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000969AG
5 - Installation
C
haracteristics 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 AC connection busbar
21
using
a cable lug (not supplied) of a suitable size for installation on the M10
screw used for securing the cable.
Single core cable
Multi-core cable
Cable diameter range
19 - 28 mm
37 - 53 mm
Voltage/current rating
50 mm²
Cable lug dimensioning
b a
for M10 Stud
a = 10.5 mm (min)
b = 40 mm (max)
The AC connection busbars
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are in copper tin-plated; therefore if aluminum cables are used,
the correct coupling with the copper bars must be guaranteed by using appropriate bi-metallic
cable lug.
L
oad protection switch (AC disconnect switch)
To protect the AC connection line of the inverter, an overcurrent
protection device with the following features must be installed (these are
the caracteristic of a load protection switch referred to a single inverter
installation):
PVS-100-TL
PVS-120-TL
Type Automatic circuit breaker with differential thermal-magnetic protection
Voltage/current rating
400 Vac / min. 150 A (*)
480 Vac / min. 150 A (*)
Magnetic protection characteristic
Magnetic curve B/C
Number of poles
3/4
(*): please consider thermal and other derating when selecting the current rating of the protection equipment
for your application.
