Wiring the Sunny Boy Communication Wiring
SB3000US-4000US-11-SE1607 SMA America 5-25
Connecting an RS-485 Cable
Use the following procedure to install an RS-485 data-communication network:
Note: The following steps describe how to connect one or
more Sunny Boy inverters to an RS-485 bus. For more
information on connecting more than one inverter to an RS-
485 bus, please see “Technical Note: RS-485
Communication” in the Tech Updates section of our web site
at www.sma-america.com
1. Connect the three wires of the RS-485 cable to terminals 2, 5, and 7 of the
communication terminal block as shown in Figure 5-13. Record the wire color
used for each of the terminals. Torque all wires to 15 in-lb (1.7 Nm).
Two communication knockouts are provided for connecting multiple Sunny
Boys on an RS-485 communication bus.
2. Connect the shield of the cable o the flat connection for grounding in the
Sunny Boy (for position see Figure 4-1). Do NOT connect the cable shield to
the PC’s DB-9 connector. The shield must remain floating at the PC.
3. Install a jumper in position A, the bottom set of pins on the communication
jumper block, to set it for termination. (See Figure 5-13)
Note: The termination of the other end of the RS-485 cable
will depend on what type of device you’re connecting to. For
detailed information, please see the Tech Updates section of
our web site at www.sma-america.com There you will find
technical information on all of the Sunny Boy communication
options.
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