SMA
Technologie AG
Electrical Connection
Installation manual
SC-100-13:SE2407
Page 31
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.
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“.
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 3 4 5 6
Z9-X9
L+
L+
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
www.SMA.de
Sunny
Central
Central
Sunny
Control
ENTER
ESC
