SMA SC 100 Indoor Installation - Manual (Page 33)

SMA Solar Technology AG Electrical Connection
Installation Guide SC-100-IEN093231 33
7.1.7 Sunny String Monitor Communication Connection
The communication between the Sunny Central Control unit in the inverter and the Sunny String
Monitors equipped with integrated string current monitoring is conducted via RS485 data line. The
data cable is connected directly to the Hub in the Sunny Central and afterwards to the Sunny Central
Control, see figure 7.6
.
Figure 7.6: Connection of the data line to the Sunny Central
7.1.8 Lightning and / or Overvoltage Protection
The Sunny Central SC100 Outdoor is equipped with internal lightning and overvoltage protection. In
this case, the AC/DC connection and the RS485 interface for connecting the Sunny String Monitors
is protected. Optionally, the analog signal input of an external temperature sensor (see wiring
diagram) can also be protected against lightning and overvoltage.
If the control voltage is supplied by an external cable, the existing overvoltage protection must be
expanded. We therefore also recommend equipping the control voltage input with combined
overvoltage and lightning protection. This can be retrofitted as an option.
NOTICE!
First connect the Sunny String-Monitors to the data cable and after that the Sunny Central.
It is essential that you follow the instructions of the comprehensive description in the Sunny
String Monitor user manual provided and in the wiring help „Connection of the
communication in the SSM“.
Sunny Central 100
1 2 3 4 5 6 Z9-X9
L+
L+
Z2-X2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16
L-
L-
L-
1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8
L+
1 2
1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8
L-
1 2
Z1-X1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
L+
Sunny Central
String Monitor
Power Supply Unit / Hub
FUSE
L
L
N
N
NC
PE
PE AC
+55V SSM Power SCC
Data-
Data+
GND
GND
+55V
+55V SSM
RS485
OUT
RS485 IN
U1-A6
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