SMA SC 100LV-560HE - Manual (Page 50)

Electrical Connection SMA Solar Technology AG
50 SC125_560HE-IEN083220 Installation Guide
5.2.2 AC grid connection of HE versions
The Sunny Central HE series is designed for grid connection through a medium-voltage transformer.
The medium-voltage transformer is realized depending on the project. The form of grid connection of
the inverter is IT grid. That means: the grid between the inverters and the medium-voltage transformer
is not grounded. The connection is 3-phased with the following operating voltage:
V: nominal voltage between the external conductor: depending on the device type 270 V
(315 V with Sunny Central 560)
Vo: Nominal voltage between external conductor and ground: 1000 V (depending on the current
operation of the device)
The connection of one fuse load break switch in the AC cabinet of the inverter to the low voltage
winding of a medium-voltage transformers is 3-phase.
Position of the AC connection terminals
Due to construction, the AC connection can vary. With the help of the equipment identifier
and the provided circuit diagram, the exact position of the AC connection terminals can be
determined.
WARNING!
Risk of death due to burns and electric shock when live parts are touched!
• Do not touch the live components of the Sunny Central or the public grid.
• All safety precaution measures regarding the public grid must be observed.
• Only work on this device when it is switched off and under voltage-free conditions.
ATTENTION!
High voltages in the IT grid.
Due to the IT grid, during inverter operation there are nominal voltages of up to 1000 V
between the external conductor and ground.
• When choosing the AC cables, take into account the increased demands on the
nominal voltage Vo against grounding.
ATTENTION!
Damage to the Sunny Central through faulty AC connection.
Dimensioning of the AC cables which have to be connected
• Lay the AC cables with a voltage resistance of minimum 1000 V.
• Lay the AC cables ground- and short-circuit proof.
• Only use aluminum cable clips (included in the delivery) for the cable clips of the AC
connection.