Operations Preliminary To The Connection Of The Pv Generator; Checking Of Leakage To Ground Of The Photovoltaic Generator; Checking Of Strings Voltage; Checking The Correct Polarity Of The Strings - ABB PVS-50-TL Product Manual

O
perations preliminary to the connection of the PV generator
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.
C
hecking of strings voltage
Input voltages higher than the maximum value accepted by the inverter (see technical data
table) may occur the damage of the inverter.
C
hecking the correct polarity of the strings
In order to perform safely the preliminary operations before the connec-
tion to the PV generator it is needed that the inverter is connected to the
ground.
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 isolation 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.
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 wiring the strings, you must ensure that the voltage of each string
complies with the correct polarity using a voltmeter.
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5 - Installation