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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
Connecting the DC input power cables
Describes the connection of the photovoltaic strings to the inverter using the DC power cables.
Connecting the AC output power cables
Describes the connection of the inverter to the AC grid using the AC power cables (following the granting of
the grid connection by the distributor).
Connecting the communication cables
Describes the function of the RS485 ports and the Wi-Fi board and the relative connection methods.
4.1.
Electrical connections
Figure 17 – Steps for connecting the cables
4.2.
Connecting PNGD cables (grounding)
Connect the 3PH 20000TL - 33000TL-V2 inverter to the ground electrode using ground protection cables
(PGND).
The inverter does not have a transformer, therefore the positive and negative
polarities of the photovoltaic string do NOT need to be grounded. Otherwise,
the inverter may fail. All non-current-carrying metal parts (such as the PV
module frame, PV rack, housing of the combiner box, and housing of the
inverter) in the PV power system must be connected to the ground.
Attention
Note
: Connect the PGND cable before connecting the AC, DC power and communication cables.
For systems with one inverter, connect the PGND cable to the ground. For systems with multiple inverters,
connect the PGND cables of each inverter to the ground electrode using equipotential connections.
