Electrical Connection
SMA Solar Technology AG
24
SB3300TLHC-IEN094121
Installation Guide
5.5.1 Connection RS485, Radio Piggy-Back
This section describes the installation of the Piggy-Backs for the different Sunny Boy communication
systems: RS485 interface and Radio Piggy-Back. You can take the relevant SMA order numbers from
the section 12 ”Accessories” (page 39).
1. Open the Sunny Boy as described in section 7.1 ”Opening the Sunny Boy” (page 29).
2. Guide the PG screw fitting over the communication cable.
3. Thread the cable through one of the cable openings (A) on the Sunny Boy. Use one or two cable
openings, depending on the type of cable used. Use the right-hand housing feed-through for the
Radio Piggy-Back.
4. Screw the PG screw fitting onto the Sunny Boy.
5. Sheathe the cable inside the Sunny Boy using the silicone tube provided. The silicone tube is
imperative for safety reasons. The interface may not be commissioned without this silicone tube
(with the exception of the Radio Piggy-Back).
6. Lay the cable in area (B) as shown in the figure to the right.
7. Ground the cable shield at the PE connector (C) if the connection plan of the communication
device indicates this as necessary.
8. Connect the communication wires to the screw terminal strip (D) as described in the connection
plan of the communication device. Note down the connector color coding for the respective pin
numbers. Connecting the receiver incorrectly can damage the devices.
– Pin 2 color:
– Pin 3 color:
– Pin 5 color:
– Pin 7 color:
9. Connect the jumpers (E) if the connection plan of the communication device indicates this as
necessary. The table in section 5.5.2 ”Jumper Functions” (page 25) provides an overview of
the jumper functions.
NOTICE!
Electrostatic discharges can damage the Sunny Boy and the communication
interface!
Electrostatic discharges are an acute danger to the Sunny Boy and to the communication
interface.
• Ground yourself by touching PE before removing the communication interface from
the packaging, and before touching any components within the Sunny Boy.
Read the communication device manual before beginning installation work. Further wiring
details can be found there.
