SMA Technol ogie AG The Communication Interface
Installation Guide SMC50A_60A-IEN073320 Page 49
7.1 Connecting RS232, RS485, Sunny Beam
Electrostatic discharges are an acute danger to the Sunny Mini Central and to the
communications interface. Ground yourself by touching PE or a non-coated part
of the housing before removing the communication interface from the packaging,
and before touching any components within the Sunny Mini Central.
Read the communication device manual before beginning installation work.
Further wiring details can be found there.
Step Instruction
1Open the inverter as described in section 10.
2Guide the PG screw fitting over the communication cable.
3Thread the cable through the cable feed-through (A) on the Sunny Mini
Central.
4Screw the PG screw fitting onto the Sunny Mini Central.
5Sheathe the cable inside the Sunny Mini Central using the silicone tube
provided. The silicone tube is imperative for safety reasons. Without this
silicone tube, the interface may not be operated.
6Lay the cable in area (B) as shown in the figure to the right.
7Ground the cable shield at the PE connector (C) if the connection plan of the
communication device indicates this as necessary.
8Connect 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: ______________________
9Connect the jumpers (E) if the connection plan of the communication device
indicates this as necessary. The table shown to the right provides an
overview of the jumper functions.
10 Plug the communication interface to the left of the board (F).
11 Close the Sunny Mini Central as described in section 10.