SMA WB 5000 Installation - Manual (Page 40)

Communication SMA Technology AG
Page 40 WB50_60-11:SE4005 Installation Guide
7.3 RS485 communication
RS485 is a standard for communicating with up to 50 Windy Boys over a total
distance of up to 1200 m. For RS485 communication, the following conditions must
be satisfied:
• All Windy Boys must be equipped on the lower side of the case with the cable
feed-through provided.
• All the Windy Boys must be equipped with an RS485 Piggy-Back. You require a
RS485 / RS232 converter in order to connect a PC. SMA recommends the i-7520
converter, which can be purchased from SMA. The SMA order code is
"RSU485“.
• The completely shielded cable (e.g. LiYCY), having a minimum of one set of
twisted-pair conductors, each with an impedance of 100 Ohms, must be used.
• The first and last Sunny Boy 3800 in the RS485 chain must be equipped with a
termination resistor.
The SMA order code for RS485 is "485PB-NR“.
Begin with the last Windy Boy in the communications chain (e.g. the Windy Boy at
the end of the RS485 cable).
1. On the Windy Boy 5000 / 6000, remove the screw fitting (PG dummy plug)
from the second feed-through hole in the case, next to the AC connection plug.
2. Mount the PG screw fitting, with two perforated cable feed-throughs, provided
in the RS485 kit in the now open hole in the case.
3. On the last Windy Boy, please only open one of the two perforated cable feed-
throughs, since the RS485 communication bus ends at this device and only one
cable will be fed into the device.
4. Feed the cables through the feed-throughs in the Windy Boy and strip the cables
about 1 cm from the feed-through. Tighten the screw fitting firmly.
5. Please insulate the individual conductors using the silicon tubes provided in the
accessories kit. Please insulate the shield conductor separately. Please clamp the
shield conductor onto the PE (protective earth) screw terminal of the inverter's
case.
6. Connect each conductor of one of the twisted pair cables to terminals 2 and 7.
Take note of which conductor is connected to which terminal.
7. Connect one (or both) of the conductors of the second twisted pair cable to
terminal 5. Take note of which conductor you have used.
8. If no further Windy Boys must be connected, proceed to step 12.
At present, the Sunny Boy Control and the Sunny Boy Control Plus can
communicate with up to 10 different models and a total of up to 50 SMA
inverters.