EN
65
5.10.2 Input connection on -S(X or Y) and S(X or
Y)2 models
WARNING –
B
Comply with the maximum input current
relating to the quick-fit connectors as indicated in the
technical data.
WARNING –
B
The reverse polarity can cause severe
damage and electric arc hazards! In case of reverse input
strings do not disconnect them while under load and do not
turn the DC disconnect switches
(15)
to OFF position. Wait
until input current are below 0.5A (when solar irradiance
declines at night) and turn the DC disconnect switches
(15)
to OFF position, disconnect the DC input quick fit connectors
(16)
and correct the wrong polarity of the string.
For the string connections on the -S(X or Y) and S(X or Y)2
versions, it is necessary to use the DC input quick fit connectors
(16)
, located on the left side of the wiring box.
The input connectors are divided into 6 groups (one group for each
input channel) consisting of 4 pairs of quick fit connectors.
PVS-100_120-TL_B2_S(X-Y)
6A
6B
6C
6D
5A
5B
5C
5D
3A
3B
3C
3D
4A
4B
4C
4D
2A
2B
2C
2D
1A
1B
1C
1D
16
These versions of inverter are equipped with 2 DC disconnect
switches
(15)
:
•
DC disconnect switches I → Groups 1, 2 and 3 of quick fit
connectors
•
DC disconnect switches II → Groups 4, 5 and 6 of quick fit
connectors
5.10.2.1 Sizing of fuses
Depending of the wiring box version installed on the inverter there
are different configuration of string fuses:
• SX, SY versions: equipped with positive side string fuses board
(19)
and have 24 string fuses (1 for each strings) that are supplied
and have to be installed.
• SX2, SY2 versions: equipped with both positive side string fuses
board
(19)
and negative side string fuses board
(20)
that totally
have 48 string fuses (2 for each strings). Fuses on the negative
side string fuses board
(20)
are already fitted while the fuses on
the positive side string fuses board
(19)
are supplied and have
to be installed.
PVS-100_120-TL_B2_S(X-Y)2
19
20
The correct sizing of the
(19)
positive side and
(20)
negative
side (-SX2, SY2 wiring box model) string fuses to be used to
protect from “return currents” is very important because it can
considerably limit the risk of fire and damage to the PV generator.
A “return current” can be generated in the event of a fault and
relevant short-circuit at the ends of one or more PV modules of
the system; this condition can cause all the current supplied by the
strings not involved in the fault, but connected to the same input
channel, to pass through the faulty string.
For input connectors marked with “
A
” and “
D
” you must directly
connect the individual strings coming into the inverter (do not make
field switchboards for parallel strings). This is because the positive
side
(19)
and negative side
(20)
string fuses, situated on each
input, are not rated to take strings in parallel (array).
This operation could damage the fuses and consequently could
cause malfunctioning of the inverter.
The connection in parallel of the strings (array composition) could
be made upstream of the input connectors marked with “
B
” and/
or “
C
” using a proper Y quick fit connector adapters: in this case
the input fuses will have to be replaced with a suitable size for the
paralleled strings.
CH1
CH2
CH3
CH4
CH5
CH6
1A
2A
1B
2B
1C
2C
1D
2D
3A
4A
3B
4B
3C
4C
3D
4D
5A
6A
5B
6B
5C
6C
5D
6D
The sizing of the string fuses must be made taking into account the
2 following conditions:
1. The nominal current of the fuse (Irated) must not exceed the
maximum rating of the fuse to be used in series on the strings
(maximum series fuse rating), indicated in the technical data of
the PV modules in compliance with standard EC 61730-2:
Irated < Maximum series fuse rating
