SMA SC 250U - Manual (Page 11)

SMA America, LLC 1 Notes on this manual
Installation Guide DISU_SCUS-IA-IUS111711 11
1 Notes on this manual
This manual describes the installation and the commissioning of the Disconnect Unit for Sunny Central
250U / 500U / 500HE-US/CA and Sunny Central CP. This manual does not cover any details
concerning PV modules. Information concerning the PV modules is available from the manufacturer of
the PV modules.
You can install the Disconnect Unit both right and left from the Sunny Central. All instructions in this
manual are explained for a right system. That means, that the Disconnect Unit will be installed on the
right side of the Sunny Central. A right system is recommended by SMA due to much shorter cable
lengths. If an installation of the Disconnect Unit is required on a left system, observe that all
connections are arranged opposite and that all instructions are carried out accordingly.
Keep this manual in a convenient place for future reference.
1.1 Target group
This manual is for qualified personnel only. Qualified personnel have received training and have
demonstrated skills and knowledge in the construction and operation of the device. Qualified
personnel are trained to deal with the dangers and hazards involved in installing electric devices.
1.2 Validity
This manual is valid for the Disconnect Unit for Sunny Central 250U / 500U / 500HE-US/CA and
Sunny Central CP.
1.3 Nomenclature
In this technical writing the Sunny Central 250U / 500U / 500HE-US/CA and Sunny Central CP are
referred to as ”Sunny Central”.
In this technical writing the Disconnect Unit for Sunny Central 250U / 500U / 500HE-US/CA and
Sunny Central CP is referred to as ”Disconnect Unit”.
In this technical writing SMA America Production, LLC and SMA Solar Technology Canada Inc. are
referred to in the following as SMA.
1.4 Differences between variants of the Disconnect Unit
The dimensions of the Disconnect Unit are adopted to the specific inverter. A Disconnect Unit for the
Sunny Central 250U/500U has a lower height than the Disconnect Unit for the Sunny Central
500HE-US/CA and for Sunny Central CP. Furthermore, you can order the Disconnect Unit in different
technical variants. These differences between the variants of the Disconnect Unit are described
explicitly in the relevant technical writing chapters.