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Identification: MD-AL-GI-00
Rev. 1.1 of 15/03/2021 - Application: GID
User’s Manual 3PH 20000TL - 33000TL-V2
Rev. 1.1 15/03/2021
Check the polarity of the PV string to ensure the correct connection of the cables
to the string.
Do not connect the positive or negative polarities of the PV string to the ground.
Note
Make sure that the following information is observed. Otherwise, there is a risk
of fire.
The modules connected in series in each string must have the same brand and
model.
The open-circuit voltage for each string must be less than or equal to 1000 V DC.
The short circuit current for each input must be less than or equal to 12 A DC
The output power for each PV string must be less than or equal to the maximum
input power allowable for 3PH 20000TL - 33000TL-V2 inverters.
The positive and negative terminals of the PV strings must be connected
respectively to the positive and negative inputs of the input terminal block.
Attention
Before connecting the power supply, be sure to disconnect the generator’s DC
switch. When exposed to the sun, the photovoltaic generator produces a voltage
that can be dangerous!
Before connecting the power supply, make sure that the voltage of the DC cables
is within the permissible operating range, below 60 V DC, and that the DC circuit
breaker switch is open. Otherwise, the high voltage may cause serious damage.
Danger
If the 3PH 20000TL - 33000TL-V2 inverter is connected directly to the grid, make
sure that the PV strings are not grounded.
If the DC voltage has a non-zero value between the positive terminal of the PV
strings and the ground, the PV strings are subject to insulation faults. Fix the
fault before connecting the cables.
If the photovoltaic string is to be grounded, installed a three-phase four-wire
insolation transformer on the output side and disable the ISO detection function,
with reference to related chapter “Insulation Resistance.” In the event of
grounding of the string, if an isolation transformer is not installed, the inverter
will be damaged.
Note
