Checking the correct polarity of the strings (-SX / -SY versions)
These operations are to be carried out using class “0” insulating gloves
The reverse polarity can cause severe damage.
Within the DC wiring box
02
installed in inverter models -SX/-SY there are
two boards on which the string fuses are installed:
- positive (+) side string fuses
10
.
- negative (-) side string fuses
22
.
The board installed horizontally on the bottom part of the DC wiring box
02
contains the safety fuses on the positive poles
10
of the strings connected
in input, whereas the board that is installed vertically houses the negative
string fuses
22
.
The string safety fuses are installed inside special positioners
that allow easy installation/removal, as well as providing
protection from involuntary contact while the inverter is being
installed.
In the -SX and -SY versions 24 or 32 fuses (2 fuses for each string)
are predisposed based on the type of wiring box; the series of 12 or 16
fuses on the positive pole (+) are already tted while the 12 or 16 fuses
to be tted on the negative pole (-) are supplied; each fuse or string is
associated with a green LED.
Procedure for checking the correct polarity of the strings
1. Turn the DC disconnect switch
14
to OFF
2. Connect the strings and check that the GREEN
LED corresponding to each negative fuse activates.
The string will turn out to be inverted if the green LED is off or, in some
circumstances, faintly on.
3. Once connected and after all the input strings have
been checked, install the negative fuses (supplied). This
operation MUST be carried out in safe conditions therefore:
Install the fuses using suitable protection (for example, class “0”
insulating gloves). Otherwise remove the strings connected in input,
install the fuses supplied and connect the strings which have been
checked.
4. Close the wiring box cover
08
.
5. Install the three conductive spring between the power module cover
and the DC wiring box cover, at the unpainted areas.
-SX -SY (DC)
22
10
19
19
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