ABB PVS-100 - Operations Preliminary to the Connection of the PV Generator; Checking of Leakage to Ground of the Photovoltaic Generator; Checking of Strings Voltage

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000836BG
5 - Installation
Operations preliminary to the connection of the PV generator
In order to safely perform the preliminary operations before the connection to the PV genera-
tor, the connection of the ground protection cable to the wiring box is mandatory.
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.
Refer to “Verication of ground leakage” chapter on this manual to know how to verify the lea-
kage to ground of the photovoltaic generator.
Checking of strings voltage
Measure the voltage present between positive and negative pole of each
string.
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).
Input voltages higher than the maximum value accepted by the inverter (see technical data
table) may occur the damage of the inverter.