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O
perations preliminary to the connection of the PV generator
In order to safely perform the preliminary operations before the connection to the PV gene-
rator, the connection of the ground protection cable
C
hecking of leakage to ground of the photovoltaic generator
Do not connect the strings if a leakage to ground has been detected, as the inverter might not
connect to the grid.
Refer to "Verification of ground leakage" chapter on this manual to know how to verify the lea-
kage to ground of the photovoltaic generator.
C
hecking of string voltage
Input voltages higher than the maximum absolute value accepted by the inverter (see techni-
cal data table) may damage the equipment.
C
hecking the correct polarity of the strings
These activity is allowed ONLY with the appropriate PPE for carrying out this check (overall
resistant to electric arc, dielectric helmet with visor, insulating gloves class 0, Protective over-
glove in leather EN420 – EN388 , Safety shoes).
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
declines at night) and turn the DC disconnect switches
input quick fit connectors
Measure the voltage present between positive and negative pole of each
string with respect to ground.
If a voltage is measured between an input pole and ground, it may be that
there is a low insulation resistance of the photovoltaic generator and the
installer will have to carry out a check to solve the problem.
Measure the voltage present between positive and negative pole of each
string using suitable equipment (1500V rated voltmeter).
If the open circuit voltage of the string is near the maximum value ac-
cepted by the inverter, consider that low ambient temperatures cause an
increase in the string voltage (different according to the photovoltaic mo-
dule used). In this case it is necessary to carry out a check of the sizing of
the system and/or a check on the connections of the modules of the sy-
stem (e.g.: number of modules in series higher than the design number).
Before connecting any input strings to the DC input quick fit connectors
panel
the string polarity of each string have to be checked using sui-
17
table equipment (1500V rated voltmeter).
to OFF position. Wait until input current are below 0.5A (when solar irradiance
16
and correct the wrong polarity of the string.
17
/
to the wiring box
10
26
to OFF position, disconnect the DC
16
- 75 -
5 - Installation
is mandatory.
02
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