Operations preliminary to the connection of the PV generator
In oder to perform safely the preliminary operations before the connec-
tion to the PV generator it is needed that the DC wiring box is connected
to the ground. Preliminary operations can be performed in two different
circumstances:
1. Inverter installed (power module and both the wiring boxes). In this
case check that the grounding connection in the wiring box is present
and that both the ground connection brackets
32
have been installed
correctly
2. DC wiring box disconnected from the inverter. In this case it is ne-
cessary a temporary grounding connection to be removed after the
complete installation of the inverter (power module and both the wiring
boxes) and after the connection of the grounding cable in the AC wi-
ring box and the installation of ground connection brackets
32
.
The temporary ground connection is made on additional hole on the
grounding bracket
32
.
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Use the M6 screw and washer (not supplied) to x the temporary earth cable
Checking of leakage to ground of the photovoltaic generator
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.
Do not connect the strings if a leakage to ground has been detected, as the inverter might
not connect to the grid.
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