection point
(04)
Conductor
material
copper
The table shows the maximum line conductor length in relation to
the section of the conductor itself:
Line conductor
cross section
(mm
2
)
Line conductor maximum length (m)
PVS-10-TL
PVS-12.5-TL PVS-15-TL
4
25
21
18
6
45
36
30
10
82
65
55
16
135
110
90
The values are calculated in nominal power conditions,
considering:
- loss of power along the line no greater than 1%
- use of copper cable, with HEPR rubber isolation and positioned
in open air.
5.4.5 Connection of the PE cable on the
Protective earth external connection
point
The inverter must be connecter to PE on the Protective earth (PE)
external connection point
(04)
(metal frame of the inverter).
ATTENTION –
A
In some countries of installation, two PE
cable are required for the inverter. In this case, use both PE
connection point of the inverter:
- Protective earth (PE) external connection point
(04)
- PE screw terminal on the AC quick fit connector
(09)
Both cables must have the same cross section as the
phases cables.
Click
Click
04
09
• Strip the cable.
• Install M6 cable lug on the earth cable.
• Install the earth cable on the Protective earth (PE) external
connection point
(04)
following the installation sequence (see
paragraph “3.5.2 Tightening torques”):
- Serrated washer
- Earth cable
- Serrated washer
- M6 screw