Connection Of The Pv Array Grounding Kit [Optional]; Units Connected To Independent Transformer Windings; Units Connected To The Same Transformer Windings; Two Units Connected To The Same Transformer Winding - Ingeteam INGECON SUN PowerMax TL U B 1000 Vdc Series Installation And Operation Manual

Connection of the PV array grounding kit [optional]

10. Connection of the PV array grounding kit [optional]
INFO
To find the different components listed below, consult Section "2.6. Location of components".
Refer to Section "Important safety instructions" and the safety paragraph in this section before operating the
equipment.
This kit enables the grounding of the negative pole of the PV array, depending on the technology of the panels used
or the applicable standard. The ground connection of the PV array is made via a 5 A fuse in accordance to the
standard UL1741.
If the inverters are connected to independent windings, the grounding for each of them is independent (standard
configuration). The grounding of inverters connected to the same transformer winding must be shared and unique,
as otherwise there could be current flowing between the different ground connections, so additional wiring is
required.
The different types of connection are explained below.

10.1. Units connected to independent transformer windings

If the inverter or inverters are connected to independent windings (galvanically insulated from each other), their
grounding must be independent, therefore no additional wiring is required between the units.

10.2. Units connected to the same transformer windings

To perform this ground connection, one of the inverters connected to the transformer winding must have the
grounding kit (-TSGND).
For a single ground connection, the grounded poles are connected between all the inverters and are grounded at a
single common point.
The connection of the grounded poles of the inverters must be done using a copper or aluminum wire of 35 mm
50 mm and at least 1000 V insulation (not supplied by Ingeteam) and fuses (supplied by Ingeteam). The purpose
2
of these fuses is not to protect the ground connection but to offer the installer the possibility of insulating the units
in a simple way in order to carry out maintenance tasks.
When operating, the inverters behave as completely independent units.
It is important to distinguish two scenarios:
•

Two units connected to the same transformer winding.

• Three units connected to the same transformer winding.
10.2.1. Two units connected to the same transformer winding
When connecting two units to the same transformer winding, the grounding of the system must be unique and
shared, as otherwise there could be currents flowing through the different ground connections.
Each inverter will be equipped with the following elements to carry out the configuration:
• One independent input with 1500 V fuse to connect the grounded fuses.
• One CAN communication cable for connecting the communications of both inverters.
Once the units have been installed, the following connections are performed:
ABK2027IQE01_A - Installation and Operation Manual
Ingeteam
to
2
75